Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

const (
	white int = iota
	gray
	black
)

type node struct {
	id     int
	parent int
	edge   []int
	weight []int
	color  int
}

type graph struct {
	nodes    []node
	distance []int
}

var infty = 1 << 32
var null = -1

func constructgraph() *graph {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	n := nextInt(sc)

	g := &graph{make([]node, n), make([]int, n)}

	for i := 0; i < n; i++ {
		id := nextInt(sc)
		edges := nextInt(sc)
		n := node{}
		n.id = id
		n.edge = make([]int, edges)
		n.weight = make([]int, edges)
		n.color = white
		for j := 0; j < edges; j++ {
			to := nextInt(sc)
			w := nextInt(sc)
			n.edge[j] = to
			n.weight[j] = w
		}
		g.nodes[id] = n
	}
	return g
}

func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	v, _ := strconv.Atoi(sc.Text())
	return v
}

func (g *graph) preparedijkstra(s int) {
	for i := 0; i < len(g.nodes); i++ {
		g.nodes[i].color = white
		g.nodes[i].parent = null
		g.distance[i] = infty
	}
	g.distance[s] = 0
}

func (g *graph) dijkstra(s int) []int {
	g.preparedijkstra(s)

	for {
		var u int
		mincost := infty
		for i, d := range g.distance {
			if g.nodes[i].color != black && mincost > d {
				mincost = d
				u = i
			}
		}

		if mincost == infty {
			break
		}

		g.nodes[u].color = black

		for i, e := range g.nodes[u].edge {
			if g.nodes[e].color != black {
				if g.distance[e] > g.distance[u]+g.nodes[u].weight[i] {
					g.distance[e] = g.distance[u] + g.nodes[u].weight[i]
					g.nodes[e].parent = u
					g.nodes[e].color = gray
				}
			}
		}
	}
	return g.distance
}

func printShortestPath(d []int) {
	for i, v := range d {
		fmt.Printf("%d %d\n", i, v)
	}
}

func main() {
	g := constructgraph()
	d := g.dijkstra(0)
	printShortestPath(d)
}

C++: #include<bits/stdc++.h>
using namespace std;

typedef pair< int, int > Pi;
struct edge{
  int to, cost;
};
typedef vector< vector< edge > > Graph;

int Dijkstra(Graph& info, int s, int g,
             vector< int >& min_cost) {
  priority_queue< Pi, vector< Pi >, greater< Pi > > que;
  min_cost.resize(info.size(), -1);
  que.push( Pi( 0, s));
  min_cost[s] = 0;
  while(!que.empty()){
    Pi p = que.top(); que.pop();
    if(p.second == g) return p.first;
    if(p.first > min_cost[p.second]) continue;
    for(int i = 0; i < info[p.second].size(); i++){
      edge& e = info[p.second][i];
      if(min_cost[e.to] == -1 ||
         p.first + e.cost < min_cost[e.to]){
        min_cost[e.to] = p.first + e.cost;
        que.push( Pi( min_cost[e.to], e.to));
      }
    }
  }
  return -1;
}
int main(){
  int n;
  cin >> n;
  Graph graph(n);
  vector< int > min_cost;
  for(int i = 0; i < n; i++){
    int u, k;
    cin >> u >> k;
    for(int i = 0; i < k; i++){
      int c, v;
      cin >> v >> c;
      graph[u].push_back( (edge){ v, c});
    }
  }
  Dijkstra( graph, 0, n, min_cost);
  for(int i = 0; i < n; i++){
    cout << i << " " << min_cost[i] << endl;
  }
}

C++: #include <bits/stdc++.h>
using namespace std;

const int INF = numeric_limits<int>::max();

struct edge {
    int u, v, c;
};
struct Graph {
    vector<edge> es;
    vector<int> d;
    Graph(int n) {
        d.assign(n, INF);
    }
};

int main()
{
    int n;
    cin >> n;
    Graph g(n);
    for (int i = 0; i < n; i++) {
        int u, k;
        cin >> u >> k;
        for (int j = 0; j < k; j++) {
            int v, c;
            cin >> v >> c;
            g.es.push_back({u, v, c});
        }
    }

    g.d[0] = 0;
    for (int i = 0; i < n - 1; i++) {
        for (edge e : g.es) {
            if (g.d[e.u] != INF && g.d[e.v] > g.d[e.u] + e.c) {
                g.d[e.v] = g.d[e.u] + e.c;
            }
        }
    }

    for (int i = 0; i < n; i++) {
        cout << i << " " << g.d[i] << endl;
    }
}

