#include<cstdio>
using namespace std;
int n,m,S,t,T,i,x,y,cost,dist[50001];
int main()
{
    freopen("distante.in","r",stdin);
    freopen("distante.out","w",stdout);
    scanf("%d",&T);
    for(t=1;t<=T;t++)
    {
       scanf("%d %d %d",&n,&m,&S);
        for(i=1;i<=n;i++)
            scanf("%d",&dist[i]);
        bool ok=true;
        if(dist[S])
            ok=false;
        for(i=1;i<=m;i++)
        {
            scanf("%d %d %d",&x,&y,&cost);
            if(dist[x]+cost<dist[y] || dist[y]+cost<dist[x])
            {
                ok=false;
            }
        }
        if(ok)
            printf("DA\n");
        else
            printf("NU\n");
    }
    return 0;
}