Go: package main

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

const NIL = -1

type Node struct {
	id     int
	weight int
}

func init() {
	sc.Split(bufio.ScanWords)
}

type NodeHeap []Node

func (h NodeHeap) Len() int           { return len(h) }
func (h NodeHeap) Less(i, j int) bool { return h[i].weight < h[j].weight }
func (h NodeHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }

func (h *NodeHeap) Push(x interface{}) {
	*h = append(*h, x.(Node))
}

func (h *NodeHeap) Pop() interface{} {
	old := *h
	n := len(old)
	x := old[n-1]
	*h = old[0 : n-1]
	return x
}

var sc = bufio.NewScanner(os.Stdin)

func scanInt() int {
	num, _ := strconv.Atoi(scanString())
	return num
}

func scanString() string {
	sc.Scan()
	return sc.Text()
}

func init() {
	sc.Split(bufio.ScanWords)
}

func main() {
	n := scanInt()

	route := make([][]Node, n)
	weight := make([]int, n)
	for i := 0; i < n; i++ {
		weight[i] = NIL
	}

	for i := 0; i < n; i++ {
		u := scanInt()
		k := scanInt()
		route[i] = make([]Node, k)
		for j := 0; j < k; j++ {
			route[u][j] = Node{id: scanInt(), weight: scanInt()}
		}
	}

	start := Node{id: 0, weight: 0}
	h := &NodeHeap{start}
	heap.Init(h)

	for h.Len() > 0 {
		node := heap.Pop(h).(Node)
		if weight[node.id] != NIL {
			continue
		}
		weight[node.id] = node.weight

		for _, nextNode := range route[node.id] {
			if weight[nextNode.id] != NIL {
				continue
			}
			nextNode.weight += node.weight
			heap.Push(h, nextNode)
		}
	}

	for i, w := range weight {
		fmt.Println(i, w)
	}
}

C++: #include<iostream>
#include<cstdio>
using namespace std;
static const int INFTY=(1<<21);
static const int WHITE=0;
static const int GRAY=1;
static const int BLACK=2;
int n,H[100][100];
void dd()
{
    int minv;
    int d[100],c[100];
    for(int i=0;i<n;i++)
    d[i]=INFTY;
    d[0]=0;
    while(1)
    {
        minv=INFTY;
        int u=-1;
        for(int i=0;i<n;i++)
        {
            if(minv>d[i]&&c[i]!=BLACK)
            {
                u=i;
                minv=d[i];
            }
        }
        if(u==-1) break;
        c[u]=BLACK;
        for(int v=0;v<n;v++)
        {
            if(c[v]!=BLACK&&H[u][v]!=INFTY)
            {
                if(d[v]>d[u]+H[u][v])
                {
                    d[v]=d[u]+H[u][v];
                    c[v]=GRAY;
                }
            }
        }
    }
    for(int i=0;i<n;i++)
            printf("%d %d\n",i,(d[i]==INFTY?-1:d[i]));
}
int main()
{
    int a,b,c,d;
    scanf("%d",&n);
    for(int i=0;i<n;i++)
    for(int j=0;j<n;j++)
        H[i][j]=INFTY;
    for(int i=0;i<n;i++)
    {
        scanf("%d %d",&a,&b);
        for(int j=0;j<b;j++)
        {
            scanf("%d %d",&c,&d);
            H[a][c]=d;
        }
    }
    dd();
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
static const int MAX=10000;
static const int INFTY=2000000000;

vector<pair<int,int> > A[MAX];
int dk[MAX],H[MAX+1],tail,where[MAX];

void cminHeap(int i){
    int left,right,least;
    left=2*i;right=left+1;least=i;
    if(left<=tail&&dk[H[left]]<dk[H[i]])least=left;
    if(right<=tail&&dk[H[right]]<dk[H[least]])least=right;
    if(i==least)return;
    swap(H[i],H[least]);swap(where[H[i]],where[H[least]]);
    cminHeap(least);
}

void pminHeap(int i){
    int parent=i/2;
    if(parent==0||dk[H[parent]]<=dk[H[i]])return;
    swap(H[parent],H[i]);swap(where[H[parent]],where[H[i]]);
    pminHeap(parent);
}

void heap_update(int u){
    int x=H[u];
    cminHeap(u);
    if(H[u]==x)pminHeap(u);
}

void SSSP(int n){
    for(int i=0;i<n;i++){
        dk[i]=INFTY;
        H[i+1]=i;
        where[i]=i+1;
    }
    dk[0]=0;
    tail=n;
    int v;
    while(tail>0){
        v=H[1];H[1]=H[tail];where[H[tail]]=1;
        tail--;where[v]=-1;
        cminHeap(1);
        vector<pair<int,int> >::iterator it;
        for(it=A[v].begin();it<A[v].end();it++){
            pair<int,int> item=*it;
            if(where[item.first]!=-1){
                if(dk[item.first]>dk[v]+item.second){
                    dk[item.first]=dk[v]+item.second;
                    heap_update(where[item.first]);
                }
            }
        }
    }
}

int main(){
    int n,v,k,u,d;
    cin>>n;
    for(int i=0;i<n;i++){
        scanf("%d %d",&v,&k);
        for(int j=0;j<k;j++){
            scanf("%d %d",&u,&d);
            A[v].push_back(make_pair(u,d));
        }
    }
    SSSP(n);
    for(int i=0;i<n;i++)printf("%d %d\n",i,dk[i]);
}

C++: #include<iostream>
#include<vector>
#include<queue>
using namespace std;
struct Edge {
    int d, i, j;
    Edge(int d_, int i_, int j_) : d(d_), i(i_), j(j_) {}
    bool operator< (const Edge& right) const{
        return d > right.d;
    }
};
void calc(int t, vector<vector<int> >& G, vector<int>& distance){
    int new_black = t;
    priority_queue<Edge> temp;
    for (int i = 1; i < G.size(); i++) {
        for (int j = 0; j < G.size(); j++) {
            if (distance[j] != -1) continue;
            int dis = G[new_black][j] + distance[new_black];
            temp.push(Edge(dis, new_black, j));
        }
        while (distance[temp.top().j] != -1) temp.pop();
        distance[temp.top().j] = temp.top().d;
        new_black = temp.top().j;
        temp.pop();
    }
}

int main(){
    int n;
    cin >> n;
    vector<vector<int> > G(n, vector<int>(n, 1e8));
    for (int i = 0; i < n; i++) {
        int u, k;
        cin >> u >> k;
        for (int j = 0; j < k; j++) {
            int c, v;
            cin >> c >> v;
            G[u][c] = v;
        }
    }

    vector<int> distance(n, -1);
    distance[0] = 0;
    calc(0, G, distance);
    for (int i = 0; i < n; i++) {
        cout << i << " " << distance[i] << endl;
    }
    return 0;
}