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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	long long int t, n, a;
  7. 	scanf("%lld", &t);
  8. 	while(t--) {
  9. 		scanf("%lld", &n); 
  10. 		for(int i=0; i<n; i++) scanf("%lld", &a); 
  11. 		printf("%lld\n", n*(n-1)/2);
  12. 	}
  13. 	return 0;
  14. }
Success #stdin #stdout 0s 3344KB
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stdin
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2
2
2 1
3
3 1 2
stdout
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1
3
https://ideone.com/K6W4bu
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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