u012535905的博客

题目描述：Implement strStr().Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.Example 1:Input: haystack = "hello", needle = "ll"Output: 2Example 2:I...

题目描述：Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length.Do not allocate extra space for another array, you must do this by modi...

leetcode中常见的backTrack类题目：combination、subsets、permutation、Palindrome Partitioning.1、combination<1>leetcode39. Combination Sum题目描述：Given a collection of candidate numbers (candidates) and a target...