学步园

#include <iostream>
using namespace std;

int main()
{
    int tc, num[5], tmp[3];
    cin >> tc;
    while (tc--)
    {
        cin >> num[0] >> num[1] >> num[2] >> num[3];  
        tmp[0] = num[1] - num[0];
        tmp[1] = num[2] - num[1];
        tmp[2] = num[3] - num[2];
        if (tmp[0] == tmp[1] && tmp[1] == tmp[2])
        {
            num[4] = num[3] + tmp[0];
            for (int i = 0; i < 5; i++)
            {
                if (i)
                   cout << " ";
                cout << num[i];
            } 
            cout << endl;
        }
        else
        {
            num[4] = (num[3] * num[3])/num[2];
            for (int i = 0; i < 5; i++)
            {
                if (i)
                   cout << " ";
                cout << num[i];
            } 
            cout << endl;
        }
    }
    
    system("pause");
}