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
	sum     int         // 始点からの距離
	color   color
}

func (p *node) getMinToMst() int {
	if p.parent == nil {
		return math.MaxInt32
	}
	return p.weights[p.parent.num]
}

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, 0, 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].parent = nodes[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.getMinToMst() < min {
				min = v.getMinToMst()
				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
		// 自分の親の合計値と合算する
		minNode.sum = minNode.parent.sum + min

		// MSTに属していない頂点それぞれについて,MSTとの最小の重みの距離を加算
		for _, v := range nodes {
			if v.color == mst {
				continue
			}
			w, ok := v.weights[minNode.num]
			if !ok {
				// minNodeと接してない
				continue
			}

			if w < v.getMinToMst() {
				// minNodeへの距離がもっとも重みが少ないので親を変更
				v.parent = minNode
			}
		}
	}

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

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<iostream>
#include<vector>
#include<queue>
#define INF 1000000000

using namespace std;

struct vEdge {
	int adj;
	vector<int> weight;
	vector<int> tovtx;
	vEdge() {}

	void setadj(int a) { adj = a; }

	void setnum(int w, int n2) {
		weight.push_back(w); tovtx.push_back(n2);
	}
};

void dijkstra0(const vector<vEdge>& vedge, vector<int>& cost) {
	int mindex, min, temp, v,w, size = vedge.size(), count = 1;
	vector<bool> optimum(size, false);
	queue<int> qdata;
	cost.at(0) = 0; optimum.at(0) = true;

	while (count < size) {
		mindex = -1; min = INF;
		for (int i = 0; i < size; i++) if (optimum.at(i)) {
			for (int j = 0; j < vedge.at(i).adj;j++){
				v = vedge.at(i).tovtx.at(j);
				if (!optimum.at(v)) {
					w = vedge.at(i).weight.at(j);
					temp = cost.at(i) + w;
					if (temp < min) {
						min = temp;
						mindex = v;
					}
					if (temp < cost.at(v)) cost.at(v) = temp;
				}
			}
		}
		optimum.at(mindex) = true;
		count++;
	}

}

int main(void) {
	int size, num, adj, w, n2;
	cin >> size;

	vector<int> cost(size, INF);
	vector<vEdge> vedge(size);

	for (int i = 0; i < size; i++) {
		cin >> num >> adj;
		vedge.at(num).setadj(adj);
		for (int j = 0; j < adj; j++) {
			cin >> n2 >> w;
			vedge.at(num).setnum(w, n2);
		}
	}
	dijkstra0(vedge, cost);

	for (int i = 0; i < size; i++) cout << i << " " << cost.at(i) << endl;
	return 0;

}

C++: #include<bits/stdc++.h>
#define INF 0x3f3f3f3f 
using namespace std;
const int maxn = 11111;
int n, m;
struct edge
{
	int v, cost;
	edge(int _v=0,int _cost=0):v(_v),cost(_cost){}
};
vector<edge> g[maxn];
bool book[maxn];
int dis[maxn];
void myinit()
{
	memset(book, 0, sizeof(book));
	for (int i = 0; i < maxn; i++)
	{
		g[i].clear();
	}
	fill(dis, dis + maxn,INF);
}
void SPFA(int s)
{
	queue<int> q;
	q.push(s);
	book[s] = 1;//加入队列并标记 
	while (!q.empty())
	{
		int temp = q.front();
		q.pop();
		book[temp] = 0;//弹出队列并取消标记 
		for (int i = 0; i < g[temp].size(); i++)
		{
			if (g[temp][i].cost + dis[temp] < dis[g[temp][i].v])//比较 
			{
				dis[g[temp][i].v] = g[temp][i].cost + dis[temp];//更新路径 
				if (!book[g[temp][i].v])//若该点不在队列 
				{
					q.push(g[temp][i].v);
					book[g[temp][i].v] = 1;
				}
			}
		}
	}
}
void addedge(int u, int v, int w)
{
	g[u].push_back(edge(v, w));
}
int main()

{
	cin >> n;
	m = 0;
	myinit();
	for (int i = 0;i < n;i++)
	{
		int ve, en, co;
		int k;
		cin >> ve >> k;
		for (int j = 0;j < k;j++)
		{
			cin >> en >> co;
			addedge(ve, en, co);
		}
	}
	dis[0] = 0;
	SPFA(0);
	for (int i = 0;i < n;i++)
		cout << i << " " << dis[i] << endl;
	return 0;
}

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

#define INF 1000000 //极大的数 
const int N = 1009;

int d[N],v[N],w[N][N]; //d[i]为起始点到i的最短路径   v[i]为标记数组    w[x][y]表示边(x,y)的长度. 
int main(){
	int n,m,a,b,c,beg,end;
	while((scanf("%d",&n))!=EOF){
		memset(w,0,sizeof(w));
		memset(d,0,sizeof(d));
		memset(v,0,sizeof(v));
		for(int i=0;i<n;i++){
			scanf("%d%d",&a,&m);
			for(int j=0;j<m;j++){
				scanf("%d%d",&b,&c);
				w[i][b] = w[b][i] = c;
			}
		}
		for(int i=0;i<n;i++) d[i] = (i==0?0:INF);
		for(int i=0;i<n;i++){
			int x,a = INF; 
			for(int y=0;y<n;y++)
				if(!v[y]&&d[y]<=a) a = d[x=y];
				v[x] = 1;
		for(int j=0; j<n; j++)
                if(!v[j] && w[x][j] && d[x]+w[x][j] < d[j])
                    d[j] = d[x]+w[x][j];
		}
		for(int i=0;i<n;i++){
			printf("%d %d\n",i,d[i]);
		}
	}	
}

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] + 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;
}

C++: #include<iostream>
int main(){
  int u,k,C,V,A[1000][1000],D[1000][1000],n;
  std::cin >> n;
  for(int i=0;i<n;i++)for(int j=0;j<n;j++)D[i][j] = 200001;
  for(int i=0;i<n;i++){     std::cin >> u >> k;
    for(int j=0;j<k;j++){   std::cin >> V >> C;
      D[u][V] = C;}}
  for(int i=0;i<n;i++)D[i][i] = 0;
  for(int k=0;k<n;k++)for(int i=0;i<n;i++)for(int j=0;j<n;j++)D[i][j]= std::min(D[i][j],D[i][k] + D[k][j]);
  for(int i=0;i<n;i++)std::cout << i << " " << D[0][i] << std::endl;
  return 0;
}