很简单 | AC代码

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

int z(int n, int k)
{
    int cnt = 0,t;
    while(cnt != k)
    {
        int o = n % 10;
        cnt++;
        n /= 10;
        t = o;
    }
    return t;
}

int main()
{
    int k,n;
    cin >> n >> k;
    cout << z(n,k);
    return 0;
}