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  1. #include<iostream>
  2. #include<iomanip>
  3. #include<algorithm>
  4. #include<vector>
  5. #include<utility>
  6. #include<set>
  7. #include<unordered_set>
  8. #include<list>
  9. #include<iterator>
  10. #include<deque>
  11. #include<queue>
  12. #include<stack>
  13. #include<set>
  14. #include<bitset>
  15. #include<random>
  16. #include<map>
  17. #include<unordered_map>
  18. #include<stdio.h>
  19. #include<complex>
  20. #include<math.h>
  21. #include<cstring>
  22. #include<chrono>
  23.  
  24. #define lb lower_bound
  25. #define ub upper_bound
  26. #define ll long long
  27. #define pb push_back
  28. #define ppb pop_back
  29. #define fi first
  30. #define se second
  31. #define all(x) (x).begin(), (x).end()
  32.  
  33. const int mod = 1e9 + 7;
  34.  
  35. using namespace std;
  36.  
  37. int main(){
  38.  
  39.     ios_base::sync_with_stdio(false);
  40.     cin.tie(NULL);
  41.  
  42.     #ifndef ONLINE_JUDGE
  43.     freopen("input1.txt" , "r" , stdin);
  44.     freopen("output1.txt", "w", stdout);
  45.     #endif
  46.  
  47.     int t;
  48.     cin >> t;
  49.     while(t--){
  50.         int n;
  51.         cin >> n;
  52.         vector<int> a(n);
  53.         for(int i = 0; i < n; i++) cin >> a[i];
  54.  
  55.         vector<int> idx(n + 1, 0);
  56.         for(int i = 0; i < n; i++){
  57.             if(i != a[i]) idx[i] = 1;
  58.         }
  59.  
  60.         int mn = 0;
  61.         for(int i = 0; i < n; i++){
  62.             if(idx[i]){
  63.                 mn = i;
  64.                 break;
  65.             }
  66.         }
  67.  
  68.         int ans = mn;
  69.         for(int i = 0; i < n; i++){
  70.             if(idx[i]){
  71.                 ans &= a[i];
  72.             }
  73.         }
  74.         cout << ans << endl;
  75.     }
  76.  
  77.  
  78.  
  79.  
  80.     return 0;
  81. }
  82.  
Time limit exceeded #stdin #stdout 5s 5552KB
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C++14 (gcc 8.3)
created:
2 years ago
visibility:
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