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<algorithm>
#include<queue>
using namespace std;
const int MAX = 10000;
const int INFTY = (1 << 20);
const int WHITE = 0;
const int GRAY = 1;
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;
				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]) << 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();
}

C++: //Single Source Shortest Path II
#include <iostream>
#include <vector>
#include <queue>
#include <climits>

using namespace std;

static const int N = 10000;
static const int WHITE = 0;
static const int BLACK = 1;
int n, colors[N], d[N];
vector<pair<int, int> > G[N];


void dijkstra() {
    priority_queue<pair<int, int>, vector<pair<int, int> >, greater<pair<int, int> > > PQ;
    for(int i = 0; i < N; i++) {
        colors[i] = WHITE;
        d[i] = INT_MAX;
    }
    d[0] = 0;
    PQ.push(make_pair(0, 0));
    while(!PQ.empty()) {
        pair<int, int> f = PQ.top();
        PQ.pop();
        int u = f.second;
        if(colors[u] == BLACK) continue;
        for(int i = 0; i < G[u].size(); i++) {
            if(d[G[u][i].first] > f.first + G[u][i].second) {
                d[G[u][i].first] = f.first + G[u][i].second;
                PQ.push(make_pair(d[G[u][i].first], G[u][i].first));
            }

        }
    }
}

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

    dijkstra();

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

C++: #include<iostream>
#include<vector>
#include<stack>

#define INF (1 << 21)

int main() {
	int node_num;

	std::cin >> node_num;
	std::vector<std::vector<int> > node(node_num, std::vector<int>(node_num, -1));

	for (size_t i = 0; i < node.size(); i++) {
		int out, node_number;
		std::cin >> node_number >> out;
		for (int j = 0; j < out; j++) {
			int to, distance;
			std::cin >> to >> distance;
			node[node_number][to] = distance;
		}
	}

	std::vector<int> distance(node.size(), INF);
	std::stack<int> s;
	distance[0] = 0;

	s.push(0);
	while(!s.empty()) {
		int node_number = s.top(); s.pop();
		for (size_t j = 0; j < node[node_number].size(); j++) {
			if (node[node_number][j] != -1 && node[node_number][j] + distance[node_number] < distance[j]) {
				distance[j] = node[node_number][j] + distance[node_number];
				s.push(j);
			}
		}
	}

	for (size_t i = 0; i < distance.size(); i++) {
		std::cout << i << " " << distance[i] << std::endl;
	}
}

C++: #include<bits/stdc++.h>
using namespace std;

#define fi first
#define se second

vector<pair<int,int> >adj[10010];
priority_queue<pair<int,int> > pq;
int nodes[10010];

int main(){
	memset(nodes,-1,sizeof(nodes));
	int n,node,k,v,c;
	cin>>n;
	for (int i=0; i<n; ++i) {
		cin>>node>>k;
		for (int j=0; j<k; ++j) {
			cin>>v>>c;
			adj[node].push_back(make_pair(v,c));
		}
	}
	pq.push(make_pair(0,0));
	while(!pq.empty()){
		pair<int,int> cur=pq.top();
		pq.pop();
		if(nodes[cur.se]!=-1){//kalo udh didatengin
			continue;
		}
		else nodes[cur.se]=-cur.fi;
		for(int i=0;i<adj[cur.se].size();i++){
			pq.push(make_pair(-adj[cur.se][i].se+cur.fi,adj[cur.se][i].fi));
		}
	}
	for (int i=0; i<n; ++i) {
		cout<<i<<" "<<nodes[i]<<endl;
	}
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;

const int MAX = 10010;
const int INF = INT_MAX;

int n;
int dist[MAX];
typedef pair<int, int> VC;
typedef pair<int, int> VD;
vector< vector<VC> > G;

void dijkstra(int s)
{
  priority_queue<VD, vector<VD>, function<bool(VD, VD)>> que(
    [](VD a, VD b) { return a.second >= b.second; }
  );

  dist[s] = 0;
  que.push(make_pair(s, dist[s]));
  while (!que.empty()) {
    VD vd= que.top(); que.pop();
    int u = vd.first, d = vd.second;
    for (int i = 0; i < G[u].size(); i++) {
      int v = G[u][i].first, c = G[u][i].second;
      if (dist[v] > d + c) {
        dist[v] = d + c;
        que.push(make_pair(v, dist[v]));
      }
    }
  }
}

int main()
{
  cin >> n;

  fill(dist, dist+n, INF);
  G = vector< vector<VC> >(n);

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

  dijkstra(0);

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

  return EXIT_SUCCESS;
}