Go: package main

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

const (
	white int = iota
	gray
	black
)

type node struct {
	id     int
	parent int
	edge   []int
	weight []int
	color  int
}

type graph struct {
	nodes    []node
	distance []int
}

var infty = 1 << 32
var null = -1

func constructgraph() *graph {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	n := nextInt(sc)

	g := &graph{make([]node, n), make([]int, n)}

	for i := 0; i < n; i++ {
		id := nextInt(sc)
		edges := nextInt(sc)
		n := node{}
		n.id = id
		n.edge = make([]int, edges)
		n.weight = make([]int, edges)
		n.color = white
		for j := 0; j < edges; j++ {
			to := nextInt(sc)
			w := nextInt(sc)
			n.edge[j] = to
			n.weight[j] = w
		}
		g.nodes[id] = n
	}
	return g
}

func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	v, _ := strconv.Atoi(sc.Text())
	return v
}

func (g *graph) preparedijkstra(s int) {
	for i := 0; i < len(g.nodes); i++ {
		g.nodes[i].color = white
		g.nodes[i].parent = null
		g.distance[i] = infty
	}
	g.distance[s] = 0
}

func (g *graph) dijkstra(s int) []int {
	g.preparedijkstra(s)

	for {
		var u int
		mincost := infty
		for i, d := range g.distance {
			if g.nodes[i].color != black && mincost > d {
				mincost = d
				u = i
			}
		}

		if mincost == infty {
			break
		}

		g.nodes[u].color = black

		for i, e := range g.nodes[u].edge {
			if g.nodes[e].color != black {
				if g.distance[e] > g.distance[u]+g.nodes[u].weight[i] {
					g.distance[e] = g.distance[u] + g.nodes[u].weight[i]
					g.nodes[e].parent = u
					g.nodes[e].color = gray
				}
			}
		}
	}
	return g.distance
}

func printShortestPath(d []int) {
	for i, v := range d {
		fmt.Printf("%d %d\n", i, v)
	}
}

func main() {
	g := constructgraph()
	d := g.dijkstra(0)
	printShortestPath(d)
}

C++: #include <iostream>
#include <vector>
#include <climits>

class Nodes;

class Node {
public:
    Node(int n) : id(n), cost(INT_MAX) { }
    void addEdge(int to, int cost) { edgesTo.push_back(to); edgesCost.push_back(cost); }
    int getId() { return id; }
    int getCost() { return cost; }
    void setCost(int alt) { cost = alt; }
    void print() { std::cout << id << " " << cost << std::endl; }
    void printAll() {
        std::cout << id << " " << cost;
        for (std::vector<int>::iterator itr = edgesTo.begin(), itr2 = edgesCost.begin();  itr != edgesTo.end(); ++itr, ++itr2) {
            std::cout << " " << *itr << " " << *itr2;
        }
        std::cout << std::endl;
    }
    void updatesCost(Nodes* nodes);
private:
    int id;
    std::vector<int> edgesTo;
    std::vector<int> edgesCost;
    int cost;
};

class Nodes {
public:
    void readFromIn() {
        int size;
        std::cin >> size;
        for (int i=0; i<size; ++i) {
            int id;
            int sizeOfEdges;
            std::cin >> id >> sizeOfEdges;
            Node *node = new Node(id);
            for (int j=0; j<sizeOfEdges; ++j) {
                int to;
                int cost;
                std::cin >> to >> cost;
                node->addEdge(to, cost);
                //std::cout << to << cost << std::endl;
            }
            nodes.push_back(node);
        }
        nodes[0]->setCost(0);
    }
    std::vector<Node*>::iterator findNodeWithTheLeastDistance(std::vector<Node*> &queue) {
        std::vector<Node*>::iterator min=queue.begin();
        for (std::vector<Node*>::iterator itr=queue.begin()+1; itr != queue.end(); ++itr) {
            if ((*min)->getCost() > (*itr)->getCost()) {
                min = itr;
            }
        }
        return min;
    }
    void dijkstrasAlgorithm() {
        std::vector<Node*> queue(nodes);

