66. Plus One
88. Merge Sorted Array
169. Majority Element
56. Merge Intervals
57. Insert Interval
63. Unique Paths II
105. Construct Binary Tree from Preorder and Inorder Traversal
106. Construct Binary Tree from Inorder and Postorder Traversal
128. Longest Consecutive Sequence
208. Implement Trie (Prefix Tree)
209. Minimum Size Subarray Sum
221. Maximal Square
452. Minimum Number of Arrows to Burst Balloons