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++: //
//  main.cpp
//  单元最短路径
//
//  Created by 陆昱珉 on 2018/12/26.
//  Copyright © 2018 Lu. All rights reserved.
//

//dijkstra algorithm

#include <stdio.h>
#define INF 999999

int n, k;
int color[10010], d[10010];
int map[10010][10010];

int dijkstra(int s)
{
    for(int i = 0; i < n; i ++)
    {
        d[i] = INF;
    }
    d[s] = 0;
    while(1)
    {
        int min = INF;
        int u = -1;
        for(int i = 0; i < n; i ++)
        {
            if(min > d[i] && color[i] != 1)
            {
                u = i;
                min = d[i];
            }
        }
        if(u == -1)
            break;
        color[u] = 1;//染色，以防后面重复使用
        for(int i = 0; i < n; i ++)
        {
            if(color[i] != 1 && map[u][i] != INF)
                if(d[i] > d[u] + map[u][i])
                    d[i] = d[u] + map[u][i];
        }
    }
    return 0;
}

int main(void)
{
    int x, y, v;
    scanf("%d", &n);
    for(int i = 0; i < n; i ++)
        for(int j = 0; j < n; j ++)
            map[i][j] = INF;
    for(int i = 0; i < n; i ++)
    {
        scanf("%d%d", &x, &k);
        for(int j = 0; j < k; j ++)
        {
            scanf("%d%d", &y, &v);
            map[x][y] = v;
        }
    }
    dijkstra(0);
    
    for(int i = 0; i < n; i ++)
    {
        if(d[i] != INF)
            printf("%d %d", i, d[i]);
        printf("\n");
    }
    return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<queue>
using namespace std;
static const int MAX=100;
static const int INFTY=2000000000;
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 d[MAX],color[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])<<"\n";
}
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<stdio.h>
#include<algorithm>
#include<queue>

using namespace std;

// 0-origin
#define MAX 10000
#define INF 500001
#define WHITE 0
#define GRAY 1
#define BLACK 2

int n;
int M[MAX][MAX]; // 隣接行列
vector< pair<int, int> > adj[MAX]; // 重み付き有向グラフの隣接リスト

// O(|V|^2)
void dijkstra(int start){
    int i, u, v;
    int d[MAX]; // 最短経路のコスト
    int p[MAX]; // 最短経路木における親
    int color[MAX]; // S : GRAY  uに隣接かu自身 : BLACK  S-V : WHITE
    
    //init
    for (i = 0; i < n; i++) {
        d[i] = INF;
        color[i] = WHITE;
    }
    d[start] = 0;
    p[start] = -1;
    
    int mincost;
    while (1) {
        mincost = INF;
        for (i = 0; i < n; i++) {
            if (color[i] != BLACK && d[i] < mincost) {
                mincost = d[i];
                u = i;
            }
        }
        
        if (mincost == INF) {
            break;
        }
        
        color[u] = BLACK;
        /*printf("u:%d\n",u);
        for (i = 0; i < n; i++) {
            printf("%d:%s\n", i, color[i] == 1 ? "WHITE" : color[i] == 0 ? "GRAY" : "BLACK");
        }
         printf("\n");*/
        
        // BLACKのノードから隣接してるノードの最短距離を更新しGRAYにする
        for (v = 0; v < n; v++) {
            if (color[v] != BLACK && M[u][v] != INF) {
                if (d[u] + M[u][v] < d[v]) {
                    d[v] = d[u] + M[u][v];
                    p[v] = u;
                    color[v] = GRAY;
                }
            }
        }
        /*for (i = 0; i < n; i++) {
            printf("%d:%s\n", i, color[i] == WHITE ? "WHITE" : color[i] == GRAY ? "GRAY" : "BLACK");
        }*/
    }
    
    for (i = 0; i < n; i++) {
        printf("%d %d\n", i, d[i]);
    }
}



// O((|V|+|E|)log|V|)
void dijkstra2(int start){
    priority_queue< pair<int, int> > PQ; // pair.firstの値が大きい順に先頭から並ぶ？ first->d, second->ノード番号
    int i,j;
    int color[MAX];
    int d[MAX]; // 最短経路のコスト
    
    // init
    for (i = 0; i < n; i++) {
        d[i] = INF;
        color[i] = WHITE;
    }
    d[start] = 0;
    PQ.push(make_pair(d[start], start));
    color[start] = GRAY;
    
    pair<int, int> f;
    int u;
    while (!PQ.empty()) {
        f = PQ.top();
        PQ.pop();
        u = f.second;
        color[u] = BLACK;
        
        if ( d[u] < f.first*(-1) ) {
            continue;
        }
        
        for (j = 0; j < adj[u].size(); j++) {
            int v = adj[u][j].first; // uとつながっているノードの番号
            if (color[v] == BLACK) {
                continue;
            }
            if (d[u] + adj[u][j].second < d[v]) {
                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++) {
        printf("%d %d\n", i, d[i]);
    }
    
}



int main(){
    int i,j,m,l,k;
    
    scanf("%d", &n);
#ifdef d1
    // MをすべてINFに初期化
    for (i = 0; i < n; i++) {
        for (j = 0; j < n; j++) {
            M[i][j] = INF;
        }
    }
    
    // read
    for (i = 0; i < n; i++) {
        scanf("%d %d", &m, &m);
        for (j = 0; j < m; j++) {
            scanf("%d", &l);
            scanf("%d", &M[i][l]);
        }
    }
    /*
    for (i = 0; i < n; i++) {
        for (j = 0; j < n; j++) {
            printf("%d ", M[i][j]);
        }
        printf("\n");
    }*/
    
    dijkstra1(0);
#else
    for (i = 0; i < n; i++) {
        scanf("%d %d", &m, &m);
        for (j = 0; j < m; j++) {
            scanf("%d %d", &l, &k);
            adj[i].push_back(make_pair(l, k));
        }
    }
    
    dijkstra2(0);
#endif
    
    return 0;
}