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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int t, n;
  7. 	long long cnt, r;
  8. 	string s;
  9. 	scanf("%d", &t);
  10. 	while(t--) {
  11. 		r=0;
  12. 		cnt=0;
  13. 		scanf("%d", &n);
  14. 		cin>>s;
  15. 		for(int i=0; i<s.length(); i++) if(s[i]=='1') cnt++;
  16. 		while(cnt>0) r+=cnt, cnt--;
  17. 		printf("%lld\n", r);
  18. 	}
  19.  	return 0;
  20. }
Success #stdin #stdout 0s 3432KB
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stdin
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1
10
0000000001
stdout
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1
https://ideone.com/ET04pJ
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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