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++: #include <iostream>
#include <vector>
#include <queue>

using namespace std;

struct Edge{
    int v, c;

    Edge(int v, int c):v(v), c(c){}

//    bool operator >(Edge &e){
//        return c > e.c;
//    }
};

struct SDto{
    int v, d, from;
    SDto(int v, int d, int from): v(v), d(d), from(from){}

//    bool operator <(SDto &that){
//        return d < that.d;
//    }

    friend bool operator>(SDto s1, SDto s2){
        return s1.d > s2.d;
    }

//    friend bool operator<(SDto s1, SDto s2){
//        return s1.d < s2.d;
//    }
};

// dijkstra
const int MAX_N = 10000, INF = 1 << 28;
int distTo[MAX_N];
int parentOf[MAX_N];
void dijkstra(vector<Edge> G[]);

int main() {
//    SDto s1(1, 1, 1);
//    SDto s2(1, 2, 1);
//    cout << (s1 > s2);

    int n;
    cin >> n;

    // Graph
    vector<Edge> 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[u].emplace_back(v, c);
        }
    }

    dijkstra(G);

    for (int l = 0; l < n; ++l) {
        cout << l << " " << distTo[l] << endl;
    }

    return 0;
}

void dijkstra(vector<Edge> G[]){
    fill(distTo, distTo + sizeof(distTo) / sizeof(*distTo), INF);

    priority_queue<SDto, vector<SDto>, greater<SDto>> pq;

    pq.push(SDto(0, 0, -1));
    while(!pq.empty()) {
        SDto sd = pq.top(); pq.pop();
        if (sd.d < distTo[sd.v]) {
            distTo[sd.v] = sd.d;
            for (auto e: G[sd.v]) {
                if (distTo[e.v] < INF) continue;
                pq.push(SDto(e.v, distTo[sd.v] + e.c, sd.v));
            }
        }
    }
}

C++: #include<cstdio>
#include<queue>
#include<algorithm>
#include<vector>
#include<map>
using namespace std;
const int MAX= 100005 ;
const int INF= 1<<30 ;
int n,d[MAX],vis[MAX];
vector<pair<int,int> > G[MAX];
void init(){
	for(int i=0;i<n;i++){
		d[i]=INF;
		vis[i]=0;
	}
	d[0]=0;
}
void dijkstra(){
	priority_queue<pair<int,int> > PQ;
	PQ.push(make_pair(0,0));
	while(!PQ.empty()){
		pair<int,int> f=PQ.top();PQ.pop();
		int u=f.second;
		vis[u]=1;
		if(d[u]>=-f.first){
			for(int i=0;i<G[u].size();i++){
				int v=G[u][i].first;
				if(!vis[v] && d[v]>G[u][i].second+d[u]){
					d[v]=G[u][i].second+d[u];
					PQ.push(make_pair(-d[v],v));
				}
			}
		}
	}
}
int main(){
	int u,k,v,c;
	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);
			G[u].push_back(make_pair(v,c));
		}
	}
	init();
	dijkstra();
	for(int i=0;i<n;i++){
		printf("%d %d\n",i,d[i]);
	}
	return 0;
}

C++: #include <bits/stdc++.h>
#define REP(i,n) for (int i = 0; i <(n); ++i)
#define ALL(v) v.begin(), v.end()
using namespace std;
using ll = long long;
using P = pair<int,int>;

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];
//グラフの隣接リスト表現(重み付き有向)　first:隣接頂点，second; コスト

void dijkstra(){
  priority_queue<pair<int, int>> PQ;  //各隣接頂点の始点からのコストのキュー
  int color[MAX]; //訪問状況
  int d[MAX];     //始点から各頂点までの最小コスト
  //初期化
  for(int i = 0; i < n; ++i){
    d[i] = INFTY;
    color[i]  = WHITE;
  }

  //始点のコストｄ[0]と，，priority_quwueに代入
  d[0] = 0;
  PQ.push(make_pair(0, 0));
  color[0] = GRAY;


  //最短経路の探索ループ

  while( !PQ.empty() ){
     //最小コストの頂点を取得し，確定
    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; //確定した頂点は飛ばす

      //最小コストを比較して，　更新
      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));
        //priority_queueは大きい値を優先するため，−１をかける．
        color[v] = GRAY;
      }
    }
  }

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


}

int main(){
  //Input
  int k, u, v, c; //頂点uに隣接する頂点の数， 頂点, 頂点ｋに隣接する頂点, u>vのコスト
  cin >> n;

  REP(i,n){
    cin >> u >> k;
    REP(j,k){
      cin >> v >> c;
      adj[u].push_back(make_pair(v, c));
    }
  }

  //
  dijkstra();

  return 0;
}