Go: package main

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

// I/O
type Scanner struct {
	sc *bufio.Scanner
}

func NewScanner() *Scanner {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Buffer(make([]byte, 1024), int(1e+9))
	return &Scanner{sc}
}

func (s *Scanner) nextStr() string {
	s.sc.Scan()
	return s.sc.Text()
}

func (s *Scanner) nextInt() int {
	i, e := strconv.Atoi(s.nextStr())
	if e != nil {
		panic(e)
	}
	return i
}

func (s *Scanner) nextFloat() float64 {
	f, e := strconv.ParseFloat(s.nextStr(), 64)
	if e != nil {
		panic(e)
	}
	return f
}

func (s *Scanner) nextRuneSlice() []rune {
	return []rune(s.nextStr())
}

func (s *Scanner) nextIntSlice(n int) []int {
	res := make([]int, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextInt()
	}
	return res
}

func (s *Scanner) nextFloatSlice(n int) []float64 {
	res := make([]float64, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextFloat()
	}
	return res
}

// Arithmetic
func max(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m < i {
			m = i
		}
	}
	return m
}

func min(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m > i {
			m = i
		}
	}
	return m
}

func abs(x int) int {
	if x > 0 {
		return x
	}
	return -x
}

func pow(x, y int) int {
	res := 1
	for i := 0; i < y; i++ {
		res *= x
	}
	return res
}

func ceil(a, b int) int {
	if a%b == 0 {
		return a / b
	} else {
		return a/b + 1
	}
}

// Sort
type RuneSlice []rune

func (a RuneSlice) Len() int           { return len(a) }
func (a RuneSlice) Less(i, j int) bool { return a[i] < a[j] }
func (a RuneSlice) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

// Main
const INF = 1 << 60

type Edge struct {
	to, cost int
}

type Node struct {
	id, cost int
}

type PQ []Node

func (pq PQ) Len() int           { return len(pq) }
func (pq PQ) Less(i, j int) bool { return pq[i].cost < pq[j].cost }
func (pq PQ) Swap(i, j int)      { pq[i], pq[j] = pq[j], pq[i] }

func (pq *PQ) Push(x interface{}) {
	*pq = append(*pq, x.(Node))
}

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

func main() {
	sc := NewScanner()
	wtr := bufio.NewWriter(os.Stdout)
	N := sc.nextInt()
	E := make([][]Edge, N)
	for i := 0; i < N; i++ {
		id, k := sc.nextInt(), sc.nextInt()
		E[id] = make([]Edge, k)
		for j := 0; j < k; j++ {
			to, cost := sc.nextInt(), sc.nextInt()
			E[id][j] = Edge{to, cost}
		}
	}

	d := make([]int, N)
	for i := 0; i < N; i++ {
		d[i] = INF
	}
	done := make([]bool, N)
	pq := &PQ{}
	heap.Init(pq)
	d[0] = 0
	heap.Push(pq, Node{0, 0})
	for pq.Len() > 0 {
		cur := heap.Pop(pq).(Node).id
		if done[cur] {
			continue
		}
		done[cur] = true
		for i := 0; i < len(E[cur]); i++ {
			to, cost := E[cur][i].to, E[cur][i].cost+d[cur]
			if !done[to] && cost < d[to] {
				d[to] = cost
				heap.Push(pq, Node{to, cost})
			}
		}
	}

	for i := 0; i < N; i++ {
		fmt.Fprintln(wtr, i, d[i])
	}
	wtr.Flush()
}

C++: //By Vlgd
#include<bits/stdc++.h>
using namespace std;
const int N=10000;
const int INF=(1<<21);
struct edge{int w,v;};
struct path{int l,v;};
vector<edge>G[N];
int n,vis[N]={0},dis[N];
//priority_queue<path>pq;
path H[10*N];int h=0;
bool isempty(){return h==0;}
void insert(path p){
	int i=++h;
	H[i]=p;
	while(i>1&&H[i].l<H[i/2].l){
		swap(H[i],H[i/2]);
		i/=2;
	}
}
void heapify(int i){
	int les;
	if(i*2<=h&&H[i].l>H[2*i].l) les=2*i;
	else les=i;
	if(i*2+1<=h&&H[les].l>H[i*2+1].l) les=2*i+1;
	if(les!=i){
		swap(H[i],H[les]);
		heapify(les);
	}
}
path extract(){
	path p=H[1];
	H[1]=H[h--];
	if(h>1) heapify(1);
	return p;
} 
//
void dij(int s){
	for(int i=0;i<n;i++) dis[i]=INF;
	path p;
	dis[s]=0;
	p.l=0;p.v=0;
	insert(p);
	while(!isempty()){
		p=extract();
		int u=p.v;
		vis[u]=1;
		for(int i=0;i<G[u].size();i++){
			int v=G[u][i].v;
			int w=G[u][i].w;
			if(!vis[v]){
				if (dis[v]>dis[u]+w){
					p.l=dis[v]=dis[u]+w;
					p.v=v;
					insert(p);
				}
			}
		}
	}
}
int main(){
	scanf("%d",&n);
	int u,deg;edge e;
	for (int i=0;i<n;i++){
		scanf("%d%d",&u,&deg);
		for(int j=0;j<deg;j++){
			scanf("%d%d",&e.v,&e.w);
			G[u].push_back(e);
		}
	}
	dij(0);
	for (int i=0;i<n;i++) printf("%d %d\n",i,dis[i]);
	return 0;
}

