Go: package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	r := bufio.NewReader(os.Stdin)

	var n int
	fmt.Fscan(r, &n)
	cs := make([]map[int]int, n) // []v_i -> c_i
	for h := 0; h < n; h++ {
		var u, k int
		fmt.Fscan(r, &u, &k)
		m := make(map[int]int)
		for i := 0; i < k; i++ {
			var v, c int
			fmt.Fscan(r, &v, &c)
			m[v] = c
		}

		cs[u] = m
	}

	q := make(map[int]int)
	q[0] = 0
	visited := make(map[int]struct{})
	out := make([]int, n)

	for len(q) > 0 {
		u := top(q)
		for uu, c := range cs[u] {
			// Consider the connection between u and uu.
			if _, ok := visited[uu]; ok {
				continue
			}
			if d, ok := q[uu]; !ok || d > q[u]+c {
				q[uu] = q[u] + c
			}
		}

		out[u] = q[u]
		delete(q, u)
		visited[u] = struct{}{}
	}

	for u, d := range out {
		fmt.Println(u, d)
	}
}

func top(q map[int]int) int {
	minu := -1
	min := -1
	for u, d := range q {
		if min < 0 || d < min {
			minu = u
			min = d
		}
	}

	return minu
}

C++: #include<bits/stdc++.h>
using namespace std;
vector<int> color;//0:白1:灰2:黒
vector<vector<int>> M;
vector<int> d;
vector<int> p;
typedef long long int Int;

const int INF = 10000000;
int n;
void dijkstra(int s){
    
    for(int i=0;i<n;i++){
        d[i] = INF;
    }
    d[s] = 0;
    p[s] = -1;

    while(1){
        int u=-1;
        int mincost = INF;
        for(int i=0;i<n;i++){
            if(color[i]!=2&&d[i]<mincost){
                mincost = d[i];
                u = i;
            }
        }
        if(mincost == INF) break;
        color[u] = 2;
        for(int v=0;v<n;v++){
            if(color[v]!=2&&M[u][v]!=INF){
                if(d[u]+M[u][v]<d[v]){
                    d[v] = d[u]+M[u][v];
                    p[v] = u;
                    color[v] = 1;
                }
            }
        }
    }
}

int main(){
    cin >> n;
    color.assign(n,0);//0:白1:灰2:黒
    M.assign(n,vector<int>(n,INF));
    d.resize(n);
    p.resize(n);
    for(int i=0;i<n;i++){
        int id,k;cin >> id >> k;
        for(int j=0;j<k;j++){
            int v,cost;cin >> v >> cost;
            M[id][v] = cost;
        }
    }
    dijkstra(0);
    for(int i=0;i<n;i++){
        cout << i << " ";
        cout << d[i] << endl;
    }
}

C++: #include <cstdio>
static const int INFTY = (1 << 21);
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;

int n, **M;
int *d;

void dijkstra() {
    int u, minv;
    int d[n], color[n];

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

    while (1) {
        u = -1;
        minv = INFTY;
        for (int i = 0; i < n; i++) {
            if (color[i] != BLACK && d[i] < minv) {
                u = i;
                minv = d[i];
            }
        }

        if (u == -1) { break; }

        color[u] = BLACK;
        for (int v = 0; v < n; v++) {
            if (color[v] != BLACK && M[u][v] != INFTY) {
                if (d[u] + M[u][v] < d[v]) {
                    d[v] = d[u] + M[u][v];
                    color[v] = GRAY;
                }             
            }
        }
    }
    
    for (int i = 0; i < n; i++) {
        printf("%d %d\n", i, d[i]);
    }
}

int main() {
    scanf("%d", &n);

    M = new int*[n];
    for (int i = 0; i < n; i++) {
        M[i] = new int[n];
        for (int j = 0; j < n; j++) {
            M[i][j] = INFTY;
        }
    }

    for (int i = 0; i < n; i++) {
        int u, k;
        scanf("%d %d", &u, &k);
        for (int j = 0; j < k; j++) {
            int v, c;
            scanf("%d %d", &v, &c);
            M[u][v] = c;
        }
    }

    dijkstra();

    return 0;
}

C++: #include <stdio.h>
#include <iostream>
#include <queue>
#include <list>
using namespace std;

class Node
{
private:
	list<int> next_node_list;
	list<int> next_weight_list;
public:
	Node();
	void AddNextNode(int id, int weight);
	void SetWeight(int weight);
	void DistributeWeight();
	int weight_from_0;
	bool check;
};

Node::Node()
{
	weight_from_0 = -1;
	check = false;
}

Node *Node_list;

struct GreatNode
{
	bool operator()(const Node *n1, const Node *n2) const {
		return n1->weight_from_0 > n2->weight_from_0;
	}
};
priority_queue<Node*, vector<Node*>, GreatNode > que;

void Node::AddNextNode(int id, int weight)
{
	next_node_list.push_back(id);
	next_weight_list.push_back(weight);
}

void Node::SetWeight(int weight)
{
	if (weight_from_0 == -1 || weight < weight_from_0) {
		weight_from_0 = weight;
	}
}

void Node::DistributeWeight()
{
	check = true;
	list<int>::iterator itr2 = next_weight_list.begin();
	for(list<int>::iterator itr = next_node_list.begin(); itr != next_node_list.end(); itr++){	
		if (Node_list[*itr].check == false) {
			Node_list[*itr].SetWeight(weight_from_0 + *itr2);
			que.push(&Node_list[*itr]);
		}
		itr2++;
	}
}

int main(void)
{
	//input
	int n;
	cin >> n;
	Node_list = new Node[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;
			Node_list[i].AddNextNode(v, c);
		}
	}

	//weight from 0 ?
	Node_list[0].check = true;
	Node_list[0].weight_from_0 = 0;
	Node_list[0].DistributeWeight();
	while (!que.empty()) {
		Node *node = que.top();
		que.pop();
		node->DistributeWeight();
	}

	//output
	for (int i = 0; i < n; i++) {
		cout << i << " " << Node_list[i].weight_from