#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");
    fscanf(in,"%d",&T);
    for(q=1;q<=T;q++)
    {
        fscanf(in,"%d %d %d",&n,&m,&S);
        for(i=1;i<=n;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);
            if(dist[x]+cost<dist[y] || dist[y]+cost<dist[x])
            {
                ok=false;
            }
        }
        if(ok)
            fprintf(out,"DA\n");
        else
            fprintf(out,"NU\n");
    }
    fclose(in);
    fclose(out);

    return 0;
}