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  1. #include <cstdio>
  2. #include <iostream>
  3. #include <cstdlib>
  4. #include <vector>
  5. #define f(i,a,b) for(int i=a;i<b;++i)
  6. using namespace std; 
  7. int main()
  8. { int t; cin>>t;
  9.   f(i,0,t)
  10.   { int k=2;int tam;cin>>tam;
  11.     vector<int> v(tam);
  12.     f(j,0,tam)
  13.     cin>>v[j];
  14.     if (tam==1)
  15.      k=-1;
  16.     else
  17.     { int c=v[0]-v[1];
  18.        f(r,0,tam-1)
  19.        { if (v[r]-v[r+1]!=c) {k--;break;}
  20.         }
  21.        f(r,0,tam-1)
  22.        { if (v[r]*v[1]!=v[r+1]*v[0]) {k--;break;}
  23.        }
  24.      }
  25.      if (k==2&&v[0]==v[1])  k=1;
  26.      cout<<k<<endl;
  27.     }
  28.    return 0;
  29. }
Success #stdin #stdout 0s 3480KB
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stdout
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https://ideone.com/SvCnWW
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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