Go: // ダイクストラのアルゴリズム
package main

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

type color int

const (
	white color = iota // 未訪問
	mst                // MSTとして確定
)

// 頂点
type node struct {
	num       int         // 頂点の番号
	weights   map[int]int // 重みMAP
	parent    *node       // MSTへの重み最小の親
	distFromS int         // 始点からの距離
	color     color
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	n := eGetInt(scanner)

	nodes := make([]*node, n)
	for i := 0; i < n; i++ {
		weights := eAtoi((strings.Fields(eGetline(scanner))))
		v := &node{weights[0], make(map[int]int, weights[1]), nil, math.MaxInt32, white}
		for j := 0; j < weights[1]; j++ {
			k := weights[j*2+2] // 相手の頂点名
			w := weights[j*2+3] // 重み
			v.weights[k] = w
		}
		nodes[i] = v
	}

	// 初回はnode[0]がMSTに入るように
	nodes[0].distFromS = 0

	for { // 全部チェックするまで

		// どの頂点を新たにMSTに取り込むか

		var minNode *node
		min := math.MaxInt32
		for _, v := range nodes {
			if v.color == mst {
				continue
			}
			if v.distFromS < min {
				min = v.distFromS
				minNode = v
			}
		}
		if minNode == nil {
			// すべて完了している.
			break
		}

		// MSTに追加する頂点決定
		minNode.color = mst

		// fmt.Printf(">[%v]\n", minNode)
		// MSTに属していない頂点それぞれについて,Startからの最小の重みの距離を更新
		for i, v := range nodes {
			if v.color == mst {
				continue
			}
			w, ok := minNode.weights[i]
			if !ok {
				// minNodeと接してない
				continue
			}

			if minNode.distFromS+w < v.distFromS {
				// minNode経由の距離がもっとも重みが少ないので親を変更
				v.distFromS = minNode.distFromS + w
				v.parent = minNode
				// fmt.Printf("[%v %v]\n", v, minNode)
			}
		}
		// fmt.Printf("<\n")
	}

	for i, v := range nodes {
		fmt.Printf("%d %d\n", i, v.distFromS)
	}
}

func eGetInt(scanner *bufio.Scanner) int {
	t := eAtoi(strings.Fields(eGetline(scanner)))
	return t[0]
}

func eGetline(p *bufio.Scanner) string {
	if !p.Scan() {
		if err := p.Err(); err != nil {
			log.Fatal(err.Error())
		}
		return ""
	}
	return p.Text()
}

func eAtoi(s []string) []int {
	ints := make([]int, len(s))
	var err error
	for i, e := range s {
		ints[i], err = strconv.Atoi(e)
		if err != nil {
			log.Fatal(err.Error())
		}
	}
	return ints
}

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;
}

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 func(){
  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]+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;
    }
  }
  func();
  return 0;
}

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

struct Node
{
    vector<int> cost;
    vector<int> vertex;

    bool visited = false;
    int minCost = 100000000;
};

int N;
vector<Node> firstNodes(100);

int findNode(const vector<Node>& nodes)
{
    int minCost = 1000000000;
    int index = -1;
    for (int i = 0; i < nodes.size(); i++)
    {
        if(minCost > nodes[i].minCost && !nodes[i].visited)
        {
            minCost = nodes[i].minCost;
            index = i;
        }   
    }
    return index;
}

int main()
{
    cin >> N;
    int u;
    int k;
    int temp;
    for(int i = 0;i < N;i++)
    {
        cin >> u;
        cin >> k;
        for(int i = 0;i < k;i++)
        {
            cin >> temp;
            firstNodes[u].vertex.push_back(temp);
            cin >> temp;
            firstNodes[u].cost.push_back(temp);
        }
    }

    firstNodes[0].minCost = 0;
    
    for(int vi = 0;vi < N;vi++)
    {
        vector<Node> nodes = firstNodes;
        while(nodes[vi].visited != true)
        {
            //find a node that is visited and has minimum cost
            int index = findNode(nodes);

            Node& minNode = nodes[index];
            int vertex;
            int cost;
            minNode.visited = true;
            for (size_t i = 0; i < minNode.vertex.size(); i++)
            {
                vertex = minNode.vertex[i];
                cost = minNode.cost[i];
                nodes[vertex].minCost = min(nodes[vertex].minCost,minNode.minCost + cost);
            }
        }
        cout << vi << " " << nodes[vi].minCost << endl;
    }
}