#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define NMAX 50001

using namespace std;

int n, m, t, start, allGood;
int intrare[NMAX];

int main() {
    freopen("distante.in", "r", stdin);
    freopen("distante.out", "w", stdout);

    int x, y, c;

    scanf("%d", &t);
    while(t--) {
        allGood = 1;
        scanf("%d%d%d", &n, &m, &start);
        for(int i = 1; i <= n; ++i) {
            scanf("%d", &intrare[i]);
        }

        if(intrare[start]) allGood = 0;

        for(int i = 0; i < m; ++i) {
            scanf("%d%d%d", &x, &y, &c);
            if(intrare[x] + c < intrare[y] || intrare[y] + c < intrare[x])
                allGood = 0;
        }

        printf("%s\n", allGood ? "DA" : "NU");
    }

    return 0;
}