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