HDU-5982-Relic Discovery

#include <iostream>

using namespace std;

int n;

int main()
{
    int T;
    scanf("%d", &T);

    while (T--)
    {
        scanf("%d", &n);

        int sum = 0, x, y;
        for (int i = 0; i < n; i++)
        {
            scanf("%d%d", &x, &y);

            sum += x * y;
        }

        printf("%d\n", sum);
    }

    return 0;
}