25. Reverse Nodes in k-Group 题目: Given a linked list, reverse the nodes ...

200. Number of Islands 题目: Given a 2d grid map of '1's (land) and '0's (...

39. Combination Sum 题目: Given a set of candidate numbers (C) and a targe...

23.Merge k Sorted Lists 题目: Merge k sorted linked lists and return it as...

题目: Implement regular expression matching with support for . and *. Regu...

31. Next Permutation 题目:Implement next permutation, which rearranges num...

17 Letter Combinations of a Phone Number 题目:Given a digit string, return...

42 Trapping Rain Water 题目:Given n non-negative integers representing an ...