//递归intbinary_search(vector<int>& nums,inttarget,intlow,inthigh) {if(low >high)returnlow;intmid = low + (high - low) /2;if(nums[mid] >target) {returnbinary_search(nums, target, low, mid -1);elseif(nums[mid] <target) {returnbinary_search(nums, targetm mid +1, high);else{...
Binary search algorithm is a fast search algorithm which divides the given data set into half over and over again to search the required number.
Algorithm | Binary Search 花了半天把二分查找的几种都写了一遍。验证了一下。二分查找的正确编写的关键就是,确保循环的初始、循环不变式能够保证一致。 可以先从循环里面确定循环不变式,然后再推导初始条件,最后根据循环不变式的内容推导出结果。 1. 普通的二分查找 第一版本: 1//first version2intfind(intarr...
binary_search 检查等价于value的元素是否出现在范围[first,last)中出现。内部一般使用std::lower_bound实现。 函数签名 conststd::vector<int>data{11,12,14,15,15,16};assert(std::binary_search(data.cbegin(),data.cend(),10)==false);assert(std::binary_search(data.cbegin(),data.cend(),11)==tru...
def binary_search_recur(arr, low, high, x): if low > high: return -1 mid = (low + high) // 2 if x < arr[mid]: return binary_search_recur(arr, low, mid - 1, x) elif x > arr[mid]: return binary_search_recur(arr, mid + 1, high, x) else: return mid 1 2 3 4 ...
The explanation above provides a rough description of the algorithm. For the implementation details, we'd need to be more precise. We will maintain a pair$L < R$such that$A_L \leq k < A_R$. Meaning that the active search interval is$[L, R)$. We use half-interval here instead of...
In computer science, binary search is a search algorithm that finds the position of a target value within a sorted array. 二分搜索算法 在对数组的搜索算法之中,最朴素的思想就是从数组的第一个元素开始,逐个将数组中的元素与目标值做比较,以得到用户期望的元素下标,因此朴素的搜索算法是一种O(N)时间的...
Lesson 14Binary search algorithmOpen reading material (PDF) Tasks:medium MinMaxDivision VIEW START Divide array A into K blocks and minimize the largest sum of any block. medium NailingPlanks VIEW START Count the minimum number of nails that allow a series of planks to be nailed. ...
Binary Search Algorithm Implementation #include<bits/stdc++.h>using namespace std;intbinarySearch(intarr[],intlo,inthi,intx){while(lo<=hi){intm=lo+(hi-lo)/2;if(arr[m]==x)returnm;if(arr[m]<x)lo=m+1;elsehi=m-1;}return-1;}intmain(void){intn=9;intarr[]={1,2,3,4,5,6,...
二、有序容器中通过二分法查找指定元素 - binary_search 函数 1、函数原型分析 2、二分查找时间复杂度分析 3、代码示例 一、查找两个相邻重复元素 - adjacent_find 函数 1、函数原型分析 在C++ 语言 的 标准模板库 ( STL , STL Standard Template Library ) 中 , 提供了 adjacent_find 算法函数 用于 在 容器...