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

#define NIL -1
#define WHITE 0
#define GRAY 1
#define BLACK 2
#define INF 1 << 21

//ダイクストラ法 優先度付きキューを用いた高速化
void dijkstra(vector<vector<pair<int, int> > > &graph, int n){

    priority_queue<pair<int, int> > PQ;
    vector<int> color(n, WHITE);
    vector<int> cost(n, INF);

    PQ.push(make_pair(0, 0));
    cost[0] = 0;
    color[0] = GRAY;

    while(!PQ.empty()){
        pair<int, int> f = PQ.top(); PQ.pop();
        int u = f.second;    //現在地

        color[u] = BLACK;

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

        rep(i, graph[u].size()){
            int v = graph[u][i].first;
            
            if(color[v] == BLACK) continue;

            if(cost[v] > cost[u] + graph[u][i].second){
                cost[v] = cost[u] + graph[u][i].second;
                PQ.push(make_pair(cost[v]*(-1), v));
                color[v] = GRAY;
            }
        }
    }

    rep(i, n){
        cout << i << " " << cost[i] << endl;
    }
}

int main() {

    int n;
    cin >> n;
    vector<vector<pair<int, int> > > graph(n);
    int k, c, u , v;
    rep(i, n){
        cin >> u >> k; //u 頂点  k 隣接リストの個数
        rep(j, k){
            cin >> v >> c;      //隣接リストの番号 //隣接リストの重み
            graph[i].push_back(make_pair(v, c));
        }
    }

    dijkstra(graph, n);

    return 0;
}

C++: #include <iostream>
#include <cstring>
#include <algorithm>
#include <vector>
#include <queue>
using namespace std;
#define fi first
#define se second
#define mkp make_pair
#define rep(i,n) for(int i=0; i<(n); ++i)
#define reps(i,f,n) for(int i=(f); i<=(n); ++i)
#define outl(x) cout << (x) << '\n'
#define FAST() cin.tie(0), ios::sync_with_stdio(false)
typedef pair<int,int> pii;
template<class A, class B>inline bool chmax(A &a, B b){return b>a ? a=b,1 : 0;}
template<class A, class B>inline bool chmin(A &a, B b){return b<a ? a=b,1 : 0;}
#define INF 0x3f3f3f3f

int N;
vector <pii> G[100005];
int mcos[100005];

void dijkstra(int s)
{
   priority_queue< pii, vector<pii>, greater<pii> > pq;
   pq.emplace( mkp(0,s) );
   memset( mcos, INF, sizeof(mcos) );
   mcos[s] = 0;

   while( !pq.empty() ){
      const pii tmp = pq.top(); pq.pop();
      if( mcos[tmp.se] < tmp.fi )continue;
      for( const auto& v: G[tmp.se] ){
         const int nc = v.fi + tmp.fi;
         if( chmin( mcos[v.se], nc ) )
            pq.emplace( mkp(nc, v.se) );
      }
   }
   return;
}

signed main()
{
   FAST();
   cin >> N;
   rep(i, N){
      int u, k, c, to;
      cin >> u >> k;
      while(k--){
         cin >> to >> c;
         G[i].emplace_back( mkp(c, to) );
      }
   }
   dijkstra(0);

   rep(i, N){
      cout << i << ' ' << mcos[i] << '\n';
   }
}

C++: #include<iostream>
#include<algorithm>
#include<queue>
using namespace std;
static const int MAX=10000;
static const int INF=(1<<20);
static const int WH=0;
static const int GRY=1;
static const int BL=2;

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

void DijkStra(){
  priority_queue<pair<int, int> > PQ;
  int color[MAX];
  int d[MAX];
  for(int i=0; i<n; i++)
  {
    d[i]=INF;
    color[i]=WH;
  }

  d[0]=0;
  PQ.push(make_pair(0, 0));
  color[0]=GRY;

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

    color[u]=BL;

    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] == BL) 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]=GRY;
      }
    }
  }

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

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

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

  DijkStra();

  return 0;
}