COSO667 C++

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

int n,r;

void nhap()
{
    cin>>n>>r;
}
void giai()
{
    int d=0,x,a[100000];
    while(n>0)
    {
        x=n%r;
        d++;
        a[d]=x;
        n=n/r;
    }
    for(int i=d;i>=1;i--) cout<<a[i];
}

int main()
{
    freopen("coso667.inp","r",stdin);
    freopen("coso667.out","w",stdout);
    nhap();
    giai();
}