Go: package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

const MAX = 100
const INFTY = math.MaxInt64
const WHITE = 0
const GRAY = 1
const BLACK = 2

var n int
var M [MAX][MAX]int

func dijkstra() {
	var minv int
	var d [MAX]int
	var color [MAX]int

	for i := 0; i < n; i++ {
		d[i] = INFTY
		color[i] = WHITE
	}

	d[0] = 0
	color[0] = GRAY
	for {

		minv = INFTY
		u := -1
		for i := 0; i < n; i++ {
			if minv > d[i] && color[i] != BLACK {
				u = i
				minv = d[i]
			}
		}
		if u == -1 {
			break
		}

		color[u] = BLACK

		for v := 0; v < n; v++ {
			if color[v] != BLACK && M[u][v] != INFTY {
				if d[v] > d[u]+M[u][v] {
					d[v] = d[u] + M[u][v]
					color[v] = GRAY
				}
			}
		}

	}
	for i := 0; i < n; i++ {
		fmt.Printf("%v %v\n", i, d[i])
	}
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Scan()
	n, _ = strconv.Atoi(sc.Text())

	for i := 0; i < n; i++ {
		for j := 0; j < n; j++ {
			M[i][j] = INFTY
		}
	}

	for i := 0; i < n; i++ {
		sc.Scan()
		f, _ := strconv.Atoi(sc.Text())
		sc.Scan()
		k, _ := strconv.Atoi(sc.Text())
		for j := 0; j < k; j++ {
			sc.Scan()
			v, _ := strconv.Atoi(sc.Text())
			sc.Scan()
			c, _ := strconv.Atoi(sc.Text())
			M[f][v] = c
		}
	}
	dijkstra()
}

C++: #include <iostream>
using namespace std;
static const int MAX = 100;
static const int INFTY = (1<<21);

int main()
{
  int n;
  int M[MAX][MAX];

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

  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;
      M[u][v] = c;
    }
  }

  int d[MAX];
  bool visited[MAX];
  for (int i = 0; i < n; ++i)
  {
    d[i] = INFTY;
    visited[i] = false;
  }
  d[0] = 0;
  
  while (true)
  {
    int minv = INFTY;
    int u = -1;
    for (int i = 0; i < n; ++i)
    {
      if (!visited[i] && minv > d[i])
      {
        minv = d[i];
        u = i;
      }
    }
    if (u == -1) break;

    visited[u] = true;
    for (int v = 0; v < n; ++v)
    {
      if (!visited[v] && M[u][v] != INFTY)
      {
        if (d[v] > d[u] + M[u][v])
        {
          d[v] = d[u] + M[u][v];
        }
      }
    }
  }

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

  return 0;
}

C++: #include<iostream>
using namespace std;
static const int MAX =100;
static const int INFTY = (1<<21);
static const int WHITE = 0;
static const int GRAY =1;
static const int BLACK=2;

int n, M[MAX][MAX];

void dijkstra(){
  int minv;
  int d[MAX],color[MAX];

  for(int i = 0;i<n;i++){
    d[i]=INFTY;
    color[i]=WHITE;
  }
  d[0]=0;
  color[0]=GRAY;
  while(1){
    minv=INFTY;
    int u=-1;
    for(int i=0;i<n;i++){
      if(minv>d[i]&&color[i]!=BLACK){
      u=i;
      minv=d[i];
    }
  }
  if(u==-1)break;
  color[u]=BLACK;
  for(int v =0;v<n;v++){
    if(color[v]!=BLACK&& M[u][v]!=INFTY){
      if(d[v]>d[u]+M[u][v]){
      d[v]=d[u][v]+M[u][v];

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

int main(){
  cin >>n;

  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){

      M[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;
      M[u][v]=c;
    }
  }
  dijkstra();

  return 0;
}