Go: package main

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

const (
	MAX_N      = 100
	MAX_WEIGHT = 100000
)

type Edge struct {
	start  int
	end    int
	weight int
}

type ShortestInfo struct {
	edges    []Edge
	shortest int
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	n, err := nextInt(sc)
	if err != nil {
		panic(err)
	}

	shortestList := make([]ShortestInfo, n)
	for i := 1; i < n; i++ {
		shortestList[i] = ShortestInfo{edges: []Edge{}, shortest: MAX_N*MAX_WEIGHT + 1}
	}

	adjacentMatrix, err := createAdjacentMatrix(n, sc)
	if err != nil {
		panic(err)
	}

	sssp([]int{1}, shortestList, adjacentMatrix)
	for _, v := range shortestList {
		fmt.Printf("%d %d\n", v.getEnd()-1, v.shortest)
	}
}

func (si ShortestInfo) getEnd() int {
	if len(si.edges) == 0 {
		return 1
	} else {
		return si.edges[len(si.edges)-1].end
	}
}

func createAdjacentMatrix(n int, sc *bufio.Scanner) ([][]int, error) {
	adjacentMatrix := make([][]int, n)
	for i := 0; i < n; i++ {
		id, err := nextInt(sc)
		if err != nil {
			return nil, err
		}
		adjacentMatrix[id] = make([]int, n)
		for j := 0; j < n; j++ {
			adjacentMatrix[id][j] = -1
		}
		vertexNum, err := nextInt(sc)
		if err != nil {
			return nil, err
		}
		for j := 0; j < vertexNum; j++ {
			v, err := nextInt(sc)
			if err != nil {
				return nil, err
			}
			c, err := nextInt(sc)
			if err != nil {
				return nil, err
			}
			adjacentMatrix[id][v] = c
		}
	}
	return adjacentMatrix, nil
}

func sssp(nodeStack []int, shortestList []ShortestInfo, adjacentMatrix [][]int) {
	for len(nodeStack) > 0 {
		currentNode := nodeStack[0]
		nodeStack = nodeStack[1:]
		currentShortest := getShortest(currentNode, shortestList)
		adjacents := findAdjacents(currentNode, adjacentMatrix)
		for i := 0; i < len(adjacents); i++ {
			adj := adjacents[i]
			if currentShortest.shortest+adj.weight < getShortest(adj.end, shortestList).shortest {
				setShortest(adj.end, adj, currentShortest, shortestList)
				nodeStack = append(nodeStack, adj.end)
			}
		}
	}
}

func getShortest(node int, shortestList []ShortestInfo) ShortestInfo {
	return shortestList[node-1]
}

func setShortest(node int, edge Edge, currentShortest ShortestInfo, shortestList []ShortestInfo) {
	newEdges := make([]Edge, len(currentShortest.edges)+1)
	for i := 0; i < len(newEdges)-1; i++ {
		newEdges[i] = currentShortest.edges[i]
	}
	newEdges[len(newEdges)-1] = edge
	shortestInfo := ShortestInfo{edges: newEdges, shortest: currentShortest.shortest + edge.weight}
	shortestList[node-1] = shortestInfo
}

func findAdjacents(currentNode int, adjacentMatrix [][]int) []Edge {
	adjacents := adjacentMatrix[currentNode-1]
	edges := []Edge{}
	for i, v := range adjacents {
		if v > 0 {
			edges = append(edges, Edge{start: currentNode, end: i + 1, weight: v})
		}
	}
	return edges
}

func nextInt(sc *bufio.Scanner) (int, error) {
	sc.Scan()
	return strconv.Atoi(sc.Text())
}

