#include<fstream>
using namespace std;
ifstream f("distante.in");
ofstream g("distante.out");
int ok,t,n,m,s,i,j,b[50010],x,y,c;
int main()
{     
    f>>t;
    while(t--)
	{
        ok=1;
        f>>n>>m>>s;
        for(i=1;i<=n;i++)
			f>>b[i];
        if(b[s]!=0)
			ok=0;
        while(m--)
		{
            f>>x>>y>>c;
            if(b[x]>b[y]+c||b[y]>b[x]+c)
				ok=0;
        }
        if(ok)
			g<<"DA";
		else
			g<<"NU";
		g<<"\n";
    }
    return 0;
}