        while (!queue.empty()) {
            std::vector<Node*>::iterator u = findNodeWithTheLeastDistance(queue);
            int n = (*u)->getId();
            //std::cout << "**" << n << std::endl;
            queue.erase(u);

            getNode(n)->updatesCost(this);
        }
    }
    void print() {
        for (std::vector<Node*>::iterator itr=nodes.begin(); itr != nodes.end(); ++itr) {
            (*itr)->print();
        }
    }
    Node* getNode(int n) {
        return nodes[n];
    }
private:
    std::vector<Node*> nodes;
};

void Node::updatesCost(Nodes* nodes) {
    for (std::vector<int>::iterator itr = edgesTo.begin(), itr2 = edgesCost.begin();  itr != edgesTo.end(); ++itr, ++itr2) {
    Node* v = nodes->getNode(*itr);
    int alt = cost + *itr2;
    if (alt < v->getCost()) {
        v->setCost(alt);
    }
    //nodes->print();
}
    /*
for (i=0; i<nodes[u]->sizeOfEdges; ++i) {
    int v = nodes[u]->edgesTo[i];
    int alt = nodes[u]->cost + nodes[u]->edgesCost[i];
    if (alt < nodes[v]->cost) {
        nodes[v]->cost = alt;
    }
}
*/
}

int main(int argc, char *argv[])
{
    Nodes nodes;

    nodes.readFromIn();
    nodes.dijkstrasAlgorithm();
    nodes.print();
    return 0;
}

C++: //さっさと済ませられるところはさっさと済ましてしまう．ただし注意深く
#include <cstdio>
#include <iostream>
#define MAX_VERTEXES 100
#define NIL -1
#define INFTY 20000000// >100*100000

using namespace std;

//think easy make easy

int n;//num of vertexes(頂点)
int matrix_graph[MAX_VERTEXES+1][MAX_VERTEXES+1];//0オリジン
bool vertex_set[MAX_VERTEXES+1];///0オリジン
int current_mincost[MAX_VERTEXES+1];//現時点での各頂点への最小コスト
bool candidate[MAX_VERTEXES+1];//次にvertex_setに加える頂点の候補

void findNextVertex(){
	int min_tmp=INFTY;
	int next_tmp = NIL;
	for(int i=0;i<n;i++){
		candidate[i] = false;
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			if(vertex_set[i] == true && vertex_set[j] == false){
				if(matrix_graph[i][j]+current_mincost[i] < current_mincost[j]
				   && matrix_graph[i][j] != NIL){
					   current_mincost[j]  = matrix_graph[i][j]+current_mincost[i];
					   candidate[j] = true;
				}
			}
		}
	}
	for(int i=0;i<n;i++){
		if(candidate[i] == true && current_mincost[i] < min_tmp){
			min_tmp = current_mincost[i];
			next_tmp = i;
		}
	}
	vertex_set[next_tmp] = true;
}

int main(){
	scanf("%d",&n);

	int v_num;
	int k;//v_numの出次数

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

	for(int i=0;i<n;i++){
		scanf("%d",&v_num);
		scanf("%d",&k);

		for(int j=0;j<k;j++){
			int v_num2;
			int cst;
			scanf("%d",&v_num2);
			scanf("%d",&cst);
			matrix_graph[v_num][v_num2] = cst;
		}
	}

	for(int i=0;i<n;i++){
		vertex_set[i] = false;
		current_mincost[i] = INFTY;
	}
	/*確認用
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			if(j<n-1) printf("%d ",matrix_graph[i][j]);
			else printf("%d\n",matrix_graph[i][j]);
		}
	}
	*/

	vertex_set[0] = true;
	current_mincost[0] = 0;
	for(int i=1;i<n;i++){
		findNextVertex();
	}
	for(int i=0;i<n;i++){
		cout <<i <<" " <<current_mincost[i] <<endl;
	}


	return 0;
}