[C++] 백준 14912번 숫자 빈도수

#include <iostream>
#include <string>
using namespace std;

int main() {

	int n;
	char digit;
	cin >> n >> digit;
	int repeated = 0;

	for (int i = 0; i < n; i++) {
		string num = to_string(i + 1);
		for (int k = 0; k < num.length(); k++) {
			if (num[k] == digit)
				repeated++;
		}
	}
	
	cout << repeated << "\n";

	return 0;
}