Go: package main

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

//make priority queue
type Item struct {
	id       int
	priority int // this state is priority and distans from start
	index    int
}

type PriorityQueue []*Item

func (pq PriorityQueue) Len() int { return len(pq) }

// we want the ascending-priority-queue.
// So we use less than here.
func (pq PriorityQueue) Less(i, j int) bool {
	return pq[i].priority < pq[j].priority
}

func (pq PriorityQueue) Swap(i, j int) {
	pq[i], pq[j] = pq[j], pq[i]
	pq[i].index = j
	pq[j].index = i
}

func (pq *PriorityQueue) Push(x interface{}) {
	n := len(*pq)
	item := x.(*Item)
	item.index = n
	*pq = append(*pq, item)
}

func (pq *PriorityQueue) Pop() interface{} {
	old := *pq
	n := len(old)
	item := old[n-1]
	item.index = -1 //for safety
	*pq = old[0 : n-1]
	return item
}

func (pq *PriorityQueue) update(dist int, id int) {
	for _, i := range *pq {
		if i.id == id {
			if i.priority > dist {
				i.priority = dist
			}
		}
	}
}

// the main code
func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	n, _ := strconv.Atoi(sc.Text())
	return n
}

func dikstra(dist *[][]int, n int) *[]int {
	// preparate priority queue
	inf := 1 << 30
	pq := make(PriorityQueue, n)
	shortests := make([]int, n)
	for i := 0; i < n; i++ {
		pq[i] = &Item{
			id:       i,
			priority: inf,
			index:    i,
		}

		shortests[i] = inf
	}
	pq[0].priority = 0
	shortests[0] = 0
	heap.Init(&pq)

	for pq.Len() > 0 {
		item := heap.Pop(&pq).(*Item)
		shortests[item.id] = item.priority
		for id, d := range (*dist)[item.id] {
			if d != -1 {
				pq.update(item.priority+d, id)
			}
		}
		heap.Init(&pq)
	}
	return &shortests
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	// init
	n := nextInt(sc)
	dist := make([][]int, n)
	for i := 0; i < n; i++ {
		dist[i] = make([]int, n)
		for j := 0; j < n; j++ {
			dist[i][j] = -1
		}
	}

	// std Input
	for i := 0; i < n; i++ {
		u := nextInt(sc)
		k := nextInt(sc)
		for j := 0; j < k; j++ {
			v, c := nextInt(sc), nextInt(sc)
			dist[u][v] = c
		}
	}

	shortests := dikstra(&dist, n)
	for i, d := range *shortests {
		fmt.Printf("%d %d\n", i, d)
	}
}

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);

	int** distance = new int*[N];

	for(int i = 0; i < N; i++){
		distance[i] = new int[N];
		for(int k = 0; k < N; k++)distance[i][k] = BIG_NUM;
	}

	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);
			distance[node][to] = cost;
			distance[to][node] = cost;
		}
		D[loop] = BIG_NUM;
	}

	D[0] = 0;
	distance[0][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 = 1; i < N; i++){
		if(distance[0][i] != BIG_NUM){
			D[i] = distance[0][i];
			Q.push(Node(i,distance[0][i]));
		}
	}

	int min_index;

	while(!Q.empty()){
		if(visited[Q.top().to] == false){ //Q???BIG_NUM????????£?????????????????¨??????????????§???BIG_NUM??¨??????????????????
			min_index = Q.top().to;
			Q.pop();
		}else{
			Q.pop();
			continue;
		}

		visited[min_index] = true;

		for(int i = 1; i < N; i++){
			if(distance[min_index][i] != BIG_NUM && D[i] > D[min_index]+distance[min_index][i]){
				D[i] = D[min_index]+distance[min_index][i];
				Q.push(Node(i,D[i]));
			}
		}
	}

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

    return 0;
}

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

int INF=1000000001;

typedef struct edge{
  int to;
  int cost;
}edge;

int N,E;
vector< edge > G[100000];
long long mincost[100000];

void dijkstra(){
  typedef pair<int,int> P;
  priority_queue<P,vector<P>,greater<P> > Q;
  for(int i=0;i<N;i++){
    mincost[i]=INF;
  }
  mincost[0]=0;
  Q.push(P(0,0));
  while(!Q.empty()){
    int pos=Q.top().second;
    int pos_cost=Q.top().first;
    Q.pop();
    if( mincost[pos] < pos_cost )continue;
    
    for(int i=0;i<(int)G[pos].size();i++){
      edge e=G[pos][i];
      if(mincost[e.to]>pos_cost+e.cost){
	mincost[e.to]=pos_cost+e.cost;
	Q.push(P(mincost[e.to],e.to));
      }
    }
  }
  for(int i=0;i<N;i++){
    cout<<i<<" "<<mincost[i]<<endl;
  }
}

int main(){
  cin>>N;
  for(int i=0;i<N;i++){
    int id,k;
    cin>>id>>k;
    for(int j=0;j<k;j++){
      edge e;
      cin>>e.to>>e.cost;
      G[id].push_back(e);
    }
  }

  dijkstra();
  
  return 0;
}

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

using namespace std;

#define GRAPH_SIZE 10000
#define WEIGHT_MAX UINT32_MAX

enum state_t { WHITE, GRAY, BLACK };

static state_t state[GRAPH_SIZE];
static priority_queue<pair<uint32_t, uint32_t>, vector<pair<uint32_t, uint32_t>>, greater<pair<uint32_t, uint32_t>>> min_queue;
static vector<pair<uint32_t, uint32_t>> graph[GRAPH_SIZE];
static uint64_t dist[GRAPH_SIZE];

void single_source_shortest_path(size_t num)
{
  for (uint32_t i = 0; i < num; i++) {
    dist[i] = WEIGHT_MAX;
    state[i] = WHITE;
  }

  state[0] = GRAY;
  dist[0] = 0;
  min_queue.push(make_pair(dist[0], 0));

  while (!min_queue.empty()) {
    pair<uint32_t, uint32_t> min = min_queue.top();
    min_queue.pop();
    uint32_t min_index = min.second;
    if (state[min_index] != BLACK) {
      state[min_index] = BLACK;
      for (uint32_t i = 0; i < graph[min_index].size(); i++) {
        pair<uint32_t, uint32_t> to = graph[min_index][i];
        uint32_t to_index = to.first;
        uint32_t to_weight = to.second;
        if (((dist[min_index] + to_weight) < dist[to_index]) && (state[to_index] != BLACK)) {
          dist[to_index] = dist[min_index] + to_weight;
          min_queue.push(make_pair(dist[to_index], to_index));
          state[to_index] = GRAY;
        }
      }
    }
  }
}

int32_t main()
{
  uint32_t num;
  cin >> num;

  for (uint32_t i = 0; i < num; i++) {
    uint32_t index, len;
    cin >> index >> len;
    for (uint32_t j = 0; j < len; j++) {
      uint32_t connect, weight;
      cin >> connect >> weight;
      graph[index].push_back(make_pair(connect, weight));
    }
  }

  single_source_shortest_path(num);

  for (uint32_t i = 0; i < num; i++) {
    cout << i << " " << dist[i] << endl;
  }

  return 0;
}