#include<fstream>
using namespace std;
ifstream f("distante.in");
ofstream g("distante.out");
int d[50003],i,j,k,n,m,s,t,o;
int main()
{
    f>>t;
    for(;t;--t) {
        f>>n>>m>>s;
        for(i=1;i<=n;++i)
            f>>d[i];
        o=1;
        if(d[s])
            o=0;
        for(;m;--m) {
            f>>i>>j>>k;
            if(d[i]+k<d[j]||d[j]+k<d[i])
                o=0;
        }
        if(o)
            g<<"DA\n";
        else
            g<<"NU\n";
    }
    return 0;
}