#include <iostream>
#include <vector>
#include <map>
#include <unordered_map>
#include <queue>
using namespace std;
const int maxn = 1e5 + 10;
int n;
vector<pair<int, int>> graph[maxn];
struct node {
    int idx, cost;
    node () {}
    node(int _idx, int _cost) {
        idx = _idx;
        cost = _cost;
    }
    
    bool operator < (const node & tmp) const {
        return cost > tmp.cost;
    }
    
};

void dijkstra(int S) {
    vector<bool> visited(n, false);
    vector<int> dist(n, 2e9);
    
    dist[S] = 0;
    priority_queue<node> pq;
    pq.push(node(S, 0));
    
    while(!pq.empty()) {
        node c = pq.top();
        pq.pop();
        
        if(visited[c.idx]) continue;
        visited[c.idx] = true;
        
        for(int i = 0; i < (int) graph[c.idx].size(); i++) {
            int neighbour = graph[c.idx][i].first;
            int weight = graph[c.idx][i].second;
            
            if(!visited[neighbour] and c.cost + weight < dist[neighbour]) {
                dist[neighbour] = c.cost + weight;
                pq.push(node(neighbour, c.cost + weight));
            }
        }
    }
    for(int i = 0; i < n; i++) {
        cout << i << ": " << dist[i] << endl;
    }
    
}
int main()
{
    int  m;
    cin >> n >> m;
    
    for(int i = 0; i < m; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        graph[a].push_back(make_pair(b, c));
        graph[b].push_back(make_pair(a, c));
    }
    dijkstra(0);
    
  
    return 0;

}