E - 求平均成绩

#include<stdio.h>
int  main()
{
  int i,q,j,n,m;
  while (~scanf("%d%d", &n, &m))
  {
    float a[100][100];
    float xs[100], kc[100];
    float sum = 0;
    int nb = 0, nnb = 0;
    for (i = 0; i < n; i++)
      for (j = 0; j < m; j++)
      {
        scanf("%f", &a[i][j]);
      }
    for (i = 0; i < n; i++)
    {
      for (j = 0; j < m; j++)
      {
        sum = sum + a[i][j];
      }
      xs[j]= sum / m;
      printf("%.2f ", xs[j]);
      sum = 0;
    }
    printf("\n");
    for (q=0,j = 0; j < n; j++,q++)
    {
      for (i = 0; i < m; i++)
      {
        sum = sum + a[i][j];
      }
      kc[q] = sum / n;
      printf("%.2f ", kc[q]);
      sum = 0;
    }
    printf("\n");
    for (i = 0; i < n; i++)
    {
      for (q=0,j = 0; j < m; j++,q++)
      {
        if (a[i][j] > kc[q])
          nb++;
      }
      if (nb == m)
        nnb++;
    }
    printf("%d\n", nnb);
  }
  return 0;
}