Go: package main

import (
	"bufio"
	"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
type Node struct {
	cost int
	done bool
}

type Edge struct {
	to, cost int
}

const INF = 1 << 60

func main() {
	sc := NewScanner()
	wtr := bufio.NewWriter(os.Stdout)
	N := sc.nextInt()
	nodes := make([]Node, N)
	for i := 0; i < N; i++ {
		nodes[i].cost = INF
	}
	E := make([][]Edge, N)
	for i := 0; i < N; i++ {
		id, k := sc.nextInt(), sc.nextInt()
		for j := 0; j < k; j++ {
			to, cost := sc.nextInt(), sc.nextInt()
			E[id] = append(E[id], Edge{to, cost})
		}
	}
	nodes[0].cost = 0
	for {
		cur := 0
		minCost := INF
		for i := 0; i < N; i++ {
			n := nodes[i]
			if !n.done && n.cost < minCost {
				cur = i
				minCost = n.cost
			}
		}
		if minCost == INF {
			break
		}
		nodes[cur].done = true
		for i := 0; i < len(E[cur]); i++ {
			to, cost := E[cur][i].to, E[cur][i].cost+nodes[cur].cost
			if !nodes[to].done && cost < nodes[to].cost {
				nodes[to].cost = cost
			}
		}
	}

	for i := 0; i < N; i++ {
		fmt.Fprintln(wtr, i, nodes[i].cost)
	}
	wtr.Flush()
}

C++: #include<bits/stdc++.h>
using namespace std;
static const int INF=1000000;
int n;
int G[100][100];
int d[100];
int color[100];

void dijkstra(){
  int minv;
  for(int i=0;i<n;i++){
    d[i]=INF;
    color[i]=0;
  }
  
  color[0]=1;
  d[0]=0;
  
  while(1){
    minv=INF;
    int u=-1;
    for(int i=0;i<n;i++){
      if(minv>d[i] && color[i] !=2){
        u=i;
        minv=d[i];
      }
    }
    if(u==-1) break;
    color[u]=2;
    
    for(int v=0;v<n;v++){
      if(color[v]!=2 &&G[u][v] !=INF){
        if(d[v]>d[u]+G[u][v]){
          d[v]=d[u]+G[u][v];
          color[v]=1;
        }
      }
    }
  }
  
  for(int i=0;i<n;i++){
    cout<<i<<" "<<d[i]<<endl;
  }
}

int main(){
  cin>>n;
  int u,k,v,c;
  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
      G[i][j]=INF;
    }
  }
  
  for(int i=0;i<n;i++){
    cin>>u>>k;
    for(int i=0;i<k;i++){
      cin>>v>>c;
      G[u][v]=c;
    }
  }
  
  dijkstra();
  return 0;
}

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

#define go first
#define ct second

int cost[100 + 10] , cost_ps[100 + 10];
int n,vf,k,v,c;

int v_k[100];

vector< pair<int, int> > went[100];

pair<int, int> p_tmp;

int  check_go(int st)
{
	int i;
	int ret=0;

	for (i = 0; i < v_k[st]; i++)
	{
		if (cost_ps[went[st][i].go] > cost[st] + went[st][i].ct || cost_ps[went[st][i].go] == -1)
		{
			cost_ps[went[st][i].go] = cost[st] + went[st][i].ct;
		}
	}

	for (i = 1; i < n; i++)
	{
		//cout << "Z" << i << endl;
		if ( (cost_ps[ret] > cost_ps[i] && cost[i]==-1 || cost[ret] != -1 ) && cost_ps[i]!=-1 )
		{
			//cout << "B" << cost[ret] << endl;
			ret = i;
			//printf("ret=%d\n", ret);
		}
	}
	//cout << cost_ps[ret] << endl;

	cost[ret] = cost_ps[ret];
	//cout << "A" << cost[ret] << endl;

	return ret;

