"hopebetter"版题解

#include<iostream>
#include<algorithm>
using namespace std;
using i64 = long long;
using i32 = int32_t;
#ifndef ONLINE_JUDGE
#include "test.h"
#else
#define debug(...) 42
#define debug_assert(...) 42
#endif

int main(){
    cin.tie(0)->sync_with_stdio(0);
    cout.tie(0)->sync_with_stdio(0);
    i64 n,m,a[1000010];
    cin>>n>>m;
    for (i64 i=1;i<=n;i++) cin>>a[i];
    while(m--){
        i32 target;
        cin>>target;
        if (!binary_search(a+1,a+n+1,target)) cout<<-1<<' ';
        else cout<<lower_bound(a+1,a+n+1,target)-a<<' ';
    }
    return 0;
}