1_Tehnokubok

#include <cstdio>
using namespace std;

int main()
{
    int t = 0;
    scanf("%d", &t);

    while (t--)
    {
        int n = 0;
        scanf("%d", &n);

        for (int i = 0; i < n; i += 2)
        {
            int x = 0, y = 0;
            scanf("%d%d", &x, &y);
            printf("%d %d ", -y, x);
        }
    }

    return 0;
}