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leetcode34. Find First and Last Position of Element in Sorted Array

二分查找不只是查找,还可以根据需求添加条件进行查找,比如这个题,左端点的条件就是边界点或者小于target,右端点的条件就是!=size()或者大于.根据这个找到查找的条件…

Leetcode34.Find First and Last Position of Element in Sorted Array在排序数组中查找元素的位置

给定一个按照升序排列的整数数组 nums,和一个目标值 target.找出给定目标值在数组中的开始位置和结束位置. 你的算法时间复杂度必须是 O(log n) 级别. 如果数组中不存在目标值,返回 [-1, -1]. 示例 1: 输入: nums = [5,7,7,8,8,10], target = 8 输出: [3,4] 示例 2: 输入: nums = [5,7,7,8,8,10], target = 6 输出: [-1,-1] class Solution { public: vector…

Leetcode 34 Find First and Last Position of Element in Sorted Array 解题思路 (python)

本人编程小白,如果有写的不对.或者能更完善的地方请个位批评指正! 这个是leetcode的第34题,这道题的tag是数组,需要用到二分搜索法来解答 34. Find First and Last Position of Element in Sorted Array Given an array of integers nums sorted in ascending order, find the starting and ending position of a given target v…

leetcode-algorithms-34 Find First and Last Position of Element in Sorted Array

leetcode-algorithms-34 Find First and Last Position of Element in Sorted Array Given an array of integers nums sorted in ascending order, find the starting and ending position of a given target value. Your algorithm's runtime complexity must be in th…

乘风破浪：LeetCode真题_034_Find First and Last Position of Element in Sorted Array

乘风破浪:LeetCode真题_034_Find First and Last Position of Element in Sorted Array 一.前言 这次我们还是要改造二分搜索,但是想法却有一点不一样. 二.Find First and Last Position of Element in Sorted Array 2.1 问题 2.2 分析与解决 查找问题,时间复杂度要求对数级别的,我们自然的想到了二分查找,和上一题一样,需求都是有点不一样的,这次是有重复的数字,找出某一特定的重…

Find First and Last Position of Element in Sorted Array - LeetCode

目录 题目链接 注意点 解法 小结 题目链接 Find First and Last Position of Element in Sorted Array - LeetCode 注意点 nums可能为空 时间复杂度为O(logn) 解法 解法一:最普通的二分搜索,先找到一个target,然后向两边拓展. class Solution { public: int binarySearch(vector<int>& nums, int target) { int left = 0,rig…

[LeetCode] 34. Search for a Range 搜索一个范围(Find First and Last Position of Element in Sorted Array)

原题目:Search for a Range, 现在题目改为: 34. Find First and Last Position of Element in Sorted Array Given an array of integers nums sorted in ascending order, find the starting and ending position of a given target value. Your algorithm's runtime complexity…

刷题34. Find First and Last Position of Element in Sorted Array

一.题目说明 题目是34. Find First and Last Position of Element in Sorted Array,查找一个给定值的起止位置,时间复杂度要求是Olog(n).题目的难度是Medium! 二.我的解答 这个题目还是二分查找(折半查找),稍微变化一下.target==nums[mid]后,需要找前面.后面的值是否=target. 一次写出来,bug free,熟能生巧!怎一个爽字了得! #include<iostream> #include<vecto…

[LeetCode] 34. Find First and Last Position of Element in Sorted Array == [LintCode] 61. Search for a Range_Easy tag: Binary Search

Description Given a sorted array of n integers, find the starting and ending position of a given target value. If the target is not found in the array, return [-1, -1]. Example Given [5, 7, 7, 8, 8, 10] and target value 8,return [3, 4]. Challenge O(l…

Leetcode: Find First and Last Position of Element in Sorted Array

Given a sorted array of integers, find the starting and ending position of a given target value. Your algorithm's runtime complexity must be in the order of O(log n). If the target , -]. For example, Given [, , , , , ] and target value , , ]. Analysi…