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

	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 <vector>
#include <queue>
#define INF 1e9
using namespace std;

int main(){
    //declaration and input
    int n;
    cin >> n;
    int u, k;
    vector<vector<pair<int, int>>> graph(n);
    for (int i = 0; i < n; i++){
        cin >> u >> k;
        int v, c;
        for (int j = 0; j < k; j++){
            cin >> v >> c;
            graph[u].push_back(make_pair(c, v));
        }
    }
    vector<int> cost(n, INF);
    vector<bool> is_visit(n, false);
    vector<int> parent_of(n, -1);

    //dijkstra
    //init
    cost[0] = 0;
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> que;
    que.push(make_pair(0, 0));

    //loop
    while (!que.empty()){
        pair<int, int> p = que.top();
        que.pop();
        int c = p.first; //cost
        int v = p.second; //vertax
        is_visit[v] = true;
        if (c > cost[v])
            continue;
        for (int i = 0; i < graph[v].size(); i++){
            if (!is_visit[graph[v][i].second]){
                if (cost[v] + graph[v][i].first < cost[graph[v][i].second]){
                    cost[graph[v][i].second] = cost[v] + graph[v][i].first;
                    que.push(make_pair(cost[graph[v][i].second], graph[v][i].second));
                    parent_of[graph[v][i].second] = v;
                }
            }
        }
    }

    //output
    for (int i = 0; i < n; i++){
        cout << i << ' ' << cost[i] << endl;
    }
    return 0;
}

C++: #include<cstdio>
#include<iostream>
#include<stack>
#include<vector>
#include<algorithm>
#include<cstring>
#include<cstdlib>
#define _USE_MATH_DEFINES // M_PI????????????????????????
#include<math.h>
#include<queue>
#pragma warning(disable:4996)
using namespace std;

static const int MAX = 10000;
static const int INFTY = (1<<20);
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;

int n;
vector<pair<int,int> > adj[MAX]; // ????????????????????°???????????£??\???????????¨???

void dijkstra(){
	priority_queue<pair<int,int> > PQ;
	int color[MAX];
	int d[MAX];
	for(int i=0; i<n; i++){
		d[i] = INFTY;
		color[i] = WHITE;
	}

	d[0] = 0;
	PQ.push(make_pair(0,0));
	color[0] = GRAY;

	while( !PQ.empty() ){
		pair<int,int>f = PQ.top();
		PQ.pop();
		int u = f.second;
		color[u] = BLACK;
		// ????°???????????????????????????????????????§???????????°??????
		if( d[u]<f.first*(-1) ) continue;
		for(int j=0; j<adj[u].size(); j++){
			int v = adj[u][j].first;
			if( color[v]==BLACK ) continue;
			if( d[v]>d[u]+adj[u][j].second ){
				d[v] = d[u] + adj[u][j].second;
				// priority_queue????????????????????§??§??????????????????????????????-1????????????
				PQ.push(make_pair(d[v]*(-1),v));
				color[v] = GRAY;
			}
		}
	}
	
	for(int i=0; i<n; i++){
		cout << i << " " << ( d[i]==INFTY ? -1 : d[i] ) << "\n";
	}
}

int main(){
	int k, u, v, c;
	cin >> n;

	for(int i=0; i<n; i++){
		cin >> u >> k;
		for(int j=0; j<n; j++){
			cin >> v >> c;
			adj[u].push_back(make_pair(v,c));
		}
	}
	dijkstra();
	return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<queue>
using namespace std;
static const int MAX = 10000;
static const int INFTY = (1 << 20);
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;

int n;
vector<pair<int, int> > adj[MAX];

void dijkstra() {
	priority_queue<pair<int, int> > PQ;
	vector<int> color(MAX,WHITE);
	vector<int> d(MAX,INFTY);
	
	d[0] = 0;
	PQ.push(make_pair(0, 0));
	color[0] = GRAY;

	while (!PQ.empty()) {
		pair<int, int> f = PQ.top(); PQ.pop();
		int u = f.first;

		color[u] = BLACK;

		if (d[u] < f.second*(-1))continue;

		for (int j = 0; j < adj[u].size(); j++) {
			int v = adj[u][j].first;
			if (color[v] == BLACK)continue;
			if (d[v] > d[u] + adj[u][j].second) {
				d[v] = d[u] + adj[u][j].second;
				PQ.push(make_pair(v, d[v] * (-1)));
				color[v] = GRAY;
			}
		}
	}

	for (int i = 0; i < n; i++) {
		cout << i << " " << (d[i] == INFTY ? -1 : d[i]) << endl;
	}
}

int main() {
	int k, u, v, c;

	cin >> n;
	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));
		}
	}

	dijkstra();

	return 0;
}

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

using namespace std;
typedef pair<int, int> P;

struct edge {
    int t, c;
    edge(int t, int c): t(t), c(c) {}
};

const int INF = 1e9;
int n, u, k, v, c;
vector<edge> G[10000];
int d[10000];

void dijkstra(int s) {
    fill(d, d + n, INF);
    d[s] = 0;

    priority_queue<P, vector<P>, greater<P> > que;
    que.push(P(0, s));
    while (!que.empty()) {
        P p = que.top(); que.pop();
        int v = p.second;
        if (d[v] < p.first) continue;
        for (int i = 0; i < G[v].size(); i++) {
            edge e = G[v][i];
            if (d[e.t] <= d[v] + e.c) continue;
            d[e.t] = d[v] + e.c;
            que.push(P(d[e.t], e.t));
        }
    }
}

int main(void) {
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> u >> k;
        for (int j = 0; j < k; j++) {
            cin >> v >> c;
            G[u].push_back(edge(v, c));
        }
    }

    dijkstra(0);

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

    return 0;
}