#include<fstream>
using namespace std;
ifstream f("distante.in");
ofstream g("distante.out");
int t,i,n,ok,m,s,c,x,y,d[50001];
int main()
{
    f>>t;
    for(;t;--t)
    {
        f>>n>>m>>s;
        for(i=1;i<=n;++i)
        f>>d[i];
        ok=1;
        for(i=1;i<=m;++i)
        {
            f>>x>>y>>c;
            if(d[x]+c<d[y])
            ok=0;
        }
        if(d[s])
        ok=0;
        if(ok)
        g<<"DA\n";
        else
        g<<"NU\n";
    }
    return 0;
}