Go: package main

import (
	"fmt"
	"bufio"
	"os"
	"strconv"
	"container/heap"
)

type Node struct {
	Id int
	Dis int
}

type PriorityQueue []*Node

func (pq PriorityQueue) Len() int { return len(pq) }

func (pq PriorityQueue) Less(i, j int) bool {
	return pq[i].Dis < pq[j].Dis
}

func (pq PriorityQueue) Swap(i, j int) {
	pq[i], pq[j] = pq[j], pq[i]
}

func (pq *PriorityQueue) Push(x interface{}) {
	*pq = append(*pq, x.(*Node))
}

func (pq *PriorityQueue) Pop() interface{} {
	n := len(*pq)
	pop := (*pq)[n-1]
	*pq = (*pq)[0:n-1]
	return pop
}

func main() {
	var n int
	fmt.Scan(&n)

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

	g := make([][]int, n)
	c := make([][]int, n)
	pq := make(PriorityQueue, 0, n)
	d := make([]int, n)
	for i := 0; i < n; i++ {
		sc.Scan()
		u, _ := strconv.Atoi(sc.Text())
		sc.Scan()
		k, _ := strconv.Atoi(sc.Text())
		g[u] = make([]int, k)
		c[u] = make([]int, k)
		for j := 0; j < k; j++ {
			sc.Scan()
			g[u][j], _ = strconv.Atoi(sc.Text())
			sc.Scan()
			c[u][j], _ = strconv.Atoi(sc.Text())
		}

		if u == 0 {
			d[u] = 0
		} else {
			d[u] = 1 << 30
		}
		pq.Push(&Node{u, d[u]})
	}
	heap.Init(&pq)

	for pq.Len() > 0 {
		node := heap.Pop(&pq).(*Node)
		for i := 0; i < len(g[node.Id]); i++ {
			nextId := g[node.Id][i]
			nextDis := node.Dis + c[node.Id][i]
			if nextDis < d[nextId] {
				d[nextId] = nextDis
				heap.Push(&pq, &Node{nextId, nextDis})
			}
		}
	}

	wr := bufio.NewWriter(os.Stdout)
	for i := 0; i < n; i++ {
		wr.WriteString(strconv.Itoa(i))
		wr.WriteString(" ")
		wr.WriteString(strconv.Itoa(d[i]))
		wr.WriteString("\n")
	}
	wr.Flush()
}

C++: #include<queue>
#include<vector>
#include<utility>
#include<functional>

namespace ProconLib{
    template<class graph_t,typename cost_t,cost_t INF=cost_t(1e15)>
    std::vector<cost_t> Dijkstra(int s,const graph_t& g){
        int n=g.size();
        std::vector<cost_t> res(n,INF);
        std::vector<char> used(n,0);
        res[s]=0;
        std::priority_queue<std::pair<cost_t,int>,std::vector<std::pair<cost_t,int>>,std::greater<>> que;
        que.push(std::make_pair(cost_t(0),s));
        while(!que.empty()){
            auto p=que.top(); que.pop();
            cost_t dist=p.first;
            int v=p.second;
            if(used[v]) continue;
            used[v]=true;
            for(int i=0;i<g[v].size();i++){
                cost_t tdist=dist+g[v][i].weight;
                if(tdist<res[g[v][i].to]){
                    res[g[v][i].to]=tdist;
                    que.push(std::make_pair(tdist,g[v][i].to));
                }
            }
        }
        return res;
    }

    // using Weight=long long;
    // struct Edge{
    //     int to;
    //     Weight weight;
    // };
    // using Edges=vector<Edge>;
    // using Graph=vector<Edges>;
}
// AOJ(ALDS1_12_C)
#include<iostream>
using namespace std;
using namespace ProconLib;
using Weight=long long;
struct Edge{
    int to;
    Weight weight;
};
using Edges=vector<Edge>;
using Graph=vector<Edges>;
int main(){
    int n;
    cin>>n;
    Graph g(n);
    for(int i=0;i<n;i++){
        int u,k;
        cin>>u>>k;
        for(int j=0;j<k;j++){
            Edge e;
            cin>>e.to>>e.weight;
            g[u].push_back(e);
        }
    }
    auto d=Dijkstra<Graph,Weight>(0,g);
    for(int i=0;i<n;i++){
        cout<<i<<" "<<d[i]<<endl;
    }

    return 0;
}

C++: #include <bits/stdc++.h>

using namespace std;

#define llong long long 
typedef struct data{
	vector<int> way;
	vector<int> waycost;
	int useway;
	int cost;
}data;

data d[101];

void solve(int N, int before){
	vector<int> nsolve;
	for(int i = 0; i < d[N].way.size(); i++){
		int nway = d[N].way[i];
		if(d[N].cost + d[N].waycost[i] < d[nway].cost){
			d[nway].cost = min(d[d[N].way[i]].cost, d[N].cost + d[N].waycost[i]);
			d[nway].useway = N;
			nsolve.push_back(nway);
		}
	}
	for(int i = 0; i < nsolve.size(); i++){
		solve(nsolve[i],0);
	}
}

int main(){
	int hownum;
	cin >> hownum;
	for(int i = 0; i < hownum; i++){
		int num;
		int howway;
		cin >> num >> howway;
		for(int j = 0; j < howway; j++){
			int w,c;
			cin >> w >> c;
			d[num].way.push_back(w);
			d[num].waycost.push_back(c);
		}

		if(num == 0) d[num].cost = 0;
		else d[num].cost = 10000000;
	}

	for(int i = 0; i < hownum; i++){
		solve(i, -1);
	}
	
	for(int i = 0; i < hownum; i++){
		cout << i << " " << d[i].cost << endl;
	}
	return 0;
}