#include <cstdio>
#include <bitset>
using namespace std;

const int inf=2<<30;
int n,m,h[400000],d[200000];
bitset<200000> nina;

struct NA
{
    int x,c;
    NA* u;
}*nod[200000];

void read()
{
    freopen("apm.in","r",stdin);
    int i,x,c;
    NA *p;
    scanf("%d%d",&n,&m);
    for(i=0;i<m;++i)
    {
        scanf("%d",&x);
        p=new NA;
        p->u=nod[x];
        nod[x]=p;
        scanf("%d",&x);
        p->x=x;
        scanf("%d",&x);
        p->c=x;
    }
}

int main()
{

    return 0;
}