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  1. #include <stdio.h>
  2. int main(){
  3.     int n, k;
  4.     scanf("%d %d", &n, &k);
  5.     int x;
  6. 	double sum = 0;
  7. 	int count = 0;
  8.  
  9.     for (int i = 1; i <= n; i++){
  10.         scanf("%d", &x);
  11.  
  12.         if(i % k == 0){
  13.             sum += x;
  14.             count++;
  15.         }
  16.     }
  17. if(count == 0){
  18.     printf("0.00\n");
  19. }else{
  20.     printf("%.2lf\n", sum/count);
  21. }
  22.     return 0;
  23. }
Success #stdin #stdout 0s 5288KB
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stdin
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7 2
10 20 30 40 50 60 70
stdout
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40.00
https://ideone.com/XSojAZ
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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