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>
#define rep(i, n) for(int i = 0; i < (n); ++i)

using namespace std;
using ll = long long;
using v1 = vector<int>;
using vl = vector<long long>;
using v2 = vector<vector<int>>;
using v3 = vector<vector<char>>;

static const int MAX = 100000;
static const int BLACK = -1;
static const int WHITE = 0;
static const int GLAY = 1;
static const int INFTY = 1e9;

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

void pdai(){
	priority_queue<pair<int, int>> PQ;
	int d[MAX];
	int color[MAX];
	rep(i, n){
		d[i] = INFTY;
		color[i] = WHITE;
	}
	PQ.push(make_pair(0, 0));
	color[0] = GLAY;
	d[0] = 0;
	while(!PQ.empty()){
		pair<int, int> f = PQ.top();PQ.pop();
		int u = f.second;
		color[u] = BLACK;
		if(d[u] < f.first*(-1)) continue;
		for(int i = 0; i < adj[u].size(); i++){
			int v = adj[u][i].first;
			if(color[v] != BLACK && d[v] > d[u] + adj[u][i].second){
				d[v] = d[u] + adj[u][i].second;
				PQ.push(make_pair(d[v]*(-1), v));
				color[v] = GLAY;
			}
		}
	}
	rep(i, n){
		if(d[i] == INFTY) d[i] = -1;
		cout << i << " " << d[i] << endl;
	}
}

int main(){
	cin >> n;
	int u, k, v, c;
	rep(i, n){
		cin >> u >> k;
		rep(j, k){
			cin >> v >> c;
			adj[u].push_back(make_pair(v, c));
		}
	}
	pdai();
}

C++: #include <iostream>
#include <vector>
#include <queue>
#define INF 1e9
using namespace std;

int main(){
    //declaration and input
    int n;
    cin >> n;
    int u, k;
    vector<vector<pair<int, int>>> graph(n);
    for (int i = 0; i < n; i++){
        cin >> u >> k;
        int v, c;
        for (int j = 0; j < k; j++){
            cin >> v >> c;
            graph[u].push_back(make_pair(c, v));
        }
    }
    vector<int> cost(n, INF);
    vector<bool> is_visit(n, false);
    vector<int> parent_of(n, -1);

    //dijkstra
    //init
    cost[0] = 0;
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> que;
    que.push(make_pair(0, 0));

    //loop
    while (!que.empty()){
        pair<int, int> p = que.top();
        que.pop();
        int c = p.first; //cost
        int v = p.second; //vertax
        is_visit[v] = true;
        if (c > cost[v])
            continue;
        for (int i = 0; i < graph[v].size(); i++){
            if (!is_visit[graph[v][i].second]){
                if (cost[v] + graph[v][i].first < cost[graph[v][i].second]){
                    cost[graph[v][i].second] = cost[v] + graph[v][i].first;
                    que.push(make_pair(cost[graph[v][i].second], graph[v][i].second));
                    parent_of[graph[v][i].second] = v;
                }
            }
        }
    }

    //output
    for (int i = 0; i < n; i++){
        cout << i << ' ' << cost[i] << endl;
    }
    return 0;
}

C++: #include<cstdio>
#include<iostream>
#include<stack>
#include<vector>
#include<algorithm>
#include<cstring>
#include<cstdlib>
#define _USE_MATH_DEFINES // M_PI????????????????????????
#include<math.h>
#include<queue>
#pragma warning(disable:4996)
using namespace std;

static const int MAX = 10000;
static const int INFTY = (1<<20);
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 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] = INFTY;
		color[i] = WHITE;
	}

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

	while( !PQ.empty() ){
		pair<int,int>f = PQ.top();
		PQ.pop();
		int u = f.second;
		color[u] = BLACK;
		// ????°???????????????????????????????????????§???????????°??????
		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]==BLACK ) continue;
			if( d[v]>d[u]+adj[u][j].second ){
				d[v] = d[u] + adj[u][j].second;
				// priority_queue????????????????????§??§??????????????????????????????-1????????????
				PQ.push(make_pair(d[v]*(-1),v));
				color[v] = GRAY;
			}
		}
	}
	
	for(int i=0; i<n; i++){
		cout << i << " " << ( d[i]==INFTY ? -1 : d[i] ) << "\n";
	}
}

int main(){
	int k, u, v, c;
	cin >> n;

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