#include <bits/stdc++.h>
#define DMAX 50005
using namespace std;
int n, m, d[DMAX], D[DMAX], t, s, x, y, c;
int main()
{
    freopen("distante.in", "r", stdin);
    freopen("distante.out", "w", stdout);
    cin>>t;
    for(int g=1; g<=t; g++)
    {
        scanf("%i %i %i", &n, &m, &s);
        for(int i=1; i<=n; i++)
            scanf("%i", &D[i]);
        if(D[s]!=0) {cout<<"NU\n"; continue;}
        int ok=0;
        for(int i=1; i<=m; i++)
        {
            scanf("%i %i %i", &x, &y, &c);
            if(D[x]+ c < D[y] || D[y] + c < D[x])
            {
                cout<<"NU\n";
                ok=1;
                break;
            }
        }
        if(ok==0)
        cout<<"DA\n";
    }

    return 0;
}