Go: package main

import (
	"bufio"
	"container/heap"
	"fmt"
	"os"
	"strconv"
)

const NIL = -1

type Node struct {
	id     int
	weight int
}

func init() {
	sc.Split(bufio.ScanWords)
}

type NodeHeap []Node

func (h NodeHeap) Len() int           { return len(h) }
func (h NodeHeap) Less(i, j int) bool { return h[i].weight < h[j].weight }
func (h NodeHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }

func (h *NodeHeap) Push(x interface{}) {
	*h = append(*h, x.(Node))
}

func (h *NodeHeap) Pop() interface{} {
	old := *h
	n := len(old)
	x := old[n-1]
	*h = old[0 : n-1]
	return x
}

var sc = bufio.NewScanner(os.Stdin)

func scanInt() int {
	num, _ := strconv.Atoi(scanString())
	return num
}

func scanString() string {
	sc.Scan()
	return sc.Text()
}

func init() {
	sc.Split(bufio.ScanWords)
}

func main() {
	n := scanInt()

	route := make([][]Node, n)
	weight := make([]int, n)
	for i := 0; i < n; i++ {
		weight[i] = NIL
	}

	for i := 0; i < n; i++ {
		u := scanInt()
		k := scanInt()
		route[i] = make([]Node, k)
		for j := 0; j < k; j++ {
			route[u][j] = Node{id: scanInt(), weight: scanInt()}
		}
	}

	start := Node{id: 0, weight: 0}
	h := &NodeHeap{start}
	heap.Init(h)

	for h.Len() > 0 {
		node := heap.Pop(h).(Node)
		if weight[node.id] != NIL {
			continue
		}
		weight[node.id] = node.weight

		for _, nextNode := range route[node.id] {
			if weight[nextNode.id] != NIL {
				continue
			}
			nextNode.weight += node.weight
			heap.Push(h, nextNode)
		}
	}

	for i, w := range weight {
		fmt.Println(i, w)
	}
}

C++: #include <iostream>
#include <vector>
#include <queue>
using namespace std;

#define MAX_SIZE 10100
#define INF (1<<30)
#define NOT_VISITED 0
#define VISITED 1
#define COMPLETE 2

int n;
vector<vector<pair<int, int> > > G(MAX_SIZE);

int d[MAX_SIZE], status[MAX_SIZE];

void dijkstra() {
    for (int i = 0; i < n; i++) {
        d[i] = INF;
        status[i] = NOT_VISITED;
    }
    d[0] = 0;

    priority_queue<pair<int, int>, vector<pair<int, int> >, greater<pair<int, int> > > pq;

    pq.push(make_pair(0, 0));
    status[0] = VISITED;

    while (!pq.empty()) {
        pair<int, int> next = pq.top();
        pq.pop();
        int u = next.second;
        status[u] = COMPLETE;
        if (d[u] < next.first) continue;
        for (int i = 0; i < (int)G[u].size(); i++) {
            int v = G[u][i].first;
            if (status[v] == COMPLETE) continue;
            if (d[v] > d[u] + G[u][i].second) {
                d[v] = d[u] + G[u][i].second;
                pq.push(make_pair(d[v], v));
                status[v] = VISITED;
            }
        }
    }
    
    return;
}

void print() {
    for (int i = 0; i < n; i++) {
        cout << i << " ";
        if (d[i] == INF) cout << -1;
        else cout << d[i];
        cout << endl;
    }
    return;
}

int main() {
    cin >> n;
    int u, k, v, c;
    for (int i = 0; i < n; i++) {
        cin >> u >> k;
        for (int j = 0; j < k; j++) {
            cin >> v >> c;
            G[u].push_back(make_pair(v, c));
        }
    }

    dijkstra();

    print();

    return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<queue>
using namespace std;
static const int MAX = 10000;
static const int INFTY = (1<<20);
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;

int n;
vector<pair<int, int> > adj[MAX];

void dijkstra(){
    priority_queue<pair<int, int> > PQ;
    int color[MAX];
    int d[MAX];
    for(int i = 0; i < n; i++){
        d[i] = INFTY;
        color[i] = WHITE;
    }
    
