Go: package main

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

//make priority queue
type Item struct {
	id       int
	priority int // this state is priority and distans from start
	index    int
}

type PriorityQueue []*Item

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

// we want the ascending-priority-queue.
// So we use less than here.
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 = j
	pq[j].index = i
}

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
}

func (pq *PriorityQueue) update(dist int, id int) {
	for _, i := range *pq {
		if i.id == id {
			if i.priority > dist {
				i.priority = dist
			}
		}
	}
}

// the main code
func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	n, _ := strconv.Atoi(sc.Text())
	return n
}

func dikstra(dist *[][]int, n int) *[]int {
	// preparate priority queue
	inf := 1 << 30
	pq := make(PriorityQueue, n)
	shortests := make([]int, n)
	for i := 0; i < n; i++ {
		pq[i] = &Item{
			id:       i,
			priority: inf,
			index:    i,
		}

		shortests[i] = inf
	}
	pq[0].priority = 0
	shortests[0] = 0
	heap.Init(&pq)

	for pq.Len() > 0 {
		item := heap.Pop(&pq).(*Item)
		shortests[item.id] = item.priority
		for id, d := range (*dist)[item.id] {
			if d != -1 {
				pq.update(item.priority+d, id)
			}
		}
		heap.Init(&pq)
	}
	return &shortests
}

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

	// init
	n := nextInt(sc)
	dist := make([][]int, n)
	for i := 0; i < n; i++ {
		dist[i] = make([]int, n)
		for j := 0; j < n; j++ {
			dist[i][j] = -1
		}
	}

	// std Input
	for i := 0; i < n; i++ {
		u := nextInt(sc)
		k := nextInt(sc)
		for j := 0; j < k; j++ {
			v, c := nextInt(sc), nextInt(sc)
			dist[u][v] = c
		}
	}

	shortests := dikstra(&dist, n)
	for i, d := range *shortests {
		fmt.Printf("%d %d\n", i, d)
	}
}

C++: #include <iostream>
#include <queue>
#include <vector>
#define INF 1<<30
#define WHITE 0
#define BLACK 1
using namespace std;

int main(int argc, char* argv[]) {
    int n, u, k, v, c;
    cin >> n;

    int color[n];
    int d[n];
    vector <pair<int, int>> Adj[n];
    priority_queue <pair<int, int>> que;
    pair<int, int> top;

    for (int i = 0; i < n; i++){
        cin >> u >> k;
        for (int j = 0; j < k; j++){
            cin >> v >> c;
            Adj[u].push_back(make_pair(v, c));
        }
        d[i] = INF;
        color[i] = WHITE;
    }

    d[0] = 0;
    que.push(make_pair(0, 0));

    while (!que.empty()){
        top = que.top();
        que.pop();
        c = (-1)*top.first;
        u = top.second;

        color[u] = BLACK;
        for (int j = 0; j < Adj[u].size(); j++){
            int v = Adj[u][j].first;
            int w = Adj[u][j].second;

            if (color[v]) continue;
            if (d[u] + w < d[v]){
                d[v] = d[u] + w;
                que.push(make_pair((-1)*d[v], v));
            }
        }
    }
    for (int i = 0; i < n; i++)
        cout << i << " " << (d[i] == INF? -1: d[i]) << endl;

    return 0;
}

C++: #include<iostream>
using namespace std;

static const int MAX = 100000;
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];

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

    d[0] = 0;
    color[0] = GRAY;

    while(1) {
        minv = INFTY;
        int u = -1;
        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;
        for (int v = 0; v < n; v++) {
            if (d[v] > d[u] +M[u][v]) {
                d[v] = d[u] + M[u][v];
                color[v] = GRAY;
            }
        }
    }
    for (int i = 0; i < n; i++) {
        cout << i << " " << ( d[i] == INFTY ? -1 : d[i] ) << endl;
    }
}

int main(int argc, char const* argv[])
{
    cin >> n;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            M[i][j] = INFTY;
        }
    }

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

    dijkstra();
    return 0;
}

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

using namespace std;

vector<pair<int, int>> adja[10000];

#define INF (1LL << 30)

int main() {
	int n, id, k, a, b;

	cin >> n;
	for (int i = 0; i < n; ++i) {
		cin >> id >> k;
		for (int j = 0; j < k; ++j) {
			cin >> a >> b;
			adja[id].push_back(make_pair(a, b));
		}
	}

	priority_queue<pair<int, int>> que;
	que.push(make_pair(0, 0)); //cost, node
	long long cost[10000];
	fill(cost, cost + n, INF);
	cost[0] = 0;

	while (!que.empty()) {
		for (int i = 0, size = que.size(); i < size; ++i) {
			pair<int, int> top = que.top();
			que.pop();

			for (int j = 0, len = adja[top.second].size(); j < len; ++j) {
				if (cost[adja[top.second][j].first] > top.first + adja[top.second][j].second) {
					cost[adja[top.second][j].first] = top.first + adja[top.second][j].second;
					que.push(make_pair(top.first + adja[top.second][j].second, adja[top.second][j].first));
				}
			}
		}
	}

	for (int i = 0; i < n; ++i) {
		cout << i << " " << cost[i] << endl;
	}

	return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<cstring>
#include<queue>
#include<vector>
using namespace std;
const int maxn=10010;
const int Max=10000001;
int n;
int dis[maxn];
bool vis[maxn];

struct edge
{
	int u,v,w;
	edge(int u=0,int v=0,int w=Max):u(u),v(v),w(w){}
};
vector<edge> G[maxn];

struct node
{
	int d,id;
	bool operator < (const node& rhs) const
	{
		return d>rhs.d;
	}
	node(int d=0,int id=0):d(d),id(id){}
};
priority_queue<node> Q;

void dijkstra(int s)
{
	memset(dis,0x7f,sizeof(dis));
	memset(vis,0,sizeof(vis));
	dis[s]=0;
	Q.push(node(0,s));
	while(!Q.empty())
	{
		node u=Q.top();
		Q.pop();
		if(vis[u.id]) continue;
		vis[u.id]=1;
		for(unsigned int i=0;i<G[u.id].size();++i)
		{
			edge e=G[u.id][i];
			if(dis[e.v]>dis[u.id]+e.w)
			{
				dis[e.v]=dis[u.id]+e.w;
				Q.push(node(dis[e.v],e.v));
			}
		}
	}
}

void print()
{
	for(int i=0;i<n;++i)
	  printf("%d %d\n",i,dis[i]);
	return;
}

int main()
{
	scanf("%d",&n);
	for(int i=0;i<n;++i)
	{
		int id,k;
		scanf("%d%d",&id,&k);
		for(int j=0;j<k;j++)
		{
			int v,w;
			scanf("%d%d",&v,&w);
			G[id].push_back(edge(id,v,w));
		}
	}
	dijkstra(0);
	print();
	return 0;
}