#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("distante.in");
ofstream fout("distante.out");
int v[50005];
int main()
{
    int f,n,m,s,ok=0;
    int a,b,c;
    fin>>f;
    for(int i=1;i<=f;++i)
    {
        fin>>n>>m>>s;
        for(int j=1;j<=n;++j)
            fin>>v[j];
        ok =! v[s];
        for(int j=1;j<=m;++j)
        {
            fin>>a>>b>>c;
            if(ok)
                ok =!(v[a] + c < v[b] || v[b] + c < v[a]);
        }
        fout<<(ok? "DA\n" : "NU\n");
    }
    return 0;
}