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 <utility>
#include <queue>
#define INF 10000000
#define MAX 10000
using namespace std;

// ====== Implement of Heap ======
int heap[2000000]={INF};
int eoh=1;

void minHeapify(int* A, int i){
  int h = eoh-1;
  int l = 2*i;
  int r = 2*i+1;
  int smallest;
  if ( l <= h && A[l] < A[i] )
    smallest = l;
  else
    smallest = i;

  if ( r<= h && A[r] < A[smallest])
    smallest = r;

  if (smallest != i){
    swap(A[i], A[smallest]);
    minHeapify(A, smallest);
  }
}

void insert(int v, int p=-1){
  if (p == -1){
    p = eoh++;
    heap[p] = v;
    insert(v, p);
    return;
  }
  if (p == 1)
    return;
  int parent = heap[p/2];
  if (parent < v)
    return;
  swap(heap[p/2], heap[p]);
  insert(v, p/2);
}

int del(void){
  if (eoh == 1)
    return -1;
  int res = heap[1];
  heap[1] = heap[eoh-1];
  eoh--;
  minHeapify(heap, 1);
  return res;
}
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 

// ====== Implement of List Structure ======
struct Node {
    int to, cost;
    struct Node * next;
};

typedef struct Node * NodePointer;

NodePointer NIL;

NodePointer makeNode(int to, int cost){
    NodePointer newNode = (NodePointer)malloc(sizeof(struct Node));
    newNode->to = to;
    newNode->cost = cost;
    newNode->next = NIL;
    return newNode;
}

NodePointer insert(NodePointer head, int to, int cost){
    NodePointer ite, newNode;
    for (ite=head;ite->next!=NIL;ite=ite->next);
    newNode = makeNode(to, cost);
    ite->next = newNode;
    return newNode;
}


// decl vals
int dist[MAX];

void dijkstraAlgorithm(NodePointer vertex[], int n){
  auto compare = [=](int i, int j){return dist[i] >= dist[j];};
  priority_queue<int, vector<int>,  decltype(compare)> searchQueue {compare}; 

  // Initialize of distance, previous and Push all of vectex to queue 
  dist[0] = 0;
  for (int i=0;i<n;i++){
    if (i!=0) dist[i] = INF;
    searchQueue.push(i);
  }

  while(!searchQueue.empty()){
    int current = searchQueue.top();
    NodePointer ite;
    searchQueue.pop();
    for (ite=vertex[current]->next;ite!=NIL;ite=ite->next){
      int alt = dist[current]+ite->cost;
      if ( dist[ite->to] > alt ){
        dist[ite->to] = alt;
        searchQueue.push(ite->to);
      }
    }
  }
}

int main(){
  NodePointer vertex[MAX];
  int i, n;
  cin >> n;
  NIL = makeNode(0, 0);
  for(i=0;i<n;++i) vertex[i] = makeNode(-1,INF);
  
  for (int i=0;i<n;++i){
    int id, k;
    scanf("%d%d", &id, &k);
    for (int j=0;j<k;++j){
      int node, cost;
      scanf("%d%d", &node, &cost);
      insert(vertex[id], node, cost);
    }
  }

  dijkstraAlgorithm(vertex, n);

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

  return 0;
}

C++: #include <stdio.h>
#include <cmath>
#include <algorithm>
#include <stack>
#include <queue>
#include <vector>
typedef long long int ll;

#define BIG_NUM 2000000000

using namespace std;

struct Node{

	Node(int arg_to,int arg_cost){
		to = arg_to;
		cost = arg_cost;
	}
	bool operator<(const struct Node &arg) const{
			return cost > arg.cost;
	};

	int to,cost;
};

int main(){

	int N;
	scanf("%d",&N);

	vector<Node> V[N];

	int node,num,to,cost,D[N];;

	for(int loop = 0; loop < N; loop++){
		scanf("%d",&node);
		scanf("%d",&num);
		for(int i = 0; i < num; i++){
			scanf("%d %d",&to,&cost);
			V[node].push_back(Node(to,cost));
		}
		D[loop] = BIG_NUM;
	}

	D[0] = 0;

	bool visited[N];
	for(int i = 1; i < N; i++)visited[i] = false;
	visited[0] = true;

	priority_queue<Node> Q;

	for(int i = 0; i < V[0].size(); i++){
		D[V[0][i].to] = V[0][i].cost;
		Q.push(Node(V[0][i].to,V[0][i].cost));
	}

	int min_index;

	while(!Q.empty()){
		if(Q.top().cost == D[Q.top().to]){
			min_index = Q.top().to;
			Q.pop();
		}else{
			Q.pop();
			continue;
		}

		for(int k = 0; k < V[min_index].size(); k++){ //min_index?????????????????´?????§????????¨??´??°??§??????????????§???min_index?????????????????¨?????????????????¢???
			if(D[V[min_index][k].to] > D[min_index] + V[min_index][k].cost){
				D[V[min_index][k].to] = D[min_index] + V[min_index][k].cost;
				Q.push(Node(V[min_index][k].to,D[V[min_index][k].to]));
			}
		}
	}

	for(int i = 0; i < N; i++)printf("%d %d\n",i,D[i]);

    return 0;
}