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  1. #include <bits/stdc++.h>
  2.  
  3. #define Khashwaa() ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
  4. #define ulld unsigned long long
  5. #define itn int
  6. #define endl '\n'
  7. #define lld long long
  8. #define fix(n) fixed << setprecision(n)
  9. #define gcd(x,y) __gcd(x, y)
  10. #define lcm(x,y) (x/(__gcd(x,y))*y)
  11. #define all(v)  v.begin(),v.end()
  12. #define rall(v) v.rbegin(),v.rend()
  13. #define Uint  unsigned int
  14. #define tostr(n,s) ostringstream St;St<<n;string s=St.str();
  15. void mini(lld &a, lld b) { a = std::min(a, b); }
  16. void maxi(lld &a, lld b) { a = std::max(a, b); } 
  17. int dx[] = { 1, 0, -1, 0 }; 
  18. int dy[] = { 0, -1, 0, 1 };
  19.  
  20. const lld N = 1e6 + 7;
  21. const lld MOD = 1e9 + 7;
  22.  
  23. using namespace std;
  24.  
  25. void _Function()
  26. {
  27. 	int n;cin >> n;
  28. 	vector<int> a(n);
  29. 	for (int i = 0;i < n; ++i) cin >> a[i];
  30. 	int x = -1;
  31. 	for (int i = 0;i < n; ++i){
  32. 		if(a[i] != i){
  33. 			x = max(x , a[i] & i);
  34. 		}
  35. 	}
  36. 	cout << x << endl;
  37. }
  38. int32_t main()
  39. {
  40.     Khashwaa();
  41.     int t = 1;cin >> t;
  42.     while(t--){
  43.         _Function();
  44.     }
  45. }
  46.  
Success #stdin #stdout 0.01s 5300KB
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https://ideone.com/pDpKkH
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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