    d[0] = 0;
    PQ.push(make_pair(0, 0));
    color[0] = GRAY;
    
    while(!PQ.empty() ){
        pair<int, int> f = PQ.top();
        PQ.pop();
        int u = f.second;
        color[u] = BLACK;
        
        if(d[u] < f.first * (-1)) continue;
        
        for(int j = 0; j < adj[u].size(); j++){
            int v = adj[u][j].first;
            if(color[v] == BLACK) continue;
            if(d[v] > d[u] + adj[u][j].second){
                d[v] = d[u] + adj[u][j].second;
                PQ.push(make_pair(d[v]* (-1), v));
                color[v] = GRAY;
            }
        }
    }
    
    for(int i = 0; i < n; i++){
        cout << i << " " << (d[i] == INFTY ? -1: d[i]) << endl;
    }
}

int main(){
    int k, u, v, c;
    
    cin >> n;
    for(int i = 0; i < n; i++){
        cin >> u >> k;
        for(int j = 0; j < k; j++){
            cin >> v >> c;
            adj[u].push_back(make_pair(v, c));
        }
    }
    
    dijkstra();
    
    return 0;
}

C++: #include<iostream>
#include<cstdio>
#define INF 1<<30
#define FinishFunction return 0
#define MAX 1000000
using namespace std;
      
struct edge {
  int from,to,cost,k;
};
    
edge es[MAX];
    
int main(){
  int n,u,k,E,c,v;
  E = 0;
  scanf("%d",&n);
    
  for(int i=0;i<n;i++){
    scanf("%d %d",&u,&k);
       
    for(int j=0;j<k;j++){
      scanf("%d %d",&v,&c);
      es[E].from = u;
      es[E].to = v;
      es[E++].cost = c;
    }
  }
    
  // Ika berumanfo-do 
  int d[MAX];
  for(int i=0;i<n;i++)d[i] = INF;
  d[0] = 0;
  while(true){
    bool update = false;
    for(int i=0;i<E;i++){
      edge e = es[i];
      if(d[e.from] != INF && d[e.to] > d[e.from] + e.cost){
    d[e.to] = d[e.from] + e.cost;
    update = true;
      }
    }
    if(!update)break;
  }
  for(int i=0;i<n;i++)cout << i << " " << d[i] << endl;
  FinishFunction;// return 0
}

C++: #include<iostream>
#include<algorithm>
#include<queue>
using namespace std;
#define maxn 10010
#define INFTY (1<<30)
#define WHITE 0
#define GRAY 1
#define BLACK 2

int n;
vector<pair<int,int> > adj[maxn]; //加权有向图的邻接表表示法

void dijkstra(int s)
{
    priority_queue<pair<int,int> > PQ;
    int color[maxn],d[maxn],p[maxn]; //p数组可以不要
    for(int i=0;i<n;i++)
    {
        color[i]=WHITE;
        d[i]=INFTY;
        p[i]=-1;
    }
    d[s]=0;
    PQ.push(make_pair(s,0));
    color[s]=GRAY;

    while(!PQ.empty())
    {
        pair<int,int> f=PQ.top();PQ.pop();
        int u=f.second;
        color[u]=BLACK;

        if(d[u]<f.first*(-1)) continue; //取出最小值，若不是最短路径则忽略

        for(int j=0;j<adj[u].size();j++)
        {
            int v=adj[u][j].first;
            if(color[v]==BLACK) continue;
            if(d[u]+adj[u][j].second<d[v])
            {
                d[v]=d[u]+adj[u][j].second;
                //优先级队列默认优先最大值，所以要乘以-1
                PQ.push(make_pair(d[v]*(-1),v));
                p[v]=u;
                color[v]=GRAY;
            }
        }
    }

    for(int i=0;i<n;i++)
        cout<<i<<" "<<(d[i]==INFTY?-1:d[i])<<endl;
}
int main()
{
    int k,u,v,c;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        cin>>u>>k;
        for(int j=0;j<k;j++)
        {
            cin>>v>>c;
            adj[u].push_back(make_pair(v,c));
        }
    }
    dijkstra(0);
    return 0;
}