#include<stdio.h>

const int inf=1000000;
struct nod { int x,y,c;
           } a[200001];
int n,m,t,s,d[50001];

void citire()
{    int i;
     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[i].x,&a[i].y,&a[i].c);
}

int verif()
{   int i;
    if(d[s]!=0) return 0;
    for(i=1;i<=m;i++) if(d[a[i].x]+a[i].c<d[a[i].y]) return 0;
    return 1;
}

int main()
{   int i;
    freopen("distante.in","r",stdin);
    freopen("distante.out","w",stdout);
    scanf("%d",&t);
    for(i=1;i<=t;i++)
    {   citire();
        if(verif()) printf("DA\n");
          else printf("NU\n");
    }
    fclose(stdin);
    fclose(stdout);
    return 0;
}