Răspuns:
#include<iostream>
using namespace std;
int main() {
const int NUM = 100001;
const int MUM = 500002;
int n, m, v[MUM], x[NUM], f[NUM], p[NUM];
cin >> n;
for (int i = 1; i <= n; ++i) {
cin >> v[i];
++f[v[i]];
if (f[v[i]] == 1)
p[v[i]] = i;
}
cin >> m;
for (int i = 1; i <= m; ++i) {
cin >> x[i];
}
for (int i = 1; i <= m; ++i) {
cout << p[x[i]] << " ";
}
return 0;
}