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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int n,k;
  5.    scanf("%d %d",&n,&k);
  6.    getchar()!='\n';
  7.    int a[n],i=0,f=n-1;
  8.    for(i;i<n;i++)
  9.    {
  10.        scanf("%d",&a[i]);
  11.        getchar()!='\n' && ' ';
  12.    }
  13.    long long int p=a[f];
  14.    while(1)
  15.    {
  16.        p*=a[f-=k];
  17.        if(a[f]-a[0]<=k)
  18.         break;
  19.    }
  20.    printf("%d\n",p);
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 2116KB
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stdin
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6 3
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stdout
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18
https://ideone.com/JwC46i
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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