#include <fstream>
#include <queue>
#define in "distante.in"
#define out"distante.out"
#define Max_Size 500009

std :: ifstream f(in);
std :: ofstream g(out);

int T, N, M, S;
int D[Max_Size];

int main()
{
    int a, b, c;

    f >> T;
    while(T --)
    {
        bool ok = 1;

        f >> N >> M >> S;
        for(int i = 1; i <= N; ++i) f >> D[i];

        for(int i = 1; i <= M; ++i)
        {
            f >> a >> b >> c;
            if(D[a] + c < D[b] || D[b] + c < D[a])
                ok = 0;
        }
        if(D[S])        ok = 0;

        if(ok)  g << "DA\n";
        else    g << "NU\n";
    }

    g.close();
    return 0;
}