//#include<stdio.h>
#include<fstream>
using namespace std;
FILE *in,*out;

int n,m,S,T,i,x,y,cost,q,dist[50001];

int main()
{
    //in=fopen("distante.in","rt");
    //out=fopen("distante.out","wt");
    ifstream in("distante.in");
    ofstream out("distante.out");
    //fscanf(in,"%d",&T);
    in>>T;
    for(q=1;q<=T;q++)
    {
        //fscanf(in,"%d %d %d",&n,&m,&S);
        in>>n>>m>>S;
        for(i=1;i<=n;i++)
            in>>dist[i];
            //fscanf(in,"%d",&dist[i]);
        bool ok=true;
        if(dist[S])
            ok=false;
        for(i=1;i<=m;i++)
        {
            //fscanf(in,"%d %d %d",&x,&y,&cost);
            in>>x>>y>>cost;
            if(dist[x]+cost<dist[y] || dist[y]+cost<dist[x])
            {
                ok=false;
            }
        }
        if(ok)
            out<<"DA\n";
            //fprintf(out,"DA\n");
        else
            out<<"NU\n";
            //fprintf(out,"NU\n");
    }
    //fclose(in);
    //fclose(out);
    in.close();
    out.close();
    return 0;
}