LeetCode Interview Questions

Welcome to the LeetCode Interview Questions repository! In this repository, I solve various LeetCode interview questions using Python. Each file corresponds to a specific LeetCode problem, and within each file, you'll find a link to the original problem on LeetCode.

Roadmap and Solutions

For a comprehensive roadmap and solutions, including video explanations for each problem, check out neetcode.io. This website offers detailed explanations and solutions, along with accompanying videos, making it a valuable resource for interview preparation.

Additional Resources

• neetcode.io GitHub Repository: Explore over 2971 solved problems in Python on GitHub.
• NeetCode YouTube Channel: Watch video tutorials and explanations for various LeetCode problems and problem solving.

LeetCode Topics

Math

0066-plus-one
0067-add-binary
0166-fraction-to-recurring-decimal
0231-power-of-two
0326-power-of-three
0342-power-of-four
0679-24-game
0762-prime-number-of-set-bits-in-binary-representation
0797-rabbits-in-forest
0826-soup-servings
0830-largest-triangle-area
0840-magic-squares-in-grid
0867-new-21-game
0900-reordered-power-of-2
1015-smallest-integer-divisible-by-k
1018-largest-perimeter-triangle
1266-minimum-time-visiting-all-points
1390-four-divisors
1411-convert-binary-number-in-a-linked-list-to-integer
1421-find-numbers-with-even-number-of-digits
1426-find-n-unique-integers-sum-up-to-zero
1440-convert-integer-to-the-sum-of-two-no-zero-integers
1448-maximum-69-number
1500-count-largest-group
1523-count-odd-numbers-in-an-interval-range
1529-max-difference-you-can-get-from-changing-an-integer
1635-number-of-good-pairs
1636-number-of-substrings-with-only-1s
1642-water-bottles
1680-concatenation-of-consecutive-binary-numbers
1817-calculate-money-in-leetcode-bank
1925-count-square-sum-triples
2110-number-of-smooth-descent-periods-of-a-stock
2147-number-of-ways-to-divide-a-long-corridor
2174-next-greater-numerically-balanced-number
2202-sum-of-k-mirror-numbers
2244-number-of-laser-beams-in-a-bank
2288-count-operations-to-obtain-zero
2307-replace-non-coprime-numbers-in-array
2324-find-triangular-sum-of-an-array
2409-count-days-spent-together
2415-count-the-number-of-ideal-arrays
2432-number-of-zero-filled-subarrays
2661-smallest-missing-non-negative-integer-after-operations
2704-maximum-difference-by-remapping-a-digit
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
3047-find-the-largest-area-of-square-inside-two-rectangles
3172-divisible-and-non-divisible-sums-difference
3190-find-minimum-operations-to-make-all-elements-divisible-by-three
3201-distribute-candies-among-children-ii
3243-count-the-number-of-powerful-integers
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3279-alice-and-bob-playing-flower-game
3321-type-of-triangle
3336-water-bottles-ii
3432-count-partitions-with-even-sum-difference
3433-count-mentions-per-user
3462-vowels-game-in-a-string
3512-minimum-operations-to-make-array-sum-divisible-by-k
3577-count-the-number-of-computer-unlocking-permutations
3581-the-two-sneaky-numbers-of-digitville
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3666-minimum-operations-to-equalize-binary-string
3676-smallest-number-with-all-set-bits
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3744-minimum-operations-to-make-array-elements-zero
3754-maximum-manhattan-distance-after-k-changes
3768-check-if-digits-are-equal-in-string-after-operations-i
3830-find-closest-person
3851-find-sum-of-array-product-of-magical-sequences

String

0038-count-and-say
0049-group-anagrams
0067-add-binary
0165-compare-version-numbers
0166-fraction-to-recurring-decimal
0205-isomorphic-strings
0383-ransom-note
0474-ones-and-zeroes
0535-encode-and-decode-tinyurl
0696-count-binary-substrings
0712-minimum-ascii-delete-sum-for-two-strings
0756-pyramid-transition-matrix
0761-special-binary-string
0778-reorganize-string
0808-number-of-matching-subsequences
0868-push-dominoes
0944-delete-columns-to-make-sorted
0955-delete-columns-to-make-sorted-ii
0960-delete-columns-to-make-sorted-iii
1006-vowel-spellchecker
1058-lexicographically-smallest-equivalent-string
1264-maximum-number-of-words-you-can-type
1297-maximum-number-of-balloons
1302-delete-characters-to-make-fancy-string
1350-remove-sub-folders-from-the-filesystem
1353-find-resultant-array-after-removing-anagrams
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1461-check-if-a-string-contains-all-binary-codes-of-size-k
1537-maximum-score-after-splitting-a-string
1545-find-kth-bit-in-nth-binary-string
1632-number-of-good-ways-to-split-a-string
1636-number-of-substrings-with-only-1s
1653-minimum-deletions-to-make-string-balanced
1700-minimum-time-to-make-rope-colorful
1747-lexicographically-smallest-string-after-applying-operations
1818-maximum-score-from-removing-substrings
1930-unique-length-3-palindromic-subsequences
1980-find-unique-binary-string
2059-unique-length-3-palindromic-subsequences
2079-delete-duplicate-folders-in-system
2137-final-value-of-variable-after-performing-operations
2140-longest-subsequence-repeated-k-times
2147-number-of-ways-to-divide-a-long-corridor
2211-count-collisions-on-a-road
2237-longest-palindrome-by-concatenating-two-letter-words
2244-number-of-laser-beams-in-a-bank
2260-divide-a-string-into-groups-of-size-k
2346-largest-3-same-digit-number-in-string
2395-longest-binary-subsequence-less-than-or-equal-to-k
2409-count-days-spent-together
2429-design-a-food-rating-system
2483-minimum-penalty-for-a-shop
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2691-count-vowel-strings-in-ranges
2887-sort-vowels-in-a-string
2976-minimum-cost-to-convert-string-i
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3194-find-words-containing-character
3233-maximize-the-number-of-partitions-after-operations
3243-count-the-number-of-powerful-integers
3360-minimum-deletions-to-make-string-k-special
3396-valid-word
3445-lexicographically-minimum-string-after-removing-stars
3462-vowels-game-in-a-string
3479-count-the-number-of-substrings-with-dominant-ones
3493-maximum-number-of-operations-to-move-ones-to-the-end
3606-coupon-code-validator
3617-find-the-original-typed-string-i
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3666-minimum-operations-to-equalize-binary-string
3683-find-the-lexicographically-largest-string-from-the-box-i
3713-longest-balanced-substring-i
3714-longest-balanced-substring-ii
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3761-maximum-difference-between-even-and-odd-frequency-ii
3768-check-if-digits-are-equal-in-string-after-operations-i
3797-design-spreadsheet
3872-find-most-frequent-vowel-and-consonant

