lychnis:
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503. Next Greater Element II 450. Delete Node in a BST 5. Longest Palindromic Substring 36. Valid Sudoku 38. Count and Say 63. Unique Paths II 617. Merge Two Binary Trees 139. Word Break 141. Linked List Cycle 491. Increasing Subsequences 380. Insert Delete GetRandom O 50. Pow(x, n)
503. Next Greater Element II
450. Delete Node in a BST
5. Longest Palindromic Substring
36. Valid Sudoku
38. Count and Say
63. Unique Paths II
617. Merge Two Binary Trees
139. Word Break
141. Linked List Cycle
491. Increasing Subsequences
380. Insert Delete GetRandom O
50. Pow(x, n)