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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <cmath>
  4. #include <vector>
  5. #include <unordered_map>
  6. #include <map>
  7. #include <unordered_set>
  8. #include <set>
  9. #include <queue>
  10. #include <stack>
  11. #include <iomanip>
  12. #include <cstdlib>
  13. #include <fstream>
  14. #include <ctime>
  15. #include <random>
  16.  
  17. #define int long long
  18.  
  19. using namespace std;
  20.  
  21. const int INF = 1e18;
  22. int n, ans, p[200005];
  23. vector < int > a;
  24.  
  25. void pereb(int step)
  26. {
  27.     if(step == n)
  28.     {
  29.         int inv = 0;
  30.         for(int i = 0; i < n; i++)
  31.             for(int j = i + 1; j < n; j++)
  32.                 inv += (a[i] > a[j]);
  33.         ans = min(ans, inv);
  34.         return;
  35.     }
  36.     vector < int > cur = a;
  37.     a.push_back(p[step]);
  38.     pereb(step + 1);
  39.     a = {p[step]};
  40.     for(auto i : cur)
  41.         a.push_back(i);
  42.     pereb(step + 1);
  43.     a = cur;
  44.     return;
  45. }
  46.  
  47. main()
  48. {
  49.     ios_base::sync_with_stdio(0);
  50.     cin.tie(0);
  51.     int t;
  52.     cin >> t;
  53.     while(t--)
  54.     {
  55.         cin >> n;
  56.         for(int i = 0; i < n; i++)
  57.             cin >> p[i];
  58.         ans = INF;
  59.         pereb(0);
  60.         cout << ans << '\n';
  61.     }
  62.     return 0;
  63. }
  64.  
Runtime error #stdin #stdout 0.01s 5440KB
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https://ideone.com/BFO86B
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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