Dynamic Programming

0085-maximal-rectangle
0118-pascals-triangle
0120-triangle
0474-ones-and-zeroes
0712-minimum-ascii-delete-sum-for-two-strings
0799-champagne-tower
0806-domino-and-tromino-tiling
0808-number-of-matching-subsequences
0826-soup-servings
0867-new-21-game
0868-push-dominoes
0934-bitwise-ors-of-subarrays
0960-delete-columns-to-make-sorted-iii
1111-minimum-score-triangulation-of-polygon
1262-greatest-sum-divisible-by-three
1402-count-square-submatrices-with-all-ones
1411-number-of-ways-to-paint-n-3-grid
1458-max-dot-product-of-two-subsequences
1586-longest-subarray-of-1s-after-deleting-one-element
1628-count-submatrices-with-all-ones
1632-number-of-good-ways-to-split-a-string
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1653-minimum-deletions-to-make-string-balanced
1700-minimum-time-to-make-rope-colorful
1732-minimum-one-bit-operations-to-make-integers-zero
1851-maximum-number-of-events-that-can-be-attended-ii
1986-largest-color-value-in-a-directed-graph
2028-the-earliest-and-latest-rounds-where-players-compete
2054-two-best-non-overlapping-events
2061-painting-a-grid-with-three-different-colors
2110-number-of-smooth-descent-periods-of-a-stock
2147-number-of-ways-to-divide-a-long-corridor
2267-minimum-difference-in-sums-after-removal-of-elements
2395-longest-binary-subsequence-less-than-or-equal-to-k
2408-number-of-people-aware-of-a-secret
2415-count-the-number-of-ideal-arrays
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2882-ways-to-express-an-integer-as-sum-of-powers
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3233-maximize-the-number-of-partitions-after-operations
3243-count-the-number-of-powerful-integers
3307-find-the-maximum-sum-of-node-values
3437-maximum-total-damage-with-spell-casting
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3562-maximum-profit-from-trading-stocks-with-discounts
3573-best-time-to-buy-and-sell-stock-v
3578-count-partitions-with-max-min-difference-at-most-k
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3637-count-number-of-balanced-permutations
3640-trionic-array-ii
3648-find-the-maximum-number-of-fruits-collected
3651-minimum-cost-path-with-teleportations
3733-length-of-longest-v-shaped-diagonal-segment
3851-find-sum-of-array-product-of-magical-sequences
3882-minimum-xor-path-in-a-grid