C++: #include<bits/stdc++.h>
using namespace std;
#define int long long
int e[111][111],d[111];
int used[111];
signed main(){
  int n;
  cin>>n;
  int INF=1LL<<55LL;
  for(int i=0;i<n;i++)
    for(int j=0;j<n;j++)
      e[i][j]=INF;
  for(int i=0;i<n;i++){
    int u,k;
    cin>>u>>k;
    for(int j=0;j<k;j++){
      int v,c;
      cin>>v>>c;
      e[u][v]=min(e[u][v],c);
    }
  }
  memset(used,0,sizeof(used));
  for(int i=0;i<n;i++) d[i]=INF;
  d[0]=0;
  while(1){
    int u=-1;
    for(int i=0;i<n;i++){
      if(used[i]) continue;
      if(d[i]==INF) continue;
      if(u<0||d[i]<d[u]) u=i;
    }
    if(u<0) break;
    used[u]=1;
    for(int i=0;i<n;i++){
      d[i]=min(d[i],d[u]+e[u][i]);
    }
  }
  for(int i=0;i<n;i++) cout<<i<<" "<<d[i]<<endl;
  return 0;
}

C++: #include<stdio.h>
#include<string.h>
#include<algorithm>
#include<map>
#include<queue>
#include<iostream>
#include <iomanip>
#include<string>
#include<math.h>
using namespace std;
const int inf = 0x3f3f3f3f;
int m, n, i, j, k, a, b, d;
int dis[1010][1010],e[1010], r[1010];
void init()
{
	memset(dis, inf, sizeof(dis));
	for (i = 0; i < 1010; i++)
		dis[i][i] = 0;
}
void add(int a, int b, int c)
{
	dis[a][b] = min(dis[a][b], c);
}
void floyd()
{
	for (k = 0; k < n; k++)
		for (i = 0; i < n; i++)
			for (j = 0; j < n; j++)
				if (dis[i][j] > dis[i][k] + dis[k][j])
					dis[i][j] = dis[i][k] + dis[k][j];
}
int main()
{
	int x, t, u, v;;
	scanf("%d", &n);
	init();
	for (i = 0; i < n; i++)
	{
		scanf("%d %d", &x, &t);
		for (j = 0; j < t; j++)
		{
			scanf("%d %d", &u, &v);
			add(i, u, v);
		}
	}
	floyd();
	for(i=0;i<n;i++)
		printf("%d %d\n",i, dis[0][i]);
	return 0;
}

C++: #include <iostream>
#include <queue>
#include <utility>
#include <vector>
#include <functional>
using namespace std;
int cost[100][100];
const int INF = 10000000;
int dijkstra(int n,int s,int g){
	typedef pair<int,int> P;
	priority_queue<P,vector<P>,greater<P> > pq;
	P p,tp;
	for(int i = 0;i < n;++i){
		p.first = cost[s][i];
		p.second = i;
		if(i == s) p.first = 0;
		pq.push(p);
	}
	while(!pq.empty()){
		p = pq.top();
		pq.pop();
		if(p.second == g) break;
		for(int i = 0;i < n;++i){
			if(cost[p.second][i] != INF){
				tp.first = p.first + cost[p.second][i];
				tp.second = i;
				pq.push(tp);
			}
		}
	}
	return p.first;
}
int main(){
	int n,m,a,b,c;
	cin >> n;
	for(int i = 0;i < 100;++i){
		for(int j = 0;j < 100;++j){
			cost[i][j] = INF;
		}
	}
	for(int i = 0;i < n;++i){
		cin >> a >> m;
		for(int j = 0;j < m;++j){
			cin >> b >> c;
			cost[a][b] = c;
		}
	}
	for(int i = 0;i < n;++i){
		cout << i << " " << dijkstra(n,0,i) << endl;
	}
	return 0;
}