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

const int NOTV = 0;
const int VIST = 1;
const int NMAX = 100;
const int VMAX = 2000;
const int NILL = -1;
const int INF = 1 << 21;
int a[NMAX][NMAX];  //??£??\??????
int n;
//priority_queue <greater<int>> pq;

void dijkstra(){

	int p[NMAX];
	int d[NMAX];
	int vst[NMAX];
	int minc;
	for (int i = 0; i < n; i++) {
		vst[i] = NOTV;
		d[i] = INF;
	}
	d[0] = 0;
	p[0] = -1;
	while (1) {
		minc = INF;
		int u;
		for (int i = 0; i < n; i++) {
			if (minc > d[i] && vst[i]==NOTV) {
				u = i;
				minc = d[i];
			}
		}
		if (minc == INF) break;
		vst[u] = VIST;
		for (int v = 0; v < n; v++) {
			if (vst[v] == NOTV && a[u][v] != INF) {
				if (d[u] + a[u][v] < d[v]) {
					d[v] = d[u] + a[u][v];
					vst[v] = NOTV;
				}
			}

		}
	}
	for (int i = 0; i < n; i++) {
		cout << i << ' ' << ((d[i] == INF) ? -1 : d[i]) << endl;
	}
}

int main() {
	cin >> n;
	int um;
	int uo;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			a[i][j] = INF;
		}
	}
	for (int i = 0; i < n; i++) {
		cin >> um;
		int k;
		cin >> k;
		for (int j = 0; j < k; j++) {
			cin >> uo;
			cin >> a[um][uo];
		}
		
	}
	
	dijkstra();
	return 0;
}

C++: import java.util.Arrays;
import java.util.Scanner;

public class Main {
	static int N;
	static int W[][], distance[], state[];
	static final int INF = 1000000000;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		N = sc.nextInt();

		W = new int[N][N];
		distance = new int[N];
		state = new int[N];

		for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				W[i][j] = INF;
			}
		}

		for (int i = 0; i < N; i++) {
			sc.nextInt(); // u を読み飛ばし
			int k = sc.nextInt();
			for (int j = 0; j < k; j++) {
				int v = sc.nextInt();
				int c = sc.nextInt();
				W[i][v] = c;
			}
		}
		dijkstra(0);
		for (int i = 0; i < N; i++) {
			System.out.println(i + " " + distance[i]);
		}
	}

	private static int min(int a, int b) {
		if (a < b)
			return a;
		return b;
	}

	private static void dijkstra(int start) {
		// Arrasys.fill は配列の初期化がデキル便利メソッド．ただし1次元配列のみ
		Arrays.fill(distance, INF);
		Arrays.fill(state, 0);
		distance[start] = 0;

		int p = 0; // 確定頂点番号を保存する変数
		for (int step = 0; step < N; step++) {
			int minimum = INF;
			for (int x = 0; x < N; x++) {
				if (state[x] == 0 && distance[x] < minimum) {
					p = x;
					minimum = distance[x];
				}
			}
			if (minimum == INF) {
				System.err.println("Disconnected Graph!\n");
				System.exit(-1);
			}
			state[p] = 1;
			for (int x = 0; x < N; x++)
				distance[x] = min(distance[x], distance[p] + W[p][x]);
		}

	}
}

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

static const int MAX = 100;
static const int INFTY = 1000000000;
static const int WHITE = 0, BLACK = 2;

int n;
int A[MAX][MAX];
int d[MAX], color[MAX];

void sssp() {
	for (int i = 0; i < n; i++) {
		d[i] = INFTY;
		color[i] = WHITE;
	}

	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 j = 0; j < n; j++) { 
			if (A[u][j] < INFTY && color[j] != BLACK) {
				d[j] = min(d[j], d[u] + A[u][j]);
			}
		}
	}
}

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

	sssp();

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

	return 0;
}