C++: #include<stdio.h>
#define min(a,b) ((a)>(b))?(b):(a)
int main(void){
	int i,j,n,u,k,s,tmp,w,adj[100][100]={0};
	scanf("%d",&n);
	for(i=0;i<n;i++){
		scanf("%d %d",&u,&k);
		for(j=0;j<k;j++){
			scanf("%d %d",&tmp,&w);
			adj[u][tmp]=w;
		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			if((adj[i][j]==0) && (i!=j)){
				adj[i][j]=100000000;
			}
		}
	}
	for(s=0;s<n;s++){
		for(i=0;i<n;i++){
			for(j=0;j<n;j++){
				adj[i][j]=min(adj[i][j],adj[i][s]+adj[s][j]);
			}
		}
	}
	for(i=0;i<n;i++){
		printf("%d %d\n",i,adj[0][i]);
	}
	return 0;
}

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

const int INF = 0xfffffff;
const int MAX = 10000;

struct Edge {
	Edge() {};
	Edge(int v, int c) :v(v), c(c) {};
	bool operator < (const Edge& e)const {
		return c > e.c;
	}
	int v;
	int c;
};

int main() {
	int n;
	priority_queue<Edge> graph[MAX];
	vector<Edge> table;
	bool check[MAX] = { false };
	int ary[MAX] = { 0 };

	cin >> n;

	for (int i = 0; i < n; i++) {
		int u, k;
		cin >> u >> k;
		for (int j = 0; j < k; j++) {
			Edge e;
			cin >> e.v >> e.c;
			graph[u].push(e);
		}
	}

	Edge e(0, 0);
	table.push_back(e);
	check[0] = true;

	for (int i = 1; i < n; i++) {
		Edge minv(0, INF);
		int erase = 0;

		for (int j = 0; j < table.size(); j++) {
			int v = table[j].v;
			int c = table[j].c;	
			while (!graph[v].empty() && check[graph[v].top().v])graph[v].pop();
			if (graph[v].empty())continue;
			if (c + graph[v].top().c < minv.c) {
				minv.c = c + graph[v].top().c;
				minv.v = graph[v].top().v;
				erase = v;
			}
		}
		table.push_back(minv);
		check[minv.v] = true;
		graph[erase].pop();
	}
	
	for (int i = 0; i < n; i++) {
		ary[table[i].v] = table[i].c;
	}
	for (int i = 0; i < n; i++) {
		cout << i << " " << ary[i] << endl;
	}

	return 0;
}

C++: #include<iostream>
#include<queue>
using namespace std;
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;
static const int MAX = 10000;
static const int INFTY = (1 << 21);

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

void dijkstra(int s){
    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[s] = 0;
    PQ.push(make_pair(0, s));
    color[s] = GRAY;

    while( !PQ.empty()){
        pair<int, int> f = PQ.top(); PQ.pop();
        int u = f.second;
        color[u] = BLACK;
/*
        //最小値を取り出し、それが最短でなければ無視
        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;
                //priority_queue　はデフォルトで大きい値を優先するため -1 をかける
                PQ.push(make_pair(d[v] * (-1), v)); //pqは一つ目の値でソートされるため、第一項に距離を持ってきている
                color[v] = GRAY;
            }
        }
    }

    for( int i = 0; i < n; i++){
        cout << i << " " << (d[i] == INFTY ? -1 : d[i]) << endl;
    }
}

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;
            adj[u].push_back(make_pair(v, c));
        }
    }

    dijkstra(0);

    return 0;
}