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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main(){
  4.     int t;
  5.     cin>>t;
  6.     while(t--){
  7.         long long n;
  8.         cin>>n;
  9.         long long x = n;
  10.         bool flag = false;
  11.         while(x--){
  12.             long long ans = x^n;
  13.             if(x+n>ans && x+ans>n && n+ans>x){
  14.                 flag = true;
  15.                 break;
  16.             }
  17.         }
  18.         if(flag){
  19.             cout<<x<<endl;
  20.         }else{
  21.             cout<<"-1"<<endl;
  22.         }
  23.     }
  24. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
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7
5
2
6
3
69
4
420
stdout
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3
-1
5
-1
67
-1
419
https://ideone.com/leyttC
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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