#include<bits/stdc++.h>
using namespace std;
const int qwq = 1e6 + 10;
int a[qwq];
int n,m;
int er(int num){
    int l = 1,r = n;
    while(l != r){
        int m = (l + r) / 2;
        if(a[m] > num){
            r = m;
        }else{
            l = m + 1;
        }
    }
    if(a[l] == num){
        return l;
    }else{
        return -1;
    }
}
int main(){
    
    cin>>n>>m;
    for(int i = 1;i <= n;i++){
        cin>>a[i];
    }
    int t;
    while(m--){
        cin>>t;
        cout<<er(t)<<" ";
    }
    return 0;
}

我觉得不应该，理论上说我的代码是正确的