0分求助！！！

#include<bits/stdc++.h>
using namespace std;
int n,m,a[1000001],b; 
int main(){
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    for(int i=1;i<=m;i++){
        cin>>b;
        int l=1,h=n,mid=1;  
        while(l<h){
            mid=(l+h)/2;
            if(a[mid]>=b){
                h=mid-1;
            }
            else l=mid+1;
        }
        if(a[l]==b) cout<<l<<" ";
        else cout<<-1<<" ";
    }
    return 0;
}