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0036-valid-sudoku
0037-sudoku-solver
0049-group-anagrams
0066-plus-one
0073-set-matrix-zeroes
0075-sort-colors
0085-maximal-rectangle
0088-merge-sorted-array
0118-pascals-triangle
0120-triangle
0128-longest-consecutive-sequence
0135-candy
0219-contains-duplicate-ii
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0474-ones-and-zeroes
0498-diagonal-traverse
0594-longest-harmonious-subsequence
0611-valid-triangle-number
0659-split-array-into-consecutive-subsequences
0679-24-game
0717-1-bit-and-2-bit-characters
0759-set-intersection-size-at-least-two
0794-swim-in-rising-water
0797-rabbits-in-forest
0808-number-of-matching-subsequences
0817-design-hashmap
0830-largest-triangle-area
0840-magic-squares-in-grid
0934-bitwise-ors-of-subarrays
0940-fruit-into-baskets
0944-delete-columns-to-make-sorted
0945-snakes-and-ladders
0955-delete-columns-to-make-sorted-ii
0960-delete-columns-to-make-sorted-iii
0961-n-repeated-element-in-size-2n-array
1006-vowel-spellchecker
1018-largest-perimeter-triangle
1018-binary-prefix-divisible-by-5
1049-minimum-domino-rotations-for-equal-row
1111-minimum-score-triangulation-of-polygon
1200-minimum-absolute-difference
1227-number-of-equivalent-domino-pairs
1254-number-of-closed-islands
1262-greatest-sum-divisible-by-three
1266-minimum-time-visiting-all-points
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1293-three-consecutive-odds
1350-remove-sub-folders-from-the-filesystem
1351-count-negative-numbers-in-a-sorted-matrix
1353-find-resultant-array-after-removing-anagrams
1390-four-divisors
1402-count-square-submatrices-with-all-ones
1421-find-numbers-with-even-number-of-digits
1424-maximum-candies-you-can-get-from-boxes
1426-find-n-unique-integers-sum-up-to-zero
1458-max-dot-product-of-two-subsequences
1478-maximum-number-of-events-that-can-be-attended
1510-find-lucky-integer-in-an-array
1536-minimum-swaps-to-arrange-a-binary-grid
1548-check-if-all-1s-are-at-least-length-k-places-away
1586-longest-subarray-of-1s-after-deleting-one-element
1590-make-sum-divisible-by-p
1612-avoid-flood-in-the-city
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1628-count-submatrices-with-all-ones
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1635-number-of-good-pairs
1700-minimum-time-to-make-rope-colorful
1813-maximum-erasure-value
1834-minimum-number-of-people-to-teach
1851-maximum-number-of-events-that-can-be-attended-ii
1877-minimize-maximum-pair-sum-in-array
1895-largest-magic-square
1917-maximum-average-pass-ratio
1970-last-day-where-you-can-still-cross
1975-maximum-matrix-sum
1980-find-unique-binary-string
1984-minimum-difference-between-highest-and-lowest-of-k-scores
1995-finding-pairs-with-a-certain-sum
2023-design-movie-rental-system
2048-build-array-from-permutation
2054-two-best-non-overlapping-events
2079-delete-duplicate-folders-in-system
2110-number-of-smooth-descent-periods-of-a-stock
2137-final-value-of-variable-after-performing-operations
2141-maximum-running-time-of-n-computers
2144-maximum-difference-between-increasing-elements
2150-kth-smallest-product-of-two-sorted-arrays
2169-simple-bank-system
2170-count-number-of-maximum-bitwise-or-subsets
2180-maximum-number-of-tasks-you-can-assign
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2229-maximum-fruits-harvested-after-at-most-k-steps
2237-longest-palindrome-by-concatenating-two-letter-words
2244-number-of-laser-beams-in-a-bank
2249-count-the-hidden-sequences
2267-minimum-difference-in-sums-after-removal-of-elements
2274-keep-multiplying-found-values-by-two
2277-count-equal-and-divisible-pairs-in-an-array
2307-replace-non-coprime-numbers-in-array
2316-count-hills-and-valleys-in-an-array
2320-find-all-k-distant-indices-in-an-array
2324-find-triangular-sum-of-an-array
2343-count-unguarded-cells-in-the-grid
2358-number-of-ways-to-split-array
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
2394-count-subarrays-with-score-less-than-k
2400-minimum-score-after-removals-on-a-tree
2402-meeting-rooms-iii
2429-design-a-food-rating-system
2432-number-of-zero-filled-subarrays
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2527-count-subarrays-with-fixed-bounds
2529-range-product-queries-of-powers
2618-maximize-the-minimum-powered-city
2625-increment-submatrices-by-one
2661-smallest-missing-non-negative-integer-after-operations
2685-first-completely-painted-row-or-column
2689-rearranging-fruits
2691-count-vowel-strings-in-ranges
2699-count-the-number-of-fair-pairs
2720-minimize-the-maximum-difference-of-pairs
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
2856-count-complete-subarrays-in-an-array
2906-construct-product-matrix
2915-count-of-interesting-subarrays
2943-maximize-area-of-square-hole-in-grid
2975-maximum-square-area-by-removing-fences-from-a-field
2976-minimum-cost-to-convert-string-i
3047-find-the-largest-area-of-square-inside-two-rectangles
3074-apple-redistribution-into-boxes
3075-maximize-happiness-of-selected-children
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3190-find-minimum-operations-to-make-all-elements-divisible-by-three
3194-find-words-containing-character
3213-count-subarrays-where-max-element-appears-at-least-k-times
3241-divide-array-into-arrays-with-max-difference
3242-count-elements-with-maximum-frequency
3251-maximum-area-of-longest-diagonal-rectangle
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3307-find-the-maximum-sum-of-node-values
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii
3321-type-of-triangle
3379-transformed-array
3381-maximum-subarray-sum-with-length-divisible-by-k
3383-taking-maximum-energy-from-the-mystic-dungeon
3415-check-if-grid-satisfies-conditions
3432-count-partitions-with-even-sum-difference
3433-count-mentions-per-user
3437-maximum-total-damage-with-spell-casting
3453-separate-squares-i
3454-separate-squares-ii
3459-find-the-minimum-area-to-cover-all-ones-ii
3461-find-the-minimum-area-to-cover-all-ones-i
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3501-delete-nodes-from-linked-list-present-in-array
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3512-minimum-operations-to-make-array-sum-divisible-by-k
3531-count-covered-buildings
3546-equal-sum-grid-partition-i
3562-maximum-profit-from-trading-stocks-with-discounts
3573-best-time-to-buy-and-sell-stock-v
3577-count-the-number-of-computer-unlocking-permutations
3578-count-partitions-with-max-min-difference-at-most-k
3581-the-two-sneaky-numbers-of-digitville
3583-count-special-triplets
3592-find-x-sum-of-all-k-long-subarrays-ii
3606-coupon-code-validator
3610-find-x-sum-of-all-k-long-subarrays-i
3612-adjacent-increasing-subarrays-detection-i
3616-make-array-elements-equal-to-zero
3619-adjacent-increasing-subarrays-detection-ii
3619-count-islands-with-total-value-divisible-by-k
3620-maximum-number-of-distinct-elements-after-operations
3622-maximum-frequency-of-an-element-after-performing-operations-i
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3634-minimum-removals-to-balance-array
3635-earliest-finish-time-for-land-and-water-rides-ii
3639-zero-array-transformation-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3640-trionic-array-ii
3644-maximum-k-to-sort-a-permutation
3647-zero-array-transformation-iii
3648-find-the-maximum-number-of-fruits-collected
3651-minimum-cost-path-with-teleportations
3652-best-time-to-buy-and-sell-stock-using-strategy
3685-count-subarrays-of-length-three-with-a-condition
3719-longest-balanced-subarray-i
3721-longest-balanced-subarray-ii
3733-length-of-longest-v-shaped-diagonal-segment
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3744-minimum-operations-to-make-array-elements-zero
3747-maximum-difference-between-adjacent-elements-in-a-circular-array
3748-sort-matrix-by-diagonals
3788-maximum-unique-subarray-sum-after-deletion
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3794-find-the-minimum-amount-of-time-to-brew-potions
3797-design-spreadsheet
3827-implement-router
3834-minimum-operations-to-convert-all-elements-to-zero
3851-find-sum-of-array-product-of-magical-sequences
3863-power-grid-maintenance
3882-minimum-xor-path-in-a-grid

