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  1. #include <stdio.h>
  2.  
  3. #define FOR(i, n) for (int i=0; i<n; i++)
  4.  
  5. void run(void) {
  6. 	int n;
  7. 	char a[17], b[17];
  8. 	scanf("%d %s %s", &n, a, b);
  9. 	FOR(i, n)
  10. 		a[i] -= 'a', b[i] -= 'a';
  11.  
  12. 	int res = 26;
  13. 	FOR(i, 1 << (n - 1)){
  14. 		int mask = i;
  15. 		int ma = 0, mb = 0; // character masks
  16. 		for (int j=0; j<n; j++, mask /= 2)
  17. 			if (mask % 2) // swap j-th character
  18. 				ma |= (1 << b[j]), mb |= (1 << a[j]);
  19. 			else
  20. 				mb |= (1 << b[j]), ma |= (1 << a[j]);
  21.  
  22. 		int cnta = 0, cntb = 0;
  23. 		for (; ma | mb; ma /= 2, mb /= 2)
  24. 			cnta += ma % 2, cntb += mb % 2;
  25.  
  26. 		cnta = (cnta > cntb) ? cnta : cntb;
  27. 		res = (res < cnta) ? res : cnta;
  28. 	}
  29.  
  30. 	printf("%d\n", res);
  31. }
  32. int main(void) {
  33. 	int t;
  34. 	scanf("%d", &t);
  35. 	while (t--)
  36. 		run();
  37. 	return 0;
  38. }
Success #stdin #stdout 0.63s 9432KB
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https://ideone.com/l0f7T9
language:
C99 (gcc 8.3)
created:
7 years ago
visibility:
secret

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