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OI-codes/AtCoder/ABC235/C/C.cpp

29 lines
555 B
C++

#include <iostream>
#include <unordered_map>
#include <vector>
using std::cin;
using std::cout;
using std::endl;
int n, q, a, x, k;
std::unordered_map<int, std::vector<int>> map;
int main() {
std::ios::sync_with_stdio(false);
cin >> n >> q;
for (int i = 1; i <= n; i++) {
cin >> a;
map[a].push_back(i);
}
while (q--) {
cin >> x >> k;
if (!map.count(x) || map[x].size() < k) {
cout << -1 << endl;
} else {
cout << map[x][k - 1] << endl;
}
}
return 0;
}