#include <cstdio>

#define FIN "distante.in"
#define FOUT "distante.out"
#define MAXN 50001

int t, ok, i;
long n, m, s, a[MAXN], x, y, c, j;

int main () {
	freopen(FIN, "r", stdin);
  freopen(FOUT, "w", stdout);
  scanf("%d", &t);
  for (i=1; i<=t; i++) {
     ok = 1;
     scanf("%ld %ld %ld", &n, &m, &s);
     for (j=1; j<=n; j++) scanf("%ld", &a[j]);
     for (j=1; j<=m; j++) {
        scanf("%ld %ld %ld", &x, &y, &c);
        if (a[x] + c < a[y] || a[y] + c < a[x]) ok = 0;
     }
  	 if (ok) printf("DA\n"); else printf("NU\n");
  }
	return 0;
}