a005. Eva 的回家作業

#include<iostream>
using namespace std;

int main()
{
    int in[4],a=0;
    cin>>a;
    while(cin>>in[0]>>in[1]>>in[2]>>in[3])
    {
        if((in[2]-in[1]==in[3]-in[2])&&(in[1]-in[0]==in[3]-in[2]))
            {
                cout<<in[0]<<" "<<in[1]<<" "<<in[2]<<" "<<in[3]<<" "<<in[3]+(in[2]-in[1])<<endl;
            }
        else
            {

                cout<<in[0]<<" "<<in[1]<<" "<<in[2]<<" "<<in[3]<<" "<<in[3]*(in[2]/in[1])<<endl;
            }
    }
}