Hash Table

0001-two-sum
0036-valid-sudoku
0037-sudoku-solver
0049-group-anagrams
0073-set-matrix-zeroes
0128-longest-consecutive-sequence
0166-fraction-to-recurring-decimal
0205-isomorphic-strings
0219-contains-duplicate-ii
0383-ransom-note
0535-encode-and-decode-tinyurl
0594-longest-harmonious-subsequence
0659-split-array-into-consecutive-subsequences
0756-pyramid-transition-matrix
0778-reorganize-string
0797-rabbits-in-forest
0808-number-of-matching-subsequences
0817-design-hashmap
0840-magic-squares-in-grid
0865-smallest-subtree-with-all-the-deepest-nodes
0900-reordered-power-of-2
0940-fruit-into-baskets
0961-n-repeated-element-in-size-2n-array
1006-vowel-spellchecker
1015-smallest-integer-divisible-by-k
1227-number-of-equivalent-domino-pairs
1264-maximum-number-of-words-you-can-type
1297-maximum-number-of-balloons
1353-find-resultant-array-after-removing-anagrams
1461-check-if-a-string-contains-all-binary-codes-of-size-k
1500-count-largest-group
1510-find-lucky-integer-in-an-array
1590-make-sum-divisible-by-p
1612-avoid-flood-in-the-city
1632-number-of-good-ways-to-split-a-string
1635-number-of-good-pairs
1813-maximum-erasure-value
1834-minimum-number-of-people-to-teach
1930-unique-length-3-palindromic-subsequences
1980-find-unique-binary-string
1986-largest-color-value-in-a-directed-graph
1995-finding-pairs-with-a-certain-sum
2023-design-movie-rental-system
2059-unique-length-3-palindromic-subsequences
2079-delete-duplicate-folders-in-system
2169-simple-bank-system
2174-next-greater-numerically-balanced-number
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2237-longest-palindrome-by-concatenating-two-letter-words
2274-keep-multiplying-found-values-by-two
2402-meeting-rooms-iii
2429-design-a-food-rating-system
2479-meeting-rooms-iii
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2661-smallest-missing-non-negative-integer-after-operations
2685-first-completely-painted-row-or-column
2689-rearranging-fruits
2856-count-complete-subarrays-in-an-array
2915-count-of-interesting-subarrays
2975-maximum-square-area-by-removing-fences-from-a-field
3242-count-elements-with-maximum-frequency
3360-minimum-deletions-to-make-string-k-special
3381-maximum-subarray-sum-with-length-divisible-by-k
3437-maximum-total-damage-with-spell-casting
3445-lexicographically-minimum-string-after-removing-stars
3501-delete-nodes-from-linked-list-present-in-array
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3531-count-covered-buildings
3581-the-two-sneaky-numbers-of-digitville
3583-count-special-triplets
3592-find-x-sum-of-all-k-long-subarrays-ii
3606-coupon-code-validator
3610-find-x-sum-of-all-k-long-subarrays-i
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3678-design-task-manager
3713-longest-balanced-substring-i
3714-longest-balanced-substring-ii
3719-longest-balanced-subarray-i
3721-longest-balanced-subarray-ii
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3788-maximum-unique-subarray-sum-after-deletion
3797-design-spreadsheet
3827-implement-router
3834-minimum-operations-to-convert-all-elements-to-zero
3863-power-grid-maintenance
3872-find-most-frequent-vowel-and-consonant

Two Pointers

0011-container-with-most-water
0075-sort-colors
0088-merge-sorted-array
0165-compare-version-numbers
0611-valid-triangle-number
0696-count-binary-substrings
0868-push-dominoes
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1877-minimize-maximum-pair-sum-in-array
2320-find-all-k-distant-indices-in-an-array
2392-successful-pairs-of-spells-and-potions
2497-maximum-matching-of-players-with-trainers
2699-count-the-number-of-fair-pairs
3437-maximum-total-damage-with-spell-casting
3635-earliest-finish-time-for-land-and-water-rides-ii
3683-find-the-lexicographically-largest-string-from-the-box-i

