#include <stdio.h>

using namespace std;

const int N = 50005;

int main()
{
    int n, m, start, T;
    int dist[N];
    bool ok;
    freopen("distante.in", "r", stdin);
    freopen("distante.out", "w", stdout);
    scanf("%d", &T);
    for (; T--;)
    {
        ok = true;
        scanf("%d %d %d", &n, &m, &start);
        for (int i = 1; i <= n; i++)
            scanf("%d", &dist[i]);
        if (dist[start]) ok = false;
        for (int i = 1, a, b, c; i <= m; i++)
        {
            scanf("%d %d %d", &a, &b, &c);
            ok &= dist[a] + c < dist[b] || dist[b] + c < dist[a];
        }
        if (ok) printf("DA\n");
        else printf("NU\n");
    }
    return 0;
}