上海交通大学机试 整除问题 Easy

#include<iostream>
#include<vector>
#include<algorithm>
#include<math.h>
#include<string>
using namespace std;

void mutlip(string &s, int n) {
	int carry = 0;
	for (int i = 0; i < s.size(); i++) {
		int temp = (s[i] - ‘0‘)*n + carry;
		s[i] = temp % 10+‘0‘;
		carry = temp / 10;
	}
	while (carry != 0) {
		s += char(carry % 10+‘0‘);
		carry /= 10;
	}
}

int devide(string &s, int n, int r) {
	string res = s;
	for (int i = s.size() - 1; i >= 0; i--) {
		int temp = (s[i] - ‘0‘) + r * 10;
		res[i] = char(temp / n + ‘0‘);
		r = temp % n;
	}
	while (res.size() > 0 && res[res.size() - 1] == ‘0‘)
		res.pop_back();
	s = res;
	return r;
}

int main() {
	int a, b;
	while (cin >> a >> b) {
		string jc = to_string(a);
		for (int i = a - 1; i > 0; i--) {
			mutlip(jc, i);
		}
		int cnt = 0;
		while (devide(jc, b, 0) == 0) {
			cnt++;
		}
		cout << cnt << endl;
	}
}