#include <stdio.h>

#define BUF_SIZE 16384
char buf[BUF_SIZE];
int pbuf=BUF_SIZE;
FILE*fi,*fo;
inline char nextch(){
    if(pbuf==BUF_SIZE){
        fread(buf, BUF_SIZE, 1, fi);
        pbuf=0;
    }
    return buf[pbuf++];
}
inline long long nextnum(){
    long long a=0;
    char c=nextch();
    while((c<'0' || c>'9') && c!='-')
        c=nextch();
    int semn=1;
    if(c=='-'){
        semn=-1;
        c=nextch();
    }
    while('0'<=c && c<='9'){
        a=a*10+c-'0';
        c=nextch();
    }
    return a*semn;
}

#define MAXN 50000

int dmin[1+MAXN];
int main(){
    fi=fopen("distante.in","r");
    fo=fopen("distante.out","w");
    int t=nextnum();
    for(int z=0;z<t;z++){
        int binibiniditat=1;
        int n=nextnum(), m=nextnum(), s=nextnum();
        for(int i=1;i<=n;i++)
            dmin[i]=nextnum();
        if(dmin[s]!=0)
            binibiniditat=0;

        for(int i=1;i<=m;i++){
            int a=nextnum(), b=nextnum(), c=nextnum();
            if(dmin[a]+c<dmin[b] || dmin[b]+c<dmin[a])
                binibiniditat=0;
        }

        if(binibiniditat==1)
            fprintf(fo,"DA\n");
        else
            fprintf(fo,"NU\n");
    }
    fclose(fi);
    fclose(fo);
    return 0;
}