#include <stdio.h>
#include <vector>

#define NMAX 50001

using namespace std;

int n, m, t, start, allGood;
int intrare[NMAX], iesire[NMAX];
vector< pair<int, int> > graf[NMAX];

void solve() {
    for(int i = 1; i <= n; ++i) {
       for(int j = 0; j < graf[i].size(); ++j){
            if(graf[i][j].second + intrare[i] == intrare[graf[i][j].first])
                iesire[graf[i][j].first] = 1;
        }
    }
}

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

    int x, y, c;

    scanf("%d", &t);
    while(t--) {
        for(int i = 1; i <= n; ++i) {
            graf[i].clear();
            iesire[i] = 0;
        }

        scanf("%d%d%d", &n, &m, &start);
        for(int i = 1; i <= n; ++i) {
            scanf("%d", &intrare[i]);
        }
        for(int i = 0; i < m; ++i) {
            scanf("%d%d%d", &x, &y, &c);
            graf[x].push_back(make_pair(y, c));
            graf[y].push_back(make_pair(x, c));
        }

        iesire[start] = 1;
        solve();
        allGood = 1;
        for(int i = 1; i <= n; ++i) {
            if(!iesire[i]) {
                allGood = 0;
                break;
            }
        }

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

    return 0;
}