代码

#include <iostream>
#include <bits/stdc++.h>
using namespace std;

void ftovec(string s, vector<int> &a) {
	reverse(s.begin(), s.end());
	for (int i = 0; i < s.size(); i++) {
		a[i] = s[i] - '0';
	}
}

void div(vector<int>a, int b, vector<int> &c, int &yu) {
	yu = 0;
	for (int i = c.size() - 1; i >= 0; i--) {
		c[i] = (yu * 10 + a[i]) / b;
		yu = (yu * 10 + a[i]) % b;
	}
	while (c.back() == 0 && c.size() > 1) {
		c.pop_back();
	}
	reverse(c.begin(), c.end());
}

int main() {
	string a1;
	int b;
	cin >> a1 >> b;
	vector<int>a(a1.size(), 0), c(a1.size(), 0);
	ftovec(a1, a);
	int yu = 0;
	div(a, b, c, yu);

	for (int i : c) {
		cout << i;
	}
//	cout << "\n余数：" << yu;

	return 0;
}

评测结果