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  1. // Inversions, by Errichto
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. #define FOR(i,a,b) for(int i = (a); i <= (b); ++i)
  5. #define REP(i,n) FOR(i,0,(n)-1)
  6. #define RI(i,n) FOR(i,1,(n))
  7. typedef long long ll;
  8. const int K = 25;
  9.  
  10. ll ways[1 << K], s[1 << K];
  11.  
  12. ll solve(int n) {
  13. 	REP(i, 1 << n) ways[i] = s[i] = 0;
  14. 	ways[0] = 1;
  15. 	REP(mask, 1 << n) REP(i, n)
  16. 		if(!(mask & (1 << i)))
  17. 			if(__builtin_popcount(mask) != i) {
  18. 				int bigger = 0;
  19. 				FOR(j, i + 1, n - 1) if(mask & (1 << j)) ++bigger;
  20. 				int m2 = mask | (1 << i);
  21. 				ways[m2] += ways[mask];
  22. 				s[m2] += s[mask] + bigger * ways[mask];
  23. 			}
  24. 	return s[(1 << n) - 1];
  25. }
  26.  
  27. int main() {
  28. 	int z;
  29. 	scanf("%d", &z);
  30. 	while(z--) {
  31. 		int n;
  32. 		scanf("%d", &n);
  33. 		printf("%lld\n", solve(n));
  34. 	}
  35. 	return 0;
  36. }
  37.  
Runtime error #stdin #stdout 1.61s 527872KB
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https://ideone.com/FQZYvd
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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