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#include <iostream>
#include <cstdio>

using namespace std;

int main()
{

    //freopen("uvainput.txt", "r", stdin);
    //freopen("uvaoutput.txt", "w", stdout);

    int t,tt;
    scanf("%d",&tt);

    int x,y,z,ave,over,r;

    for(t=0; t<tt; t++)
    {
        scanf("%d%d%d",&x,&y,&z);

        ave=(x+y)/3;
        over = x-ave;
        r= z*over/ave;

        printf("%d\n",r);


    }


    return 0;
}

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1
1 1 1

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#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <string.h>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <cctype>
#include <stack>
#include <queue>
#include <map>
#include <vector>


using namespace std;

int main()
{
    double i,j,k,t_case,f1,f2,money,dif,tmp;
    int f1_money ;
    cin >> t_case ;
    for(i = 1 ; i <= t_case ; i++)
    {
        dif = 0 ;
        cin >> f1 >> f2 >> money ;
        if(f1 > f2)
            dif = f1 - f2 ;

        tmp = (money / (f1 + f2));
        f1_money = (tmp * (f1 + dif)) ;
        cout << f1_money << endl ;
    }
    return 0;
}

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Input:
3
6 7 50
3 9 120
11 11 987
your code says:
23
30
246

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19
0
493

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Accepted !