标签： leetcode
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31. Next Permutation
Implement next permutation, which rearranges numbers in…
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22. Generate Parentheses
Given n pairs of parentheses, write a function to gener…
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19. Remove Nth Node From End of List
Given a linked list, remove the n-th node from the end …
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18. 4Sum
Given an array nums of n integers and an integer target…
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16. 3Sum Closest
Given an array nums of n integers and an integer target…
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17. Letter Combinations of a Phone Number
Given a string containing digits from 2-9 inclusive, re…
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988-从叶结点开始的最小字符串
给定一颗根结点为 root 的二叉树，书中的每个结点都有一个从 0 到 25 的值，分别代表字母 ‘a’ 到 …
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107. Binary Tree Level Order Traversal II
Given a binary tree, return the bottom-up level order t…
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100. Same Tree
Given two binary trees, write a function to check if th…
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88. Merge Sorted Array
Given two sorted integer arrays nums1 and nums2, merge …