Binary Search

0004-median-of-two-sorted-arrays
0611-valid-triangle-number
0794-swim-in-rising-water
0808-number-of-matching-subsequences
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1351-count-negative-numbers-in-a-sorted-matrix
1612-avoid-flood-in-the-city
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1851-maximum-number-of-events-that-can-be-attended-ii
1970-last-day-where-you-can-still-cross
2054-two-best-non-overlapping-events
2141-maximum-running-time-of-n-computers
2150-kth-smallest-product-of-two-sorted-arrays
2180-maximum-number-of-tasks-you-can-assign
2229-maximum-fruits-harvested-after-at-most-k-steps
2392-successful-pairs-of-spells-and-potions
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2618-maximize-the-minimum-powered-city
2699-count-the-number-of-fair-pairs
2720-minimize-the-maximum-difference-of-pairs
3437-maximum-total-damage-with-spell-casting
3453-separate-squares-i
3454-separate-squares-ii
3619-adjacent-increasing-subarrays-detection-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3635-earliest-finish-time-for-land-and-water-rides-ii
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3827-implement-router

Sorting

0049-group-anagrams
0075-sort-colors
0088-merge-sorted-array
0594-longest-harmonious-subsequence
0611-valid-triangle-number
0759-set-intersection-size-at-least-two
0761-special-binary-string
0778-reorganize-string
0808-number-of-matching-subsequences
0900-reordered-power-of-2
1018-largest-perimeter-triangle
1200-minimum-absolute-difference
1262-greatest-sum-divisible-by-three
1353-find-resultant-array-after-removing-anagrams
1478-maximum-number-of-events-that-can-be-attended
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1851-maximum-number-of-events-that-can-be-attended-ii
1877-minimize-maximum-pair-sum-in-array
1984-minimum-difference-between-highest-and-lowest-of-k-scores
2054-two-best-non-overlapping-events
2092-find-all-people-with-secret
2141-maximum-running-time-of-n-computers
2180-maximum-number-of-tasks-you-can-assign
2204-find-subsequence-of-length-k-with-the-largest-sum
2215-finding-3-digit-even-numbers
2274-keep-multiplying-found-values-by-two
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
2402-meeting-rooms-iii
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers
2689-rearranging-fruits
2699-count-the-number-of-fair-pairs
2887-sort-vowels-in-a-string
2943-maximize-area-of-square-hole-in-grid
3074-apple-redistribution-into-boxes
3075-maximize-happiness-of-selected-children
3241-divide-array-into-arrays-with-max-difference
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3307-find-the-maximum-sum-of-node-values
3321-type-of-triangle
3360-minimum-deletions-to-make-string-k-special
3433-count-mentions-per-user
3437-maximum-total-damage-with-spell-casting
3531-count-covered-buildings
3606-coupon-code-validator
3620-maximum-number-of-distinct-elements-after-operations
3622-maximum-frequency-of-an-element-after-performing-operations-i
3634-minimum-removals-to-balance-array
3635-earliest-finish-time-for-land-and-water-rides-ii
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3647-zero-array-transformation-iii
3748-sort-matrix-by-diagonals

Greedy

0011-container-with-most-water
0135-candy
0611-valid-triangle-number
0659-split-array-into-consecutive-subsequences
0759-set-intersection-size-at-least-two
0778-reorganize-string
0797-rabbits-in-forest
0955-delete-columns-to-make-sorted-ii
1018-largest-perimeter-triangle
1049-minimum-domino-rotations-for-equal-row
1262-greatest-sum-divisible-by-three
1382-balance-a-binary-search-tree
1448-maximum-69-number
1478-maximum-number-of-events-that-can-be-attended
1529-max-difference-you-can-get-from-changing-an-integer
1536-minimum-swaps-to-arrange-a-binary-grid
1612-avoid-flood-in-the-city
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful
1818-maximum-score-from-removing-substrings
1834-minimum-number-of-people-to-teach
1877-minimize-maximum-pair-sum-in-array
1917-maximum-average-pass-ratio
1975-maximum-matrix-sum
2140-longest-subsequence-repeated-k-times
2141-maximum-running-time-of-n-computers
2180-maximum-number-of-tasks-you-can-assign
2237-longest-palindrome-by-concatenating-two-letter-words
2387-partition-array-such-that-maximum-difference-is-k
2395-longest-binary-subsequence-less-than-or-equal-to-k
2497-maximum-matching-of-players-with-trainers
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2618-maximize-the-minimum-powered-city
2661-smallest-missing-non-negative-integer-after-operations
2689-rearranging-fruits
2704-maximum-difference-by-remapping-a-digit
2720-minimize-the-maximum-difference-of-pairs
3074-apple-redistribution-into-boxes
3075-maximize-happiness-of-selected-children
3143-longest-unequal-adjacent-groups-subsequence-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3241-divide-array-into-arrays-with-max-difference
3307-find-the-maximum-sum-of-node-values
3360-minimum-deletions-to-make-string-k-special
3445-lexicographically-minimum-string-after-removing-stars
3493-maximum-number-of-operations-to-move-ones-to-the-end
3620-maximum-number-of-distinct-elements-after-operations
3635-earliest-finish-time-for-land-and-water-rides-ii
3647-zero-array-transformation-iii
3741-reschedule-meetings-for-maximum-free-time-ii
3743-reschedule-meetings-for-maximum-free-time-i
3788-maximum-unique-subarray-sum-after-deletion
3834-minimum-operations-to-convert-all-elements-to-zero

