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<cstdio>
#include<cstring>
#include<queue>
using namespace std;
const int maxn=1000000;
const int infly=(1<<21);
const int white=0;
const int grey=1;
const int black=-1;

struct node{
    int k;
    int to;
    int next;
};

struct node m[2*maxn+5];
int head[maxn+5],n=0;
int color[maxn+5],d[maxn+5],p[maxn+5];
int tu,k,v,c,nn;
int cnt=0;

void add(int u,int v,int tot)
{
    m[++n].k=v;
    m[n].next=head[u];
    m[n].to=tot;
    head[u]=n;
}

void ds()
{
    priority_queue<pair<int, int> > p;
    for(int i=0;i<=maxn;i++)
    {
        color[i]=white;
        d[i]=infly;
    }

    d[0]=0;
    p.push(make_pair(0,0));
    color[0]=grey;

    while(!p.empty())
    {
        pair<int,int> f=p.top();
        p.pop();
        int u=f.second;

        color[u]=black;

        for(int j=head[u];j;j=m[j].next)
        {
            int v=m[j].k;
            if(color[v]==black) continue;
            if(d[v]>d[u]+m[j].to)
            {
                d[v]=d[u]+m[j].to;
                p.push(make_pair(d[v]*(-1),v));
                color[v]=grey;
            }
        }
    }
}

int main()
{
    scanf("%d",&nn);
    for(int i=1;i<=nn;i++)
    {
        scanf("%d%d",&tu,&k);
        for(int j=1;j<=k;j++)
        {
            scanf("%d%d",&v,&c);
            add(tu,v,c);
        }
    }


    ds();
    for(int i=0;i<nn;i++)
    {
        printf("%d ",i);
        if(d[i]!=infly) printf("%d\n",d[i]);
        else printf("-1\n");
    }

    return 0;
}

C++: #include<iostream>
#include<climits>
using namespace std;

typedef struct{
  int A[10010];
  long long ans;
}node;
node T[10010];
int Q[100300003];
int head=0;
int tail=1;
int n;

void function(int num){
  while(true){
    if(head==tail)break;
    num=Q[head++];
        if(head==100300002)head=1;
    for(int i=0;i<n;i++){
      if(T[num].A[i]!=-1){
	if(T[i].ans>T[num].ans+T[num].A[i]){
	  T[i].ans=T[num].ans+T[num].A[i];
	  Q[tail++]=i;
	  	  if(tail==100300002)tail=1;
	}
      }
    }
  }
}

int main(){
  int num,son,z,w;
  cin>>n;
  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
      T[i].A[j]=-1;
    }
  }


  for(int i=0;i<n;i++){
    cin>>num>>son;
    T[num].ans=LONG_LONG_MAX;
    for(int j=0;j<son;j++){
      cin>>z>>w;
      T[num].A[z]=w;
      }
  }
  Q[0]=0;
  T[0].ans=0;
  function(0);
 
  for(int i=0;i<n;i++){
      cout<<i<<" "<<T[i].ans<<endl;
  }
  return 0;
}

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

void solve(){
  int n; cin >> n;
  vector<vector<pair<int, int> > > v(n);
  for(int i = 0; i < n; i++){
    int u, k; cin >> u >> k;
    for(int j = 0; j < k; j++){
      int a, b; cin >> a >> b;
      v[u].push_back(make_pair(a, b));
    }
  }
  int d[n];
  bool c[n];
  for(int i = 0; i < n; i++){
    c[i] = 0;
    d[i] = 10000000;
  }
  priority_queue<pair<int, int > > pq;
  pq.push(make_pair(0, 0));
  d[0] = 0;
  while(pq.empty() == false){
    int x = pq.top().second;
    pq.pop();
    c[x] = 1;
    for(int i = 0; i < v[x].size(); i++){
      int y = v[x][i].first;
      if(c[y] == 0){
        if(d[y] > d[x] + v[x][i].second){
          d[y] = d[x] + v[x][i].second;
          pq.push(make_pair(d[y] * (-1), y));
        }
      }
    }
  }
  for(int i = 0; i < n; i++){
    cout << i << " " << d[i] << endl;
  }
  return;
}

int main(){
  solve();
  return 0;
}

C++: #include<stdio.h>
int v[10001][10001];
int a[10001][10001];
int d[10001];
int pi[10001];
char color[10001];
int n,mincost;
int k[10001];

void dijkstra(void);

int main(){
  int i,j,u;

  scanf("%d",&n);
  for(i=0;i<n;i++){
    for(j=0;j<n;j++){
      a[i][j]=0;
    }
  }

  for(i=0;i<n;i++){
    scanf("%d %d" ,&u,&k[i]);      
  for(j=1;j<=k[i];j++){
     scanf("%d",&v[u][j]);
     scanf("%d",&a[u][v[u][j]]);   
    }
  }
  dijkstra();

  for(i=0;i<n;i++){
    printf("%d %d\n",i,d[i]);
  }

  return 0;
}

void dijkstra(void){
  int i,j,u,min;
  
  for(i=0;i<n;i++){
    d[i]=2000000000;
    pi[i] = -1;
    color[i]='W';
  }
  d[0]=0;
  while(1){
    mincost = 2000000000;
    for(i=0;i<n;i++){
      if(color[i]!='B' && d[i] < mincost){
	mincost = d[i];
        u = i;
      }
    }
    if(mincost==2000000000) break;
    color[u]='B';
  
  for(i=0;i<n;i++){
    if(color[i]!='B' && a[u][i]!=0  && d[u]+a[u][i]<d[i]){
      pi[i] = u;
      d[i]=d[u]+a[u][i];
     }
   }
  }
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)

const long long INFF = 1e18;

const int MAX_N = 11000;
using TYPE = long long; // ?????¢???????????\??????
vector<pair<int, TYPE> > G[MAX_N];

vector<TYPE> A_star(int start){
	vector<TYPE> dist(MAX_N, INFF);
	dist[start] = 0;//dist[i] :=???start->i?????§??????????????¢
	priority_queue<pair<TYPE, int>, vector<pair<TYPE, int> >, greater<pair<TYPE, int> > >  que;
	que.push(make_pair(1, start));
	while(!que.empty()){
		TYPE cost; int u;//????????§???????????£????????? ?????¨?????????
		cost = que.top().first, u = que.top().second;
		que.pop();
		// if(dist[u] < cost) continue;
		for (auto tmp : G[u]){
			int v = tmp.first; TYPE time = tmp.second;//??£??\???????????? ?????????????????§????????????
			if(dist[v] > dist[u] + time){//u->v
				dist[v] = dist[u] + time;
				TYPE h = 1; // ??´???????????§?????¨??????
				// printf("%f\n", h);
				que.push(make_pair(dist[v] + h, v));
			}
		}
	}
	return dist;
}

int main(void) {
	int n; cin >> n;
	rep(q, n) {
		int u, k; cin >> u >> k;
		vector<int> v(k); vector<long long> c(k);
		rep(i, k) cin >> v[i] >> c[i];
		rep(i, k) G[u].push_back(make_pair(v[i], c[i]));
	}
	auto dist = A_star(0);
	rep(i, n) printf("%d %d\n", i, dist[i]);
	return 0;
}