#include<iostream>
using namespace std;  
main() {
    int w,x,y,z,a;
    int i;
    i=0;
    cin>>w;
    for(int b=1;b<=w;b++)
    {
        cin>>x>>y>>z>>a;
        {
            if(a-z==y-x)
            {
                i=a+(y-x);
                cout<<x<<" "<<y<<" "<<z<<" "<<a<<" "<<i<<endl;
            }
            if(a/z==y/x)
            {
                i=a*(a/z);
                cout<<x<<" "<<y<<" "<<z<<" "<<a<<" "<<i<<endl;
            }
        }
    }
    return 0;
}

2 3 4 5

3 / 2 = 1

5 / 4 = 1 

#include<stdio.h>
main()
{
    int n;
    while(scanf("%d", &n)==1)
    {
        int num[n][5];
        for(int i=0; i<n; i++)
        {
            scanf("%d%d%d%d", &num[i][0], &num[i][1], &num[i][2], &num[i][3]);
            if(num[i][1] - num[i][0] == num[i][2] - num[i][1])
                num[i][4]=num[i][3] + num[i][2] - num[i][1];
            else if(num[i][1] / num[i][0] == num[i][2] / num[i][1])
                num[i][4]=num[i][3] * num[i][2] / num[i][1];
        }
        for(int i=0; i<n; i++)
            printf("%d %d %d %d %d\n", num[i][0], num[i][1], num[i][2], num[i][3], num[i][4]);
    }
    return 0;
}