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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(int argc, char **argv) {
  5. 	int t;
  6. 	scanf("%d", &t);
  7. 	while (t-- != 0) {
  8. 		int n, freq[26] = { };
  9. 		char s[21];
  10. 		scanf("%d%s", &n, s);
  11. 		for (int i = 0; i < n; ++i)
  12. 			++freq[s[i] - 'a'];
  13. 		int odd = 0;
  14. 		for (int i = 0; i < 26; ++i)
  15. 			if ((freq[i] & 1) == 1)
  16. 				++odd;
  17. 		if (odd > 1) {
  18. 			puts("0");
  19. 			continue;
  20. 		}
  21. 		string z = "";
  22. 		for (int i = 0; i < 26; ++i)
  23. 			z += string(freq[i] >> 1, char(i + 'a'));
  24. 		int res = 0;
  25. 		do {
  26. 			++res;
  27. 		} while (next_permutation(z.begin(), z.end()));
  28. 		printf("%d\n", res);
  29. 	}
  30. 	return 0;
  31. }
Runtime error #stdin #stdout 0s 15240KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/zaXvKc
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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