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

ifstream fin("distante.in");
ofstream fout("distante.out");

int t , n ,m ,s ;

int  main()
{

    fin >> t;
    while ( t)
    {
        fin>>n>>m>>s;
        vector<int> v(n+1);

        for(int i=1;i<=n;i++)
            fin>>v[i];
        int ok=1;
        int a,b,c;
        if(v[s])
            ok=0;
        for(;m;--m)
        {
            fin>>a>>b>>c;
            if(v[a]>v[b]+c || v[b]>v[a]+c)
                ok=0;

        }
        if(ok)
            fout<<"DA"<<endl;
        else
            fout<<"NU"<<endl;
        t--;
    }
    return 0;
}