#include<iostream>
#include<cstdio>
#include<set>
#include<vector>
using namespace std;
set<pair<int,int> > s;
vector<pair<int,int> >v[50001];
int n,m,dist[50001];
void citire()
{
    int x,y,z;
    cin>>x>>y>>z;
    v[x].push_back(make_pair(y,z));
}
void dijkstra()
{

}
int main()
{
    freopen("dijkstra.in","r",stdin);
    freopen("dijkstra.out","w",stdout);
    int i;
    cin>>n>>m;
    for(i=1; i<=m; i++) citire();

    return 0;
}