#include <fstream>
 
using namespace std;
 
ifstream fin("distante.in");
ofstream fout("distante.out");
 
int N, M, S, dists[50005];
 
void Solve()
{
    fin >> N >> M >> S;
 
    for(int i = 1; i <= N; i++)
        fin >> dists[i];
 
    int x, y, c;
    bool isOk = true;
    for(int i = 1; i <= M; i++)
    {
        fin >> x >> y >> c;
 
        if(dists[x] + c < dists[y] || dists[y] + c < dists[x])
            isOk = false;
    }
 
    if(dists[S] != 0 || isOk == false)
        fout << "NU\n";
    else
        fout << "DA\n";
}
 
int main()
{
    int T;
    fin >> T;
 
    while(T--)
        Solve();
 
    return 0;
}