题目链接：https://www.luogu.com.cn/problem/P1918
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <unordered_map>
using namespace std
;
int n
;
unordered_map
<int, int> h
;
int main(){
cin
>> n
;
for (int i
= 1; i
<= n
; i
++){
int a
; cin
>> a
;
h
[a
] = i
;
}
int q
; cin
>> q
;
while (q
-- ){
int a
; cin
>> a
;
if (h
.count(a
)) cout
<< h
[a
] << endl
;
else puts("0");
}
return 0;
}