}

int main()
{
	int i,j;
	int st_num=0;

	cin >> n;

	for (i = 0; i < n; i++)
	{
		cost[i] = cost_ps[i] = -1;

		cin >> vf ;
		cin >> v_k[vf];
		for (j = 0; j < v_k[vf] ; j++)
		{
			cin >> p_tmp.go >> p_tmp.ct;

			went[vf].push_back(p_tmp);
		}
	}

	cost[0] = cost_ps[0] = 0;

	for (i = 1; i < n; i++)
	{
		st_num = check_go(st_num);
	}

	for (i = 0; i < n; i++)
	{
		cout << i << " " << cost_ps[i] << endl;
	}

	return 0;
}

C++: #include<iostream>
#include<cstdio>
#define INF 1000000
#define NIL -2
#define GRAY -3
#define WHITE -4
#define BRACK -5

using namespace std;

int n;
int M[101][101];
int d[101];//重み
//int p[101];//親
int color[101];
int sum = 0;

void Dijkstra(int u) {
	//cout << u << endl;
	color[u] = BRACK;

	//重みの更新
	for (int i = 0; i < n; i++) {
		if (color[i] != BRACK && M[u][i] != 0) {
			color[i] = GRAY;
			if ((d[u] + M[u][i]) < d[i]) {
				d[i] = d[u] + M[u][i];
			}
		}
	}
	
	int min = -1;
	d[min] = 100000;


	for (int v = 0; v < n; v++) {
		if (color[v] != BRACK) {
			if (d[v] < d[min]) {
				min = v;
			}
			else {
				color[v] = WHITE;
			}
		}
	}

	if (min != -1) {
		Dijkstra(min);
	}
}

int main() {
	cin >> n;
	int v, k, g, weight; //v = 節点番号　g = 次数

	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			M[i][j] = 0;
		}
	}

	for (int i = 0; i < n; i++) {
		cin >> v >> g;
		for (int j = 0; j < g; j++) {
			cin >> k;
			cin >> M[i][k];
		}
	}

	for (int i = 1; i <= n; i++) {
		color[i] = WHITE;
	}

	for (int i = 0; i < n; i++) {
		d[i] = INF;
	}

	d[0] = 0;

	//関数
	Dijkstra(0);

	for (int i = 0; i < n; i++) {
		cout << i << " " << d[i] << endl;
	}

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define MAX 100
#define WHITE 0
#define BLACK 1
#define INFTY 100000001

// グラフの頂点数
int n;
// 隣接行列
vector<vector<int> > M(MAX, vector<int>(MAX, -1));
// 頂点の状態を表す配列
vector<int> color(MAX, WHITE);
// d[v]は始点sからS内の点のみを通ってvに行く経路の最小コスト
vector<int> d(MAX, INFTY);

void dijkstra()
{
  // 初期化
  d.at(0) = 0;

  // 初期状態でSの頂点数は0
  while (1)
  {
    // uはV-Sの頂点でd[u]が最小となるもの
    int u;
    int m = INFTY;
    for (int i = 0; i < n; i++)
    {
      // dが未設定の頂点については条件式の右の条件ではじかれる
      if (color.at(i) == WHITE && d.at(i) < m)
      {
        m = d.at(i);
        u = i;
      }
    }

    if (m == INFTY)
    {
      // V=Sとなったとき
      break;
    }

    // uをSに追加する
    color.at(u) = BLACK;

    // uに隣接するV-Sの頂点のdを更新する
    for (int i = 0; i < n; i++)
    {
      if (M.at(u).at(i) != -1 && color.at(i) == WHITE)
      {
        // iはuと隣接しているV-Sの頂点
        d.at(i) = min(d.at(i), d.at(u) + M.at(u).at(i));
      }
    }
  }
}

int main()
{
  cin >> n;
  for (int i = 0; i < n; i++)
  {
    int u, m;
    cin >> u >> m;
    for (int j = 0; j < m; j++)
    {
      int v, c;
      cin >> v >> c;
      M.at(u).at(v) = c;
    }
  }

  dijkstra();

  for (int i = 0; i < n; i++)
  {
    cout << i << " " << d.at(i) << endl;
  }
}