#include <bits/stdc++.h>

using namespace std;
ifstream in("distante.in");
ofstream out("distante.out");
int t,n,m,s,x,y,d[50005],k,c;
int main()
{
    in>>t;
    while(t--)
    {
        in>>n>>m>>s;
        for(int i=1;i<=n;i++) in>>d[i];
        k=1;
        if(d[s]!=0) k=0;
        for(int i=1;i<=m;i++)
        {
            in>>x>>y>>c;
            if(d[x]+c<d[y]) k=0;
            if(d[y]+c<d[x]) k=0;
        }
        if(k) out<<"DA"<<'\n';
        else out<<"NU"<<'\n';
    }
    return 0;
}