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 <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> P;
map <int,int> mp;
vector<int> V;
#define INF (1<<30)
#define INFLL (1ll<<60)
#define EPS (1e-10)
static const int MAX=1e5;
static const int MOD=1e9+7;
static const int NMAX=50;
static const int MMAX=50;
int dx[4]={0,1,0,-1},dy[4]={-1,0,1,0};
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;

int N;
int d[MAX];
vector<P> adj[MAX]; //<隣接地点,その地点の最短距離>
void dijkstra(int s){
    priority_queue<P> PQ; //<最短距離*-1,場所>
    int color[MAX];
    for(int i=0;i<N;i++){
        d[i]=INF;
        color[i]=WHITE;
    }
    
    d[s]=0;
    PQ.push(make_pair(0,0));
    color[0]=GRAY;
    
    while(!PQ.empty()){
        P f=PQ.top(); PQ.pop();
        int u=f.second; //次に行く場所の候補
        
        color[u]=BLACK;
        
        if(d[u]<f.first*(-1)) continue; //候補の今の時点の最短距離が、記録されてるのより小さい
        
        for(int j=0;j<adj[u].size();j++){
            int v=adj[u][j].first; //uのj番目の隣接地点のインデックス
            if(color[v]==BLACK) continue; //もう行った
            if(d[v]<=d[u]+adj[u][j].second)continue;//vにはもっと早い行き方がある
            d[v]=d[u]+adj[u][j].second;
            PQ.push(make_pair(d[v]*(-1),v));
            color[v]=GRAY;
        }
        
    }
}


int main(){
    cin.tie(0);  ios::sync_with_stdio(false);
    
    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(0);
    for(int i=0;i<N;i++)
        cout<<i<<" "<<(d[i]==INF?-1:d[i])<<"\n";
    
    return 0;
}

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

using weight = int;

struct edge {
    int to;
    weight cost;
};

using edges = std::vector<edge>;
using graph = std::vector<edges>;

// when g has neg cycle, second -> false
std::pair<std::vector<weight>, bool> spfa(graph const& g, int s) {
    constexpr weight inf = std::numeric_limits<weight>::max() / 2;
    const int n = g.size();
    std::vector<weight> d(n, inf);
    std::vector<int> in_q(n), count(n);
    std::queue<int> que;
    d[s] = 0;
    que.emplace(s);
    in_q[s] = true;
    ++count[s];
    bool neg_cycle = false;
    [&]() {
        while(!que.empty()) {
            int v = que.front();
            que.pop();
            in_q[v] = false;
            for(auto& e : g[v]) {
                if(d[v] != inf && d[e.to] > d[v] + e.cost) {
                    d[e.to] = d[v] + e.cost;
                    if(!in_q[e.to]) {
                        que.emplace(e.to);
                        in_q[e.to] = true;
                        ++count[e.to];
                        if(count[e.to] >= n) {
                            neg_cycle = true;
                            return;
                        }
                    }
                }
            }
        }
    }();

    return std::make_pair(d, !neg_cycle);
}

using namespace std;

int main() {
    int n;
    cin >> n;
    graph g(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(edge{v, c});
        }
    }

    auto ans = spfa(g, 0).first;
    for(int i = 0; i < n; ++i) {
        cout << i << ' ' << ans[i] << endl;
    }
}

C++: #include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <queue>
using namespace std;
const int maxx=10010;
const int infinity=1<<30;

int main() {
	int n,a,b,c,e;
	vector<pair<int, int> > A[maxx];
	bool flag[maxx];
	int d[maxx];
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a>>b;
		for(int j=0;j<b;j++){
			cin>>c>>e;
			A[a].push_back(make_pair(c,e));
		}
	}
	for(int i=0;i<n;i++){
		flag[i]=false;
		d[i]=infinity;
	}
	priority_queue<pair<int,int> > PQ;
	d[0]=0;
	PQ.push(make_pair(0, 0));
	while(PQ.empty()==0){
		pair<int, int> u=PQ.top();
		PQ.pop();
		//cout<<u.first<<" "<<d[u.first]<<endl;
		flag[u.second]=true;
		int len=A[u.second].size();
		for(int i=0;i<len;i++){
			int v=A[u.second][i].first;
			if(flag[v]==false && d[u.second]+A[u.second][i].second<d[v]){
				d[v]=d[u.second]+A[u.second][i].second;
				PQ.push(make_pair(d[v]*(-1),v));
			}
		}
	}

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

	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n) ; i++)
constexpr auto INF = 2147483647;
typedef long long ll;

static const int MAX = 10000;
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;

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

void dijkstra(){
  priority_queue<pair<int,int>> pq;
  int color[MAX], d[MAX];
  rep(i,n){
    color[i] = WHITE;
    d[i] = INF;
  }
  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_vec[u].size(); j++){
      int v = Adj_vec[u][j].first;
      if(color[v] == BLACK) continue;
      if(d[v] > d[u] + Adj_vec[u][j].second){
        d[v] = d[u] + Adj_vec[u][j].second;
        pq.push(make_pair(d[v] * -1, v));
        color[v] = GRAY;
      }
    }
  }
  rep(i,n){
    cout << i << " " << (d[i] == INF ? -1 : d[i]) << endl;
  }
}

int main(){
  int k, c, u, v;
  cin >> n;
  rep(i,n){
    cin >> u >> k;
    rep(j,k){
      cin >> v >> c;
      Adj_vec[u].push_back(make_pair(v, c));
    }
  }

  dijkstra();

  return 0;
}