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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int n, d, x[100005];
  7. 	long long int ans=0;
  8. 	scanf("%d%d", &n, &d);
  9. 	for(int i=0; i<n; i++) scanf("%d", x+i);
  10. 	for(int i=0, j=0; i<n; i++) {
  11. 		while(x[i]-x[j]>d) j++;
  12. 		ans+=(long long)(i-j)*(i-j-1)/2;
  13. 	}
  14. 	printf("%lld", ans);
  15. }
Success #stdin #stdout 0s 3608KB
comments ()
stdin
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10 50
1 4 20 27 65 79 82 83 99 100
stdout
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25
https://ideone.com/N2cHDh
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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