#include <fstream>
using namespace std;
ifstream in("distante.in");
ofstream out("distante.out");
const int NMAX = 50002;
int d[NMAX];
bool test() {
    int n, m, s;
    in >> n >> m >> s;
    for (int i = 1; i <= n; i ++)
        in >> d[i];
        bool R = 0;
    if (d[s] != 0) R = 1;
    int a, b, c;
    for (int i = 1; i <= m; i ++) {
        in >> a >> b >> c;
        if (d[a] + c < d[b] || d[b] + c < d[a])
            R = 1;
    }
    return R;
}
int main()
{
    int t;
    in >> t;
    while (t --)
        if (!test())
            out << "DA\n";
        else
           out << "NU\n";
    return 0;
}