C++ 알고리즘 - 백준 10816 숫자 카드 2 (unordered_map)

https://www.acmicpc.net/problem/10816

 

#include <bits/stdc++.h>
#include <unordered_map>
#define endl "\n"

using namespace std;

int main(void) {
	// C++ Init
	ios::sync_with_stdio(false);
	cin.tie(NULL);

	int input1, input2;
	unordered_map<int, int> um;

	cin >> input1;

	for (int i = 0; i < input1; i++) {
		cin >> input2;
		um[input2]++;

	}

	cin >> input1;
	for (int i = 0; i < input1; i++) {
		cin >> input2;
		cout << um[input2] << " ";
	}
}