#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
#define MAX 50010
ifstream fin("drumuri.in");
ofstream fout("drumuri.out");

vector <pair<int, int> > G[MAX];
queue <int > coada;

int viz[MAX], n, m, t, a, s, b, c, i, rez[MAX], j;

bool solve()
{
    while(!coada.empty())
        coada.pop();
    for(i=1;i<=n;i++)
    {
        viz[i]=0;
    }
    viz[s]=0;
    if(viz[s]!=rez[s])
        return 0;
    coada.push(s);
    while(coada.size())
    {
        i=coada.front();
        coada.pop();
        for(j=0;j<G[i].size();j++)
        {
            if(viz[i]+G[i][j].second<rez[G[i][j].first])
            {
                return 0;
            }
            if(viz[i]+G[i][j].second==rez[G[i][j].first])
            {
                viz[G[i][j].first]=viz[i]+G[i][j].second;


                coada.push(G[i][j].first);
            }
        }
    }
    for(i=1;i<=n;i++)
    {
        if(viz[i]!=rez[i])
            return 0;
    }
    return 1;


}

int main()
{
    fin>>t;
    while(t--)
    {
        fin>>n>>m>>s;
        for(i=1;i<=n;i++)
        {
            fin>>rez[i];
        }
        while(m--)
        {
            fin>>a>>b>>c;
            G[a].push_back(make_pair(b, c));
            G[b].push_back(make_pair(a, c));
        }
        if(solve())
        {
            fout<<"DA\n";
        }
        else
            fout<<"NU\n";

    }
}