백준 1475번 C++

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;
int num[9];

int main(void) {
	string s;
	int answer = 0;

	cin >> s;
	for (int i = 0; i < s.length(); i++) {
		if (s[i] == '6' || s[i] == '9') {
			num[6] ++;
			answer = max(answer, (num[6])/2 + num[6]%2);
		}
		else {
			num[s[i] - '0'] ++;
			answer = max(answer, num[s[i] - '0']);
		}
	}
	cout << answer << endl;
	return 0;
}