#include <bits/stdc++.h>

using namespace std;

const int N = 50005;
const int M = 100005;

int n, m, start, T;
int dist[N];
bool ok;

int main()
{
    freopen("distante.in", "r", stdin);
    freopen("distante.out", "w", stdout);
    scanf("%d", &T);
    for (int i5 = 1; i5 <= T; i5++)
    {
        memset(dist, 0 ,sizeof dist);
        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);
            if (dist[a] + c < dist[b] || dist[b] + c < dist[a]) ok = false;
        }
        if (ok) printf("DA");
        else printf("NU");
        printf("\n");
    }
    return 0;
}