#include<fstream>
using namespace std;
const int inf=16000000;
const int maxn=50001;
ifstream f("distante.in");
ofstream g("distante.out");
int t,a,b,c,n,m,s,i,d[maxn];
bool block[maxn];
int main()
{
    int t;
    f>>t;
    for(;t;--t)
    {
        f>>n>>m>>s;
        for(i=1;i<=n;++i)
        {
            f>>d[i];
            block[i]=0;
        }
        block[s]=1;
        for(;m;--m)
        {
            f>>a>>b>>c;
            if(d[a]+c==d[b])
				block[b]=1;
            if(d[b]+c==d[a])
				block[a]=1;
        }
        bool ok=0;
        for(i=1;i<=n&&!ok;++i)
            if(!block[i])
            {
                ok=1;
                g<<"NU\n";
            }

        if(!ok) g<<"DA\n";
    }
	return 0;
}