Go: package main

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

type Item struct {
	value    int // The value of the item; arbitrary.
	priority int // The priority of the item in the queue.
	// The index is needed by update and is maintained by the heap.Interface methods.
	index int // The index of the item in the heap.
}
type PriorityQueue []*Item

func (pq PriorityQueue) Len() int { return len(pq) }
func (pq PriorityQueue) Less(i, j int) bool {
	return pq[i].priority < pq[j].priority
}
func (pq PriorityQueue) Swap(i, j int) {
	pq[i], pq[j] = pq[j], pq[i]
	pq[i].index = i
	pq[j].index = j
}
func (pq *PriorityQueue) Push(x interface{}) {
	n := len(*pq)
	item := x.(*Item)
	item.index = n
	*pq = append(*pq, item)
}
func (pq *PriorityQueue) Pop() interface{} {
	old := *pq
	n := len(old)
	item := old[n-1]
	item.index = -1 // for safety
	*pq = old[0 : n-1]
	return item
}

type Q struct {
	pq *PriorityQueue
	ds map[int]int // It has always same value as pq. For random access.
}

func newQ() *Q {
	pq := new(PriorityQueue)
	heap.Init(pq)
	return &Q{
		pq: pq,
		ds: make(map[int]int),
	}
}
func (q *Q) pop() (u, d int) {
	item := heap.Pop(q.pq).(*Item)
	delete(q.ds, item.value)
	return item.value, item.priority
}
func (q *Q) get(u int) (int, bool) { // returns d
	d, ok := q.ds[u]
	return d, ok
}
func (q *Q) set(u, d int) {
	q.ds[u] = d
	for _, item := range *q.pq {
		if item.value != u {
			continue
		}

		item.priority = d
		heap.Fix(q.pq, item.index)
		return
	}
	heap.Push(q.pq, &Item{
		priority: d,
		value:    u,
	})
}
func (q *Q) len() int {
	return len(q.ds)
}

func main() {
	r := bufio.NewReader(os.Stdin)

	var n int
	fmt.Fscan(r, &n)
	cs := make([]map[int]int, n) // []v_i -> c_i
	for h := 0; h < n; h++ {
		var u, k int
		fmt.Fscan(r, &u, &k)
		m := make(map[int]int)
		for i := 0; i < k; i++ {
			var v, c int
			fmt.Fscan(r, &v, &c)
			m[v] = c
		}

		cs[u] = m
	}

	q := newQ()
	q.set(0, 0)
	visited := make(map[int]struct{})
	out := make([]int, n)

	for q.len() > 0 {
		u, d := q.pop()
		for uu, c := range cs[u] {
			// Consider the connection between u and uu.
			if _, ok := visited[uu]; ok {
				continue
			}
			dd := d + c
			if d, ok := q.get(uu); !ok || d > dd {
				q.set(uu, dd)
			}
		}

		out[u] = d
		visited[u] = struct{}{}
	}

	for u, d := range out {
		fmt.Println(u, d)
	}
}

C++: #include <iostream>
#include <cstring> 
#include <algorithm> 
#include <vector> 
#define INF 2000000000 //??¨?????????????????¢????¶??????????????????????????????§????????°???????????¨????????????????????????
             
#define MAX_V 100
     using namespace std;
     int v,u,c,k,vertex;//number of vertices
     int d[MAX_V];
     int ver[100]={};
     int path[100][100]={};
     int path_exist[100][100];
     int min_index;
     bool used[MAX_V];
     int num_used=0,l;
     vector<int> q;
     void dijkstra(int s)
     {
             fill(d,d+v,INF);
             memset(used,false,sizeof(used));//(s,val,end)?????¢?????§s??????end?????§?????¢???????¢???????false??§?????????
             d[s]=0;
             while(q.size()-num_used != 0){
             		while(used[l]==true){
             			l++;
             		}
             		min_index=l;
                     for(int j=0;j<q.size();j++){
                     	if(!used[j]){//???????????¢????????????????¨??????????????????????????????¶
                     		if(d[min_index] > d[j]/*??´??????*/)
                     		min_index=q.at(j);
                     	}
                     }
                        used[min_index]=true;
                        num_used+=1;
                        for(int j=0;j<ver[min_index];j++){//min_index????????°????????????????????????edge????????¨??????????????????????????°
			  d[path_exist[min_index][j]]=min(d[path_exist[min_index][j]], d[min_index] + path[min_index][path_exist[min_index][j]]);/*??´??????*/
                        } 
            }
            return;
    }
    int main(){
        cin>>v;

        for(int i=0; i<v;i++){
        	cin>>u;
        	cin>>k;
        	ver[u]=k;
        	q.push_back(i);
        	for(int j=0;j< k ; j++){
        		cin>>vertex;
        		cin>>c;
        		path[u][vertex]= c;
        		path_exist[u][j]=vertex;

        	}
        }

        dijkstra(0);
        for(int i=0;i<v;i++){
        	cout<<i<<" "<<d[i]<<endl;
        }
        return 0;
    }