Prefix Sum

1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1537-maximum-score-after-splitting-a-string
1590-make-sum-divisible-by-p
1895-largest-magic-square
1930-unique-length-3-palindromic-subsequences
2059-unique-length-3-palindromic-subsequences
2229-maximum-fruits-harvested-after-at-most-k-steps
2249-count-the-hidden-sequences
2358-number-of-ways-to-split-array
2394-count-subarrays-with-score-less-than-k
2483-minimum-penalty-for-a-shop
2529-range-product-queries-of-powers
2618-maximize-the-minimum-powered-city
2625-increment-submatrices-by-one
2691-count-vowel-strings-in-ranges
2906-construct-product-matrix
2915-count-of-interesting-subarrays
3381-maximum-subarray-sum-with-length-divisible-by-k
3383-taking-maximum-energy-from-the-mystic-dungeon
3432-count-partitions-with-even-sum-difference
3546-equal-sum-grid-partition-i
3578-count-partitions-with-max-min-difference-at-most-k
3616-make-array-elements-equal-to-zero
3618-find-the-original-typed-string-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3639-zero-array-transformation-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3647-zero-array-transformation-iii
3652-best-time-to-buy-and-sell-stock-using-strategy
3714-longest-balanced-substring-ii
3719-longest-balanced-subarray-i
3721-longest-balanced-subarray-ii
3761-maximum-difference-between-even-and-odd-frequency-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair
3794-find-the-minimum-amount-of-time-to-brew-potions

Combinatorics

2324-find-triangular-sum-of-an-array
2415-count-the-number-of-ideal-arrays
3201-distribute-candies-among-children-ii
3577-count-the-number-of-computer-unlocking-permutations
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3768-check-if-digits-are-equal-in-string-after-operations-i
3851-find-sum-of-array-product-of-magical-sequences

Number Theory

2307-replace-non-coprime-numbers-in-array
2415-count-the-number-of-ideal-arrays
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
3768-check-if-digits-are-equal-in-string-after-operations-i

Sliding Window

0219-contains-duplicate-ii
0594-longest-harmonious-subsequence
0867-new-21-game
0940-fruit-into-baskets
1586-longest-subarray-of-1s-after-deleting-one-element
1813-maximum-erasure-value
1984-minimum-difference-between-highest-and-lowest-of-k-scores
2229-maximum-fruits-harvested-after-at-most-k-steps
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2527-count-subarrays-with-fixed-bounds
2618-maximize-the-minimum-powered-city
2856-count-complete-subarrays-in-an-array
3213-count-subarrays-where-max-element-appears-at-least-k-times
3479-count-the-number-of-substrings-with-dominant-ones
3578-count-partitions-with-max-min-difference-at-most-k
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3622-maximum-frequency-of-an-element-after-performing-operations-i
3634-minimum-removals-to-balance-array
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3652-best-time-to-buy-and-sell-stock-using-strategy
3743-reschedule-meetings-for-maximum-free-time-i
3761-maximum-difference-between-even-and-odd-frequency-ii

Queue

2180-maximum-number-of-tasks-you-can-assign
2408-number-of-people-aware-of-a-secret
2527-count-subarrays-with-fixed-bounds
2618-maximize-the-minimum-powered-city
3578-count-partitions-with-max-min-difference-at-most-k
3827-implement-router

Monotonic Queue

2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds
3578-count-partitions-with-max-min-difference-at-most-k

Linked List

0817-design-hashmap
1411-convert-binary-number-in-a-linked-list-to-integer
3501-delete-nodes-from-linked-list-present-in-array
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Design

0535-encode-and-decode-tinyurl
0817-design-hashmap
1995-finding-pairs-with-a-certain-sum
2023-design-movie-rental-system
2169-simple-bank-system
2429-design-a-food-rating-system
3678-design-task-manager
3797-design-spreadsheet
3827-implement-router

Hash Function

0535-encode-and-decode-tinyurl
0817-design-hashmap
1461-check-if-a-string-contains-all-binary-codes-of-size-k
2079-delete-duplicate-folders-in-system

Counting

0383-ransom-note
0594-longest-harmonious-subsequence
0778-reorganize-string
0900-reordered-power-of-2
1227-number-of-equivalent-domino-pairs
1297-maximum-number-of-balloons
1510-find-lucky-integer-in-an-array
1635-number-of-good-pairs
1986-largest-color-value-in-a-directed-graph
2140-longest-subsequence-repeated-k-times
2174-next-greater-numerically-balanced-number
2237-longest-palindrome-by-concatenating-two-letter-words
3242-count-elements-with-maximum-frequency
3360-minimum-deletions-to-make-string-k-special
3437-maximum-total-damage-with-spell-casting
3493-maximum-number-of-operations-to-move-ones-to-the-end
3583-count-special-triplets
3629-total-characters-in-string-after-transformations-i
3630-total-characters-in-string-after-transformations-ii
3713-longest-balanced-substring-i
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3872-find-most-frequent-vowel-and-consonant

