题目描述 A peak element is an element that is greater than its neighbors. Given an input array where num[i] ≠ num[…

Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ……

Populating Next Right Pointers in Each Node I Given a binary tree struct TreeLinkNode { TreeLinkNode *left; Tr…

1. 题目 Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note:You ma…

题目地址：https://leetcode-cn.com/probl…题目描述：给定两个单词 word1 和 word2，计算出将 word1 转换成 word2 所使用的最少操作数 。 你可以对一个单词进行…

  There are N gas stations along a circular route, where the amount of gas at station i&nb…

  Given strings S and T, find the minimum (contiguous) substring W of …

题目描述 Given a sorted integer array without duplicates, return the summary of its ranges. For example, given [0,…

题目描述 Compare two version numbers version1 and version2. If version1 > version2 return 1, if version1 < v…

58. Length of Last Word 题目 Given a string s consists of upper/lower-case alphabets and empty space characters …

  Given an array of non-negative integers, you are initially positioned at the first index of the array. …

Validate if a given string is numeric. Some examples:"0" => true" 0.1 " => true"abc"…