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 maxn = 1111;
#define INF 0x3f3f3f
int n;
struct qnode
{
	int v, c;
	qnode(int _v=0,int _c=0):v(_v),c(_c){}
	bool operator < (const qnode &r)const
	{
		return c > r.c;
	}
};
struct Edge
{
	int v,cost;
	Edge(int _v=0,int _cost =0):v(_v),cost(_cost){}
};
vector<Edge> E[maxn];
bool vis[maxn];
int dis[maxn];
void Dijkstra(int n, int s)
{
	memset(vis, false, sizeof(vis));
	fill(dis, dis + n, INF);
	priority_queue<qnode> que;
	while (que.size())que.pop();
	dis[s] = 0;
	que.push(qnode(s, 0));
	qnode temp;
	while (que.size())
	{
		temp = que.top();
		que.pop();
		int u = temp.v;
		if (vis[u])
			continue;
		vis[u] = true;
		for (int i = 0;i < E[u].size();i++)
		{
			int v = E[u][i].v;
			int cost = E[u][i].cost;
			if (!vis[v] && cost + dis[u] < dis[v])
			{
				dis[v] = dis[u] + cost;
				que.push(qnode(v, dis[v]));
			}
		}
	}
}
void addedge(int u, int v, int w)
{
	E[u].push_back(Edge(v, w));
}
int main()
{
	cin >> n;
	for (int i = 0;i < n;i++)
	{
		int a, b, w,k;
		cin >> a >> k;
		for (int j = 0;j < k;j++)
		{
			cin >> b >> w;
			addedge(a, b, w);
		}
	}
	Dijkstra(n,0);
	for (int i = 0;i < n;i++)
	{
		cout<<i<<" "<< dis[i] << endl;
	}
	return 0;
}

C++: #include<iostream>
using namespace std;
static const int MAX = 1000;
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 < n; j++ ) {
      cin >> v >> c;
      M[u][v] = c;
    }
  }

  dijkstra();

  return 0;
}

C++: #include<iostream>
using namespace std;
static const int M = 100;
static const int INF = (1 << 21);
static const int W = 0;
static const int G = 1;
static const int B = 2;

int n, m[M][M];


void dijk() {
	int u, minv;
	int i, v, d[M], c[M];

	for (i = 0; i < n; i++) {
		d[i] = INF;
		c[i] = W;
	}
	d[0] = 0;
	c[0] = G;
	while (1) {
		minv = INF;
		u = -1;
		for (i = 0; i < n; i++) {
			if (minv > d[i] && c[i] != B) {
				u = i;
				minv = d[i];
			}
		}
		if (u == -1) {
			break;
		}
		c[u] = B;
		for (v = 0; v < n; v++) {
			if (c[v] != B && m[u][v] != INF) {
				if (d[v] >(d[u] + m[u][v])) {
					d[v] = d[u] + m[u][v];
					c[v] = G;
				}
			}
		}
	}
	for (i = 0; i < n; i++) {
		cout << i << " " << (d[i] == INF ? -1 : d[i]) << endl;
	}
}

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

C++: #include <iostream>
using namespace std;
const int MAXn=100;
const int INFTY=1<<21;

int n,M[MAXn][MAXn],col[MAXn],d[MAXn],p[MAXn];

void dijkstra(int s)
{
	for(int i=0;i<n;i++)
	{
		col[i]=0;
		d[i]=INFTY;
	}
	d[s]=0;
	p[s]=-1;
	
	while(1)
	{
		int mincost=INFTY;
		int u;
		for(int i=0;i<n;i++)
		{
			if(col[i]!=2&&d[i]<mincost)
			{
				mincost=d[i];
				u=i;
			}
		}
		if(mincost==INFTY)break;
		col[u]=2;
		for(int v=0;v<n;v++)
		{
			if(col[v]!=2&&M[u][v]!=INFTY)
			{
				if(d[u]+M[u][v]<d[v])
				{
					d[v]=d[u]+M[u][v];
					p[v]=u;
					col[v]=1;
				}
			}
		}
	}
	
	for(int i=0;i<n;i++)cout<<i<<" "<<(d[i]==INFTY?-1:d[i])<<endl;
	
	return;
}

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

C++: #include<bits/stdc++.h>
#define INF 999999999
using namespace std;

int G[110][110] = {};
int mini[110];
int used[110];

void dijkstra(int n)
{
    //init
    for(int i = 0;i < n;i++){
        mini[i] = INF;
        used[i] = 0;
    }
    mini[0] = 0;

    while(true)
    {
        int v = -1;
        for(int i = 0;i < n;i++){
            if(!used[i] && (v == -1 || mini[i] < mini[v])) v = i;
        }
        if(v == -1) break;
        used[v] = 1;

        for(int i = 0;i < n;i++){
            mini[i] = min(mini[i], mini[v]+G[v][i]);
        }
    }
}

int main()
{
    int n;
    int u, k, v, c;

    cin >> n;
    
    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 j = 0;j < k;j++){
            cin >> v >> c;
            G[u][v] = c; //uiとviをつなぐコストがci
        }
    }
    dijkstra(n);
    
    for(int i = 0;i < n;i++) printf("%d %d\n", i, mini[i]);
    
    return 0;
}