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 <iostream>
using namespace std;
#define MAX 100
#define INFTY 1<<22
#define WHITE 0
#define GRAY 1
#define BLACK 2

int gMatrix[MAX][MAX];

void dijkstra(int n){
    // 最小の重みを記録する
    int minV;
    int weight[MAX];
    int color[MAX];
    
    for(int i = 0;i < n;++i){
        weight[i] = INFTY;
        color[i] = WHITE;
    }
    // 始点
    weight[0] = 0;
    color[0] = GRAY;
    
    while(1){
        minV = INFTY;
        // 頂点
        int u = -1;
        for(int i = 0;i < n;++i){
            if(minV > weight[i] && color[i] != BLACK){
                u = i;
                minV = weight[i];
            }
        }
        if(u == -1)break;
        color[u] = BLACK;
        
        for(int v = 0;v < n;++v){
            if(color[v] != BLACK && gMatrix[u][v] != INFTY){
                if(weight[v] > weight[u] + gMatrix[u][v]){
                    weight[v] = weight[u] + gMatrix[u][v];
                    color[v] = GRAY;
                }
            }
        }
    }
    // 出力
    for(int i = 0;i < n;++i){
        cout << i << " " << ( weight[i] == INFTY ? -1 : weight[i] ) << endl;
    }
}

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

C++: #include<bits/stdc++.h>
using namespace std;
static const int INFTY = (1 << 21);
static const int BLACK = 1;
static const int Maxn = 110;

int n, M[Maxn][Maxn], p[Maxn], d[Maxn], color[Maxn];
void dijkstra(){
	for(int i = 0; i < n; i++){
		d[i] = INFTY;
		p[i] = -1;
	}
	d[0] = 0;
	while(1){
		int minv = INFTY, u = -1;
		for(int i = 0; i < n; i++){
			if(d[i] < minv && color[i] != BLACK){
				minv = d[i];
				u = i;
			}
		}
		if(u == -1) break;
		color[u] = BLACK;
		for(int v = 0; v < n; v++){
			if(color[v] != BLACK && M[u][v] + d[u] < d[v]){
				d[v] = M[u][v] + d[u];
				p[v] = u;
			}
		}
	}
	for(int i = 0; i < n; i++) cout << i << " " << d[i] << endl;
}
int main()
{
	memset(M, -1, sizeof(M));
	int u, k, t, c;
	cin >> n;
	for(int i = 0; i < n; i++){
		cin >> u >> k;
		while(k--){
			cin >> t >> c;
			M[u][t] = c;
		}
		for(int j = 0; j < n; j++) 
			if(M[u][j] == -1)  M[i][j] = INFTY;
	}	
	/*for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++) cout << M[i][j] << " ";
		cout << "\n";
	}*/
	dijkstra();
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;

const int MAX = 110;
const int INF = INT_MAX;

int edge[MAX][MAX];
int dist[MAX];

void dijkstra(int s, int n)
{
  queue<int> que;

  dist[s] = 0;
  que.push(s);
  while (!que.empty()) {
    int u = que.front(); que.pop();
    for (int v = 0; v < n; v++) {
      if (edge[u][v] != -1 && (dist[v] == INF || dist[v] > dist[u] + edge[u][v])) {
        dist[v] = dist[u] + edge[u][v];
        que.push(v);
      }
    }
  }
}

int main()
{
  int n; cin >> n;

  memset(edge, -1, sizeof(edge));
  fill(dist, dist+n, INF);

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

  dijkstra(0, n);

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

  return EXIT_SUCCESS;
}

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

#define MAX_VERTEX 100
#define INF 1000000

int vertex_num; // ???????????°
int d[MAX_VERTEX][MAX_VERTEX];  // ???????????¢???d[?§????][??????]??§?§??????????????????????????????¢?????¨???

void Input() {
  cin >> vertex_num;

  // (a1) ??\???????????¶??§?????????
  // d?????¨???INF?????????????§??????¨????????????????????´???0
  for (int i = 0; i < vertex_num; i++) {
    for (int j = 0; j < vertex_num; j++) {
      d[i][j] = i == j ? 0 : INF;
    }
  }

  for (int i = 0; i < vertex_num; i++) {
    int vertex, out;
    cin >> vertex >> out;
    for(int j = 0; j < out; j++) {
      int to, c;
      cin >> to >> c;
      d[vertex][to] = c;
    }
  }
}

void WarshallFloyd() {
  for (int k = 0; k < vertex_num; k++) {
    for (int i = 0; i < vertex_num; i++) {
      for (int j = 0; j < vertex_num; j++) {
        d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
      }
    }
  }
}

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

int main() {

  Input();
  WarshallFloyd();
  Output();

  return 0;
}