[BOJ/C++] 25304 영수증

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#include <iostream>

using namespace std;

int main() {
	int X, N;
	cin >> X >> N;
	int a, b;
	for (int i = 0; i < N; i++) {
		cin >> a >> b;
		X -= a * b;
	}
	if (X == 0)
		cout << "Yes";
	else
		cout << "No";
	return 0;
}