C++ 一个简单的二分法查找

#include <iostream>
#include <vector>
using namespace std;
int findBin(vector<int>& arr,int target){
    int l=0,r=arr.size()-1;
    int mid;
    while(l<=r){
        mid=(l+r)/2;
        if(arr[mid]==target) return mid;
        if(target<arr[mid]){
            r=mid-1;
        }
        else{
            l=mid+1;
        }
    }
    return -1;
}
int main()
{
    int arr[]={1,2,4,5,7,8,10,12,13,18,24,29,54,321,777,785,988};
    vector<int> arra(arr,arr+17);
    int num;
    while(1){
        cin>>num;
        if(num==-1)return 0;
        cout<<findBin(arra,num)<<endl;
    }
    
}

 

来源：CSDN

作者：啊罗罗

链接：https://blog.csdn.net/dyyzlzc/article/details/103606148