全RE求助

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int s[10001];
void charu(int s[], int n)
{
    for (int k = n / 2; k > 0; k /= 2)
    {
        for (int i = k; i < n; i++)
        {
            int c = s[i];
            int j=i;
            while (j >= k && s[j - k] > c)
            {
                s[j] = s[j - k];
                j-=k;
            }
            s[j] = c;
        }
    }
}
int main()
{
    int s[10001];
    int a, b;
    scanf("%d%d", &a, &b);
    for (int i = 0; i < a; i++)
    {
        scanf("%d",&s[i]);
    }
    charu(s, a);
    if (b >= 0 && b < a) {
        printf("%d", s[b]);
    }
    return 0;
}