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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void solve (int tc) {
  5. 	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
  6. 	int n = 1000, iterations = 1000;
  7.  
  8. 	int favorable = 0, total = 0;
  9. 	while (iterations--) {
  10. 		set<int> s;
  11. 		for (int i = 1; i <= n; i++)
  12. 			s.insert(i);
  13.  
  14. 		while (s.size() > 1) {
  15. 			vector<int> curr(s.begin(), s.end());
  16. 			int n = curr.size();
  17.  
  18. 			set<int> killed;
  19.  
  20. 			for (int i = 0; i < n; i++) {
  21. 				int j = rng() % (n - 1);
  22. 				if (j >= i)
  23. 					j++;
  24.  
  25. 				killed.insert(curr[j]);
  26. 			}
  27.  
  28. 			for (int i : killed)
  29. 				s.erase(i);
  30. 		}
  31.  
  32. 		total++;
  33. 		if (s.size() == 1)
  34. 			favorable++;
  35. 	}
  36.  
  37. 	cout << (double)favorable / (double)total << '\n';
  38. }
  39.  
  40. signed main () {
  41. 	int t = 1;
  42. 	// cin >> t;
  43. 	for (int i = 1; i <= t; i++) {
  44. 		solve(i);
  45. 	}
  46.  
  47. 	return 0;
  48. }
Success #stdin #stdout 0.42s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
0.463
https://ideone.com/Itr0um
language:
C++14 (gcc 8.3)
created:
8 days ago
visibility:
public

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