B-2题解

#include <iostream>
#include <math.h>
using namespace std;
void input(int *arr)
{
    for (int i = 0; i < 3; i++)
        cin >> arr[i];
    return;
}
int main()
{
    int T;
    cin >> T;
    while (T--)
    {
        int a[3], b[3];
        input(a), input(b);
        int sum = 0;
        a[2] >= b[1] ? (sum = 2 * b[1], a[2] -= b[1], b[1] = 0) : (sum = 2 * a[2], b[1] -= a[2], a[2] = 0);
        (a[1] -= b[0] + b[1]) > 0 ? ((b[2] -= a[0] + a[2]) > 0 ? sum -= 2 * b[2] : 0) : 0; 
        cout << sum << endl;
    }
    return 0;
}