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

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

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

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

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

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

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

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