C++: //http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_12_B&lang=jp
#include<bits/stdc++.h>
#pragma warning(disable:4996)
using namespace std;
using ll = long long;
const int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 };
const int INF = numeric_limits<int>::max();
struct edge {
	int from, to, cost;
};
vector<int> dijkstra(int s, vector<vector<edge>>&graph) {//頂点sからほかのすべての頂点の最短距離を入れたvectorを返す
	//以下pair<int,int>はfirstは最短距離 secondは頂点番号
	int n = graph.size();
	priority_queue < pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>>que;
	vector<int>d(n, INF);//頂点sからの最短距離
	d[s] = 0;//スタート地点からスタート地点の距離はゼロ
	que.push(pair<int, int>(0, s));
	while (!que.empty()) {
		pair<int, int>p = que.top();
		que.pop();
		int v = p.second;
		for (int i = 0; i < graph[v].size(); i++) {
			edge e = graph[v][i];
			if (d[e.to] > d[v] + e.cost) {
				d[e.to] = d[v] + e.cost;
				que.push(pair<int, int>(d[e.to], e.to));
			}
	    }
	}
	return d;
}

int main() {
	int n;//頂点数
	cin >> n;
	vector<vector<edge>>graph;
	graph.resize(n);
	
	for (int i = 0; i < n; i++) {
		int u, k;
		cin >> u >> k;
		for (int j = 0; j < k; j++) {
			int to, cost;
			cin >> to >> cost;
			edge e;
			e.from = u;
			e.to = to;
			e.cost = cost;
			graph[u].push_back(e);
		}
	}
	vector<int> d=dijkstra(0, graph);
	for (int i = 0; i < n; i++) {
		cout << i << " " << d[i] << endl;
	}

}

C++: #include <iostream>
#include <cstdio>
#include <cstring>
#include <sstream>
#include <algorithm>
#include <math.h>
#include <map>
#include <functional>
#include <iomanip>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <typeinfo>
#define PI 3.14159265359
#define INF 99999999;
#define rep(i, n) for(int i=0; i<n; i++)
#define REP(n) rep(i, n)
#define EPS 1e-10
typedef long long ll;
using namespace std;
typedef pair<int, int> P;

double distanceAB(double xa, double ya, double xb, double yb);
//void trace(int A[], int N);

/*
class Target
{
public:
	vector <string> draw(int n)
	{

	}
};
*/


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];
	
	REP(n)
	{
		d[i] = INFTY;
		color[i] = WHITE;
	}
	
	d[0] = 0;
	color[0] = GRAY;
	while (1)
	{
		minv = INFTY;
		int u = -1;
		REP(n)
		{
			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;
				}
			}
		}
	}
	
	REP(n)
	{
		cout << i << " " << (d[i] == INFTY ? -1 : d[i]) << endl;
	}
}


int main()
{
	cin >> n;
	
	rep(i, n) rep(j, n) M[i][j] = INFTY;
	
	int k, c, u, v;
	rep(i, n)
	{
		cin >> u >> k;
		rep(j, k)
		{
			cin >> v >> c;
			M[u][v] = c;
		}
	}
	
	dijkstra();
	
	return 0;
}


/*
void trace(int A[], int N)
{
	REP(N)
	{
		if (i > 0) cout << " ";
		cout << A[i];
	}
	cout << endl;
}
*/


double distanceAB(double xa, double ya, double xb, double yb)
{
	return sqrt((xb-xa)*(xb-xa) + (yb-ya)*(yb-ya));
}

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

#define INF 100000000

#define White 0
#define Gray 1
#define Black 2

//重み付き隣接行列
int Tree[100][100];

//ダイクストラ

void dijkstra(int n){
  int u,minv; 

  //d = 最短コスト
  //p = 頂点vの親
  int d[100], p[100], color[100];

  //初期化

  for(int i = 0 ; i < n ; i++){
    d[i] = INF;
    color[i] = White;
  }

  d[0] = 0;
  p[0] = -1;
  color[0] = Gray;

  while(1){
    u = -1;
    minv = INF;

    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;

    //地点の更新

    for(int v = 0 ; v < n ; v++){
      if(color[v] != Black && Tree[u][v] != INF){
	if(d[v] > d[u] + Tree[u][v]){
	  d[v] = d[u] + Tree[u][v];
	  color[v] = Gray;
	}
      }
    }
  }
  for(int i = 0 ; i < n ; i++){
    cout << i << " ";
    if(d[i] == INF){
      cout << -1;
    }else{
      cout << d[i];
    }

    cout << endl;
  }
}

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

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

  for(int i = 0 ; i < n ; i++){
    cin >> u >> k;
    for(int j = 0 ; j < k ; j++){
      cin >> v >> c;
      Tree[u][v] =c;
    }
  }

  dijkstra(n);

  return 0;
}