#include<fstream>
using namespace std;
ifstream f("distante.in");
ofstream g("distante.out");
int t,n,m,i,s,d[50005],x,y,c,ok;

int main()
{
    f>>t;
    while(t-->0)
    {
      f>>n>>m>>s;
       ok=1;
        for(i=1;i<=n;++i) f>>d[i];
        if(d[s]!=0) ok=0;
        for(i=1;i<=m;++i){
            f>>x>>y>>c;
            if(d[x]+c<d[y]) ok=0;
            if(d[y]+c<d[x]) ok=0;
        }
        if(ok==1) g<<"DA\n";
          else g<<"NU\n";
    }
}