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<iostream>
#include <queue>
using namespace std;

#define INFTY (1 << 30)

//???????????????
enum Color {
	WHITE,
	GRAY,
	BLACK,
};


//SSSP
void Dijkstra(vector<pair<int, int>> v_w_m[], int verNum) {

	//???????¨????
	priority_queue<pair<int, int>> pQ;
	int distance[10000];
	Color color[10000];
	int parent[10000];
	for (int i = 0; i < verNum; i++) {
		color[i] = WHITE;
		distance[i] = INFTY;
		parent[i] = -1;
	}
	distance[0] = 0;
	pQ.push(make_pair(0, 0));


	//SSSP??????
	while (!pQ.empty()) {

		//??°??¬????????????????????????????°?????????????????????¶
//		int min_cost = INFTY;
		int subScript;
		pair<int, int> wei_sub_map = pQ.top();
		pQ.pop();
		subScript = wei_sub_map.second;
		//for (int i = 0; i < verNum; i++) {
		//	if (color[i] != BLACK && distance[i] < min_cost) {
		//		min_cost = distance[i];
		//		subScript = i;
		//	}
		//}

		//?????????????????????
		color[subScript] = BLACK;

		////???????????????????????°??????????????????????????????????????????
		//if (distance[subScript] < wei_sub_map.first * -1)
		//	continue;

		//??£??\?????°??¬??????
		for (int i = 0; i < v_w_m[subScript].size(); i++) {
			int outV = v_w_m[subScript][i].first;
			if (color[outV] == BLACK) continue;
			if (distance[outV] < distance[subScript] + v_w_m[subScript][i].second) continue;

			distance[outV] = distance[subScript] + v_w_m[subScript][i].second;
			parent[outV] = subScript;
			color[outV] = GRAY;
			pQ.push(make_pair(distance[outV] * -1, outV));
		}
	}

	//??????
	int weight_sum = 0;
	for (int i = 0; i < verNum; i++) {
		cout << i << " " << distance[i] << endl;
	}
}


int main() {

	int verNum;
//	int verValWeight[100][100];
	vector<pair<int, int>> v_w_m[10000];
	int parent[100];

	//???????¨????
//	v_w_m = new vector<pair<int, int>>();
	cin >> verNum;
	//for (int i = 0; i < verNum; i++)
	//	for (int j = 0; j < verNum; j++)
	//		verValWeight[i][j] = INFTY;

	//??\?????????
	for (int i = 0; i < verNum; i++) {
		int verVal, outNum;
		cin >> verVal >> outNum;
		for (int j = 0; j < outNum; j++) {
			int outVerVal, weight;
			cin >> outVerVal >> weight;
//			v_w_m[verVal].push_back(make_pair(outVerVal, weight));
			v_w_m[verVal].push_back(make_pair(outVerVal, weight));
			//			verValWeight[i][outVerVal] = weight;
		}
	}

	//SSSP
	Dijkstra(v_w_m, verNum);

	return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<string>
#include<algorithm>
#include<cstring>
#include<vector>
using namespace std;
#define int(x) int x; scanf("%d",&x)
#define input(x) scanf("%d",&x)
#define rep(x,n) for(int x = 0; x < n; x++)
#define _br printf("\n")
#define INF 2000000000

vector<pair<int,int> > PathList[100];
int d[100];
bool complete[100];

void dijkstra(int n,vector<pair<int,int> > PathList[]){
    rep(i,n){
        d[i] = INF;
        complete[i] = false;
    }
    d[0] = 0;
    
    int count = 0;
    
    while (count != n) {
        int mind = INF;
        int mindi = 0;
        
        //select
        rep(i,n){
            if (!complete[i] && d[i] < mind) {
                mind = d[i];
                mindi = i;
            }
        }
        
        complete[mindi] = true;
        count++;
        
        //update
        rep(i,PathList[mindi].size()){
            if (PathList[mindi][i].second + d[mindi] < d[PathList[mindi][i].first]) {
                d[PathList[mindi][i].first] = PathList[mindi][i].second + d[mindi];
            }
        }
    }
}


int main(){
    int(n);
    rep(i,n){
        int(k);int(num);
        rep(j,num){
            int(s);int(t);
            PathList[i].push_back(make_pair(s,t));
        }
    }
    
    dijkstra(n,PathList);
    
    rep(i,n){
        printf("%d %d\n",i,d[i]);
    }
    
    return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<queue>
using namespace std;
static const int MAX=10000;
static const int INFTY=(1<<20);
static const int W=0;
static const int G=1;
static const int B=2;

int n;
vector<pair<int ,int> > adj[MAX];

void dij(){
  priority_queue<pair<int ,int> > PQ;
  int color[MAX];
  int d[MAX];
  int i;

  for(i=0;i<n;i++){
    d[i]=INFTY;
    color[i]=W;
  }
  
  d[0]=0;
  PQ.push(make_pair(0,0));
  color[0]=G;

  while(!PQ.empty()){
    pair<int,int> f=PQ.top();
    PQ.pop();
    int u;
    u=f.second;
    color[u]=B;

    if(d[u]<f.first*(-1)) continue;

    int j;

    for(j=0;j<adj[u].size();j++){
      int v=adj[u][j].first;
      if(color[v]==B) 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]=G;
      }
    }
  }
  for(i=0;i<n;i++){
    cout<<i<<" "<<(d[i]==INFTY ? -1:d[i])<<endl;
  }
}

int main(){
  int k,u,v,c,i,j;

  cin>>n;
  for(i=0;i<n;i++){
    cin>>u>>k;
    for(j=0;j<k;j++){
      cin>>v>>c;
      adj[u].push_back(make_pair(v,c));
    }
  }
  dij();
  return 0;
}