Submission #2120108

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Source Code Expand

#include <stdio.h>
void quicksort (int x[], int l, int r);
void swap (int x[], int a, int b);

int main(){
  int n, k;
  int r[110];
  double c = 0;

  scanf("%d%d", &n, &k);
  for (int i = 0; i < n; i++) scanf("%d", &r[i]);
  quicksort (r, 0, n);

  for (int i = 0; i < k; i++) c = (c + (double)r[n-k+i])/2;
  printf("%lf", c);
  return 0;
}

void quicksort (int x[], int l, int r) {
  int p = (r + l)/2;
  int i = l, j = r;

  for (; j > i; i++) {
    if (x[i] >= x[p]) {
      for (; j > i; j--) {
        if (x[p] > x[j]) {
          swap(x, i, j);
          break;
        }
      }
    }
  }

  if (i - l >= 2) quicksort (x, l, i - 1);
  if (r - j >= 2) quicksort (x, j + 1, r);
}

void swap (int x[], int a, int b) {
  int temp;
  temp = x[a];
  x[a] = x[b];
  x[b] = temp;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:10:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &n, &k);
   ^
./Main.c:11:31: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   for (int i = 0; i < n; i++) scanf("%d", &r[i]);
                               ^

Judge Result