P1918 Bowling (sort + two points)

Title description

Code

#include<bits/stdc++.h>
using namespace std;
const int maxn = 1e5+50;
int n,a[maxn],q,t;
vector<pair<int,int> >v;
bool cmp(pair<int,int> p1,pair<int,int> p2){
    
    	//比较函数
	return p1.second < p2.second;
}
int f(int t){
    
    		//手动二分
	int l = 0,r = n;
	while(l < r){
    
    
		int mid = l + (r-l)/2;
		if(v[mid].second >= t ){
    
    
			r = mid;
		}
		else{
    
    
			l = mid+1;
		}
	}
	if(l == n)
		return 0;
	if(v[l].second == t){
    
    
		return v[l].first;
	}
	return 0;
}
int main(){
    
    
	//freopen("a.txt","r",stdin);
	cin>>n;
	for(int i = 0;i< n;i++){
    
    
		cin>>t;
		pair<int,int> p = make_pair(i+1,t);
		v.push_back(p);
	}
	sort(v.begin(),v.begin()+n,cmp);
	cin>>q;
	for(int i = 0;i< q;i++){
    
    
		cin>>t;
		cout<<f(t)<<endl;
	}
	return 0;
}