794. 高精度除法

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

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 a;
    int b, r;
    cin >> a >> b;

    vector<int> A;
    for (int i = a.size() - 1; i >= 0; -- i)    A.push_back(a[i] - '0');
    
    auto C = div(A, b, r);
    
    for (int i = C.size() - 1; i >= 0; -- i)    cout << C[i];
    
    cout << endl << r << endl;
    
    return 0;
}