#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a, b;
    cin >> a >> b;
    char c[100];
    _itoa(a, c, b);
    for (int i = 0; i < strlen(c); i++)
    {
        if (c[i] >= 'a' && c[i] <= 'z')
            c[i] = c[i] - 'a' + 'A';
    }
    printf("%s", c);
    return 0;
}

这洛谷就不能自定义编译参数么