#include <stdio.h>
#include <assert.h>
#define N 50005

int a[N];

int main()
{
    freopen("distante.in", "r", stdin);
    freopen("distante.out", "w", stdout);
    int n, m, start, T, ok;
    assert(scanf("%d", &T) == 1);
    while (T--)
    {
        ok = 1;
        assert(scanf("%d %d %d", &n, &m, &start) == 3);
        int i;
        for (i = 1; i <= n; i++)
            assert(scanf("%d", &a[i]) == 1);
        if (a[start]) ok = 0;
        for (i = 1; i <= m; i++)
        {
            int a1, b, c;
            assert(scanf("%d %d %d", &a1, &b, &c) == 3);
            ok &= !(a[a1] + c < a[b] || a[b] + c < a[a1]);
        }
        if (ok) printf("DA\n");
        else printf("NU\n");
    }
    return 0;
}