Bit Manipulation

0067-add-binary
0190-reverse-bits
0201-bitwise-and-of-numbers-range
0231-power-of-two
0342-power-of-four
0401-binary-watch
0693-binary-number-with-alternating-bits
0756-pyramid-transition-matrix
0762-prime-number-of-set-bits-in-binary-representation
0868-binary-gap
0934-bitwise-ors-of-subarrays
1018-binary-prefix-divisible-by-5
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1461-check-if-a-string-contains-all-binary-codes-of-size-k
1632-number-of-good-ways-to-split-a-string
1680-concatenation-of-consecutive-binary-numbers
1732-minimum-one-bit-operations-to-make-integers-zero
1930-unique-length-3-palindromic-subsequences
2059-unique-length-3-palindromic-subsequences
2170-count-number-of-maximum-bitwise-or-subsets
2400-minimum-score-after-removals-on-a-tree
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2529-range-product-queries-of-powers
2659-number-of-even-and-odd-bits
2837-minimum-operations-to-make-the-integer-zero
3233-maximize-the-number-of-partitions-after-operations
3307-find-the-maximum-sum-of-node-values
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3644-maximum-k-to-sort-a-permutation
3676-smallest-number-with-all-set-bits
3744-minimum-operations-to-make-array-elements-zero
3851-find-sum-of-array-product-of-magical-sequences
3882-minimum-xor-path-in-a-grid

Heap (Priority Queue)

0407-trapping-rain-water-ii
0659-split-array-into-consecutive-subsequences
0778-reorganize-string
0794-swim-in-rising-water
1478-maximum-number-of-events-that-can-be-attended
1612-avoid-flood-in-the-city
1917-maximum-average-pass-ratio
2023-design-movie-rental-system
2054-two-best-non-overlapping-events
2204-find-subsequence-of-length-k-with-the-largest-sum
2267-minimum-difference-in-sums-after-removal-of-elements
2402-meeting-rooms-iii
2429-design-a-food-rating-system
2479-meeting-rooms-iii
3445-lexicographically-minimum-string-after-removing-stars
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3647-zero-array-transformation-iii
3650-minimum-cost-path-with-edge-reversals
3678-design-task-manager
3863-power-grid-maintenance

Enumeration

0900-reordered-power-of-2
1747-lexicographically-smallest-string-after-applying-operations
1925-count-square-sum-triples
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets
2174-next-greater-numerically-balanced-number
2202-sum-of-k-mirror-numbers
2215-finding-3-digit-even-numbers
2837-minimum-operations-to-make-the-integer-zero
2975-maximum-square-area-by-removing-fences-from-a-field
3201-distribute-candies-among-children-ii
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3459-find-the-minimum-area-to-cover-all-ones-ii
3479-count-the-number-of-substrings-with-dominant-ones
3546-equal-sum-grid-partition-i
3683-find-the-lexicographically-largest-string-from-the-box-i
3713-longest-balanced-substring-i
3741-reschedule-meetings-for-maximum-free-time-ii
3761-maximum-difference-between-even-and-odd-frequency-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair

Simulation

0067-add-binary
0498-diagonal-traverse
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1545-find-kth-bit-in-nth-binary-string
1642-water-bottles
1680-concatenation-of-consecutive-binary-numbers
2048-build-array-from-permutation
2137-final-value-of-variable-after-performing-operations
2169-simple-bank-system
2211-count-collisions-on-a-road
2260-divide-a-string-into-groups-of-size-k
2274-keep-multiplying-found-values-by-two
2288-count-operations-to-obtain-zero
2324-find-triangular-sum-of-an-array
2343-count-unguarded-cells-in-the-grid
2402-meeting-rooms-iii
2408-number-of-people-aware-of-a-secret
2479-meeting-rooms-iii
3336-water-bottles-ii
3379-transformed-array
3433-count-mentions-per-user
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3600-find-the-k-th-character-in-string-game-i
3616-make-array-elements-equal-to-zero
3768-check-if-digits-are-equal-in-string-after-operations-i
3790-fruits-into-baskets-ii
3794-find-the-minimum-amount-of-time-to-brew-potions

Graph

1424-maximum-candies-you-can-get-from-boxes
1986-largest-color-value-in-a-directed-graph
2092-find-all-people-with-secret
2438-find-closest-node-to-given-two-nodes
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3863-power-grid-maintenance

Matrix

0036-valid-sudoku
0037-sudoku-solver
0073-set-matrix-zeroes
0085-maximal-rectangle
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0498-diagonal-traverse
0794-swim-in-rising-water
0840-magic-squares-in-grid
0945-snakes-and-ladders
1254-number-of-closed-islands
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1351-count-negative-numbers-in-a-sorted-matrix
1402-count-square-submatrices-with-all-ones
1536-minimum-swaps-to-arrange-a-binary-grid
1628-count-submatrices-with-all-ones
1895-largest-magic-square
1970-last-day-where-you-can-still-cross
1975-maximum-matrix-sum
2244-number-of-laser-beams-in-a-bank
2343-count-unguarded-cells-in-the-grid
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2625-increment-submatrices-by-one
2685-first-completely-painted-row-or-column
2906-construct-product-matrix
3415-check-if-grid-satisfies-conditions
3459-find-the-minimum-area-to-cover-all-ones-ii
3461-find-the-minimum-area-to-cover-all-ones-i
3546-equal-sum-grid-partition-i
3619-count-islands-with-total-value-divisible-by-k
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3648-find-the-maximum-number-of-fruits-collected
3651-minimum-cost-path-with-teleportations
3733-length-of-longest-v-shaped-diagonal-segment
3748-sort-matrix-by-diagonals
3797-design-spreadsheet
3882-minimum-xor-path-in-a-grid

Shortest Path

2976-minimum-cost-to-convert-string-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3650-minimum-cost-path-with-edge-reversals

Union Find

0128-longest-consecutive-sequence
0794-swim-in-rising-water
1058-lexicographically-smallest-equivalent-string
1970-last-day-where-you-can-still-cross
2092-find-all-people-with-secret
3863-power-grid-maintenance

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
0808-number-of-matching-subsequences
1350-remove-sub-folders-from-the-filesystem
2079-delete-duplicate-folders-in-system

Tree

0110-balanced-binary-tree
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree
2400-minimum-score-after-removals-on-a-tree
2872-maximum-number-of-k-divisible-components
3307-find-the-maximum-sum-of-node-values
3562-maximum-profit-from-trading-stocks-with-discounts
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Topological Sort

1986-largest-color-value-in-a-directed-graph

Memoization

1732-minimum-one-bit-operations-to-make-integers-zero
1986-largest-color-value-in-a-directed-graph
2028-the-earliest-and-latest-rounds-where-players-compete
2395-longest-binary-subsequence-less-than-or-equal-to-k
3733-length-of-longest-v-shaped-diagonal-segment

Depth-First Search

0110-balanced-binary-tree
0386-lexicographical-numbers
0417-pacific-atlantic-water-flow
0794-swim-in-rising-water
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1254-number-of-closed-islands
1339-maximum-product-of-splitted-binary-tree
1350-remove-sub-folders-from-the-filesystem
1382-balance-a-binary-search-tree
1747-lexicographically-smallest-string-after-applying-operations
1970-last-day-where-you-can-still-cross
2092-find-all-people-with-secret
2400-minimum-score-after-removals-on-a-tree
2438-find-closest-node-to-given-two-nodes
2872-maximum-number-of-k-divisible-components
3562-maximum-profit-from-trading-stocks-with-discounts
3619-count-islands-with-total-value-divisible-by-k
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii
3863-power-grid-maintenance

Breadth-First Search

0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0794-swim-in-rising-water
0865-smallest-subtree-with-all-the-deepest-nodes
0945-snakes-and-ladders
1161-maximum-level-sum-of-a-binary-tree
1254-number-of-closed-islands
1424-maximum-candies-you-can-get-from-boxes
1747-lexicographically-smallest-string-after-applying-operations
1970-last-day-where-you-can-still-cross
2092-find-all-people-with-secret
3619-count-islands-with-total-value-divisible-by-k
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii
3666-minimum-operations-to-equalize-binary-string
3863-power-grid-maintenance

Stack

0085-maximal-rectangle
1628-count-submatrices-with-all-ones
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1653-minimum-deletions-to-make-string-balanced
1818-maximum-score-from-removing-substrings
2211-count-collisions-on-a-road
2307-replace-non-coprime-numbers-in-array
2520-using-a-robot-to-print-the-lexicographically-smallest-string
3445-lexicographically-minimum-string-after-removing-stars
3834-minimum-operations-to-convert-all-elements-to-zero

Divide and Conquer

0004-median-of-two-sorted-arrays
0190-reverse-bits
0761-special-binary-string
1382-balance-a-binary-search-tree
3719-longest-balanced-subarray-i
3721-longest-balanced-subarray-ii

Backtracking

0037-sudoku-solver
0401-binary-watch
0679-24-game
0756-pyramid-transition-matrix
1980-find-unique-binary-string
2140-longest-subsequence-repeated-k-times
2170-count-number-of-maximum-bitwise-or-subsets
2174-next-greater-numerically-balanced-number

Recursion

0231-power-of-two
0326-power-of-three
0342-power-of-four
1545-find-kth-bit-in-nth-binary-string
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Segment Tree

3454-separate-squares-ii
3719-longest-balanced-subarray-i
3721-longest-balanced-subarray-ii
3789-maximize-subarrays-after-removing-one-conflicting-pair
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii

Brainteaser

2503-longest-subarray-with-maximum-bitwise-and
2837-minimum-operations-to-make-the-integer-zero
3462-vowels-game-in-a-string
3577-count-the-number-of-computer-unlocking-permutations

Ordered Set

2023-design-movie-rental-system
2429-design-a-food-rating-system
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3666-minimum-operations-to-equalize-binary-string
3678-design-task-manager
3790-fruits-into-baskets-ii
3791-fruits-into-baskets-iii
3827-implement-router
3863-power-grid-maintenance

Probability and Statistics

0826-soup-servings
0867-new-21-game

Monotonic Stack

0085-maximal-rectangle
1628-count-submatrices-with-all-ones
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
3834-minimum-operations-to-convert-all-elements-to-zero

Geometry

0830-largest-triangle-area
1266-minimum-time-visiting-all-points
3047-find-the-largest-area-of-square-inside-two-rectangles
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii

Game Theory

3462-vowels-game-in-a-string

Bitmask

3233-maximize-the-number-of-partitions-after-operations
3851-find-sum-of-array-product-of-magical-sequences

Binary Tree

0110-balanced-binary-tree
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree

Line Sweep

3454-separate-squares-ii

Doubly-Linked List

3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Graph Theory

2976-minimum-cost-to-convert-string-i
3650-minimum-cost-path-with-edge-reversals

Binary Search Tree

1382-balance-a-binary-search-tree

Rolling Hash

1461-check-if-a-string-contains-all-binary-codes-of-size-k

Union-Find

1254-number-of-closed-islands
3619-count-islands-with-total-value-divisible-by-k
3666-minimum-operations-to-equalize-binary-string