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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int n, k, a[100005];
  4. void solve() {
  5.     cin >> n >> k; 
  6. 	for(int i=0; i<n; i++) cin >> a[i];
  7. 	long long ans = 0;
  8. 	sort(a, a + n); 
  9. 	for (int i = 0; i < n-1; i++) {  
  10. 	    ans = ans + upper_bound(a+i+1,a+n,k+a[i]-1) - a-i-1;
  11. 	} 
  12. 	cout << ans << endl;
  13. }
  14. int main() {
  15. 	int t; cin >> t;
  16.     while(t--) solve();
  17. 	return 0;
  18. }
Success #stdin #stdout 0.04s 4304KB
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https://ideone.com/ZXpwRl
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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