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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4.  ll A[100005];
  5.  int main()
  6. {
  7.  
  8.     ll t;
  9.     cin>>t;
  10.     while(t--)
  11.     {
  12.         ll n;
  13.         cin>>n;
  14.     //    ll A[n];
  15.         for(ll i=0;i<n;++i)
  16.         {
  17.             cin>>A[i];
  18.         }
  19.             ll result=0;
  20.             for(ll k=0;k<n;++k)
  21.             {
  22.                 result = __gcd(A[k],result);
  23.             }
  24.         if(result==(ll)1)
  25.         {
  26.             cout<<n<<endl;
  27.         }
  28.         else
  29.         cout<<"-1"<<endl;
  30.     }
  31.     return 0;
  32. }
Success #stdin #stdout 0s 16016KB
comments (?)
stdin
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2
2
7 2
3
2 2 4
stdout
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2
-1
https://ideone.com/MktRzG
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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