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  1. #include <bits/stdc++.h>
  2. #define int long long
  3. using namespace std;
  4.  
  5. void solve() {
  6.     int x;
  7.     cin >> x;
  8.     int y=0;
  9.  
  10.     for(int i=0;i<32;i++){
  11.     	if((x&(1<<i))){
  12.     		y=(y^(1<<i));
  13.     		break;
  14.     	}
  15.     }
  16.     for(int i=0;i<32;i++){
  17.     	if((x&(1<<i))==0){
  18.     		y=(y^(1<<i));
  19.     		break;
  20.     	}
  21.     }
  22.     if(y>=x){
  23.     	cout<<-1<<endl;
  24.     }
  25.     else{
  26.     	cout<<y<<endl;
  27.     }
  28.  
  29.  
  30.  
  31.  
  32. }
  33.  
  34. signed main() {
  35.     int t;
  36.     cin >> t;
  37.     while (t--) {
  38.         solve();
  39.     }
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0.01s 5272KB
comments (?)
stdin
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7
5
2
6
3
69
4
420
stdout
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3
-1
3
-1
3
-1
5
https://ideone.com/3Htg3O
language:
C++ (gcc 8.3)
created:
17 hours ago
visibility:
public

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