🚀 ZERO TO HERO JAVA WITH DSA ☕︎

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📈 Progress

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🛠️ Step 1: Learn the Basics

Progress: 19 / 31

🎓 Lec 1: Things to Know in C++/Java/Python or any language

Progress: 9 / 9

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	User Input / Output	🟢 Easy	✅ Done
2️⃣	Data Types	🟢 Easy	✅ Done
3️⃣	If Else statements	🟢 Easy	✅ Done
4️⃣	Switch Statement	🟢 Easy	✅ Done
5️⃣	What are arrays, strings?	🟢 Easy	✅ Done
6️⃣	For loops	🟢 Easy	✅ Done
7️⃣	While loops	🟢 Easy	✅ Done
8️⃣	Functions (Pass by Reference and Value)	🟢 Easy	✅ Done
9️⃣	Time Complexity [Basics]	🟢 Easy	✅ Done

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🧠 Lec 2: Build-up Logical Thinking

Progress: 1 / 1

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📚 Lec 3: Learn STL/Java-Collections or similar thing in your language

Progress: 1 / 1

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	Java	🟡 Medium	✅ Done

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🔢 Lec 4: Know Basic Maths

Progress: 7 / 7

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	Count Digits	🟢 Easy	✅ Done
2️⃣	Reverse a Number	🟢 Easy	✅ Done
3️⃣	Check Palindrome	🟢 Easy	✅ Done
4️⃣	GCD Or HCF	🟢 Easy	✅ Done
5️⃣	Armstrong Numbers	🟢 Easy	✅ Done
6️⃣	Print all Divisors	🟢 Easy	✅ Done
7️⃣	Check for Prime	🟢 Easy	✅ Done

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🔄 Step 2: Learn Important Sorting Techniques

Progress: 3 / 3

📋 Lec 1: Sorting-I

Progress: 3 / 3

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	Selection Sort	🟢 Easy	✅ Done
2️⃣	Bubble Sort	🟢 Easy	✅ Done
3️⃣	Insertion Sort	🟢 Easy	✅ Done

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📋 Lec 2: Cyclic Sort

Progress: 7 / 7

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	Cyclic Sort	🟢 Easy	✅ Done
2️⃣	Find All Duplicates	🟡 Medium	✅ Done
3️⃣	Find All Missing Numbers	🟡 Medium	✅ Done
4️⃣	Find Duplicate	🟡 Medium	✅ Done
5️⃣	Missing Number	🟢 Easy	✅ Done
6️⃣	First Missing Positive	🔴 Hard	✅ Done
7️⃣	Set Mismatch	🟡 Medium	✅ Done

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🧩 Step 3: Solve Problems on Arrays [Easy → Medium → Hard]

Progress: 40 / 40

🟢 Lec 1: Easy

Progress: 14 / 14

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	Largest Element in an Array	🟢 Easy	✅ Done
2️⃣	Second Largest Element in an Array	🟢 Easy	✅ Done
3️⃣	Check if the array is sorted	🟢 Easy	✅ Done
4️⃣	Remove duplicates from Sorted array	🟢 Easy	✅ Done
5️⃣	Left Rotate an array by one place	🟢 Easy	✅ Done
6️⃣	Left rotate an array by D places	🟢 Easy	✅ Done
7️⃣	Move Zeros to end	🟢 Easy	✅ Done
8️⃣	Linear Search	🟢 Easy	✅ Done
9️⃣	Find the Union	🟡 Medium	✅ Done
🔟	Find missing number in an array	🟢 Easy	✅ Done
1️⃣1️⃣	Maximum Consecutive Ones	🟢 Easy	✅ Done
1️⃣2️⃣	Find the number that appears once	🟡 Medium	✅ Done
1️⃣3️⃣	Longest subarray with given sum K (positives)	🟡 Medium	✅ Done
1️⃣4️⃣	Longest subarray with sum K (Positives + Negatives)	🟡 Medium	✅ Done

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🟡 Lec 2: Medium

Progress: 14 / 14

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	2Sum Problem	🟡 Medium	✅ Done
2️⃣	Sort an array of 0's, 1's, and 2's	🟡 Medium	✅ Done
3️⃣	Majority Element (>RecursionBasic/2 times)	🟢 Easy	✅ Done
4️⃣	Kadane's Algorithm	🟢 Easy	✅ Done
5️⃣	Print subarray with maximum subarray sum	🟡 Medium	✅ Done
6️⃣	Stock Buy and Sell	🟢 Easy	✅ Done
7️⃣	Rearrange the array in alternating positive and negative items	🟡 Medium	✅ Done
8️⃣	Next Permutation	🟡 Medium	✅ Done
9️⃣	Leaders in an Array problem	🟢 Easy	✅ Done
🔟	Longest Consecutive Sequence in an Array	🟡 Medium	✅ Done
1️⃣1️⃣	Set Matrix Zeros	🟡 Medium	✅ Done
1️⃣2️⃣	Rotate Matrix by 90 degrees	🟡 Medium	✅ Done
1️⃣3️⃣	Print the matrix in spiral manner	🟡 Medium	✅ Done
1️⃣4️⃣	Count subarrays with given sum	🟢 Easy	✅ Done

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🔴 Lec 3: Hard

Progress: 12 / 12

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	Pascal's Triangle	🟡 Medium	✅ Done
2️⃣	Majority Element (RecursionBasic/3 times)	🟡 Medium	✅ Done
3️⃣	3-Sum Problem	🟡 Medium	✅ Done
4️⃣	4-Sum Problem	🔴 Hard	✅ Done
5️⃣	Largest Subarray with 0 Sum	🟡 Medium	✅ Done
6️⃣	Count number of subarrays with given xor K	🔴 Hard	✅ Done
7️⃣	Merge Overlapping Subintervals	🟡 Medium	✅ Done
8️⃣	Merge two sorted arrays without extra space	🟡 Medium	✅ Done
9️⃣	Find the repeating and missing number	🔴 Hard	✅ Done
🔟	Count Inversions	🔴 Hard	✅ Done
1️⃣1️⃣	Reverse Pairs	🔴 Hard	✅ Done
1️⃣2️⃣	Maximum Product Subarray	🟢 Easy	✅ Done

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🔍 Step 4: Binary Search [1D, 2D Arrays, Search Space]

Progress: 12 / 12

📊 Lec 1: BS on 1D Arrays

Progress: 9 / 9

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	Binary Search to find X in sorted array	🟢 Easy	✅ Done
2️⃣	Implement Lower Bound	🟢 Easy	✅ Done
3️⃣	Implement Upper Bound	🟢 Easy	✅ Done
4️⃣	Search Insert Position	🟢 Easy	✅ Done
5️⃣	Floor/Ceil in Sorted Array	🟡 Medium	✅ Done
6️⃣	Find the first or last occurrence of a number	🟢 Easy	✅ Done
7️⃣	Count occurrences of a number in a sorted array	🟢 Easy	✅ Done
8️⃣	Search in Rotated Sorted Array I	🟡 Medium	✅ Done
9️⃣	Search in Rotated Sorted Array II	🟡 Medium	✅ Done

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🧮 Lec 2: BS on Answers

Progress: 3 / 3

🔢	📝 Topic	🎯 Difficulty	✅ Status
1️⃣	Find square root of a number in log RecursionBasic	🟡 Medium	✅ Done
2️⃣	Find the Nth root of a number using binary search	🟡 Medium	✅ Done
3️⃣	Koko Eating Bananas	🟡 Medium	✅ Done

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🎉 Keep Going! You're doing amazing!