#include<fstream>
using namespace std;
int T,k,ok,D[50001],n,m,s,a,b,c,i;
int main()
{
    freopen("distante.in","r",stdin);
    freopen("distante.out","w",stdout);
    scanf("%d", &T);
    for(k=1;k<=T;++k)
    {
        ok=1;
        scanf("%d %d %d", &n,&m,&s);
        for(i=1;i<=n;++i)
            scanf("%d", &D[i]);
        for(i=1;i<=m;++i)
        {
            scanf("%d %d %d", &a,&b,&c);
            if(D[a]+c<D[b]||D[b]+c<D[a]) ok=0;
        }
        if(D[s]!=0) ok=0;
        if(ok) printf("DA \n");
        else printf("NU \n");
    }
    return 0;
}