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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. void solve() {
  6. 	int n;
  7. 	cin >> n;
  8. 	map<int, int> cnt;
  9. 	for(int i = 0; i < n; i++) {
  10. 		int ai;
  11. 		cin >> ai;
  12. 		cnt[ai]++;
  13. 	}
  14. 	cout << cnt[0] * (cnt[0] - 1) / 2 + cnt[2] * (cnt[2] - 1) / 2 << endl;
  15. }
  16.  
  17. signed main() {
  18. 	int t;
  19. 	cin >> t;
  20. 	while(t--) {
  21. 		solve();
  22. 	}
  23. }
  24.  
Success #stdin #stdout 0.05s 4256KB
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https://ideone.com/Fgcn8U
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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