高精度除法

重点
1. r表示余数， 模拟手动除法，每次除完r都会乘10并加上下一个数作为下一位对除数
2. 除完后对c是逆序存的
3. 需要去除前导0

#include <iostream>
#include <cstring>
#include <algorithm>
#include <vector>
using namespace std;
const int N = 100100;

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

int main() {
    string s;
    int b;
    vector<int> a;
    cin >> s >> b;
    for (int i = s.size() - 1; i >= 0; i--) {
        a.push_back(s[i] - '0');
    }
    int r = 0;
    vector<int> c = div(a, b, r);
    for (int i = c.size() - 1; i >= 0; i--) cout << c[i];
    cout << endl;
    cout << r << endl;


    return 0;
}