求救！（P2249）

#include<bits/stdc++.h>
#include<cstdio>
using namespace std;
int t(int val,vector<int>arr,int left,int right){
	while(left<=right){
		int mid=left+(right-left)/2;	
		if(arr[mid]==val){
			return mid+1;
		}else{
			if(arr[mid]<val){
				left=mid+1;
				continue;
			}else{
				if(arr[mid]>val){
					right=mid-1;
					continue;
				}	
			}
		}
	}
	return -1;
}
int main(){
	int n,m;
	cin >>n>>m;
	vector<int>a;
	
	for(int i=0;i<n;i++){
		int y;
		cin >>y;
		a.push_back(y);
	}
	for(int i=0;i<m;i++){
		int x;
		cin >>x;
		cout<<t(x,a,0,a.size()-1)<<" ";
	}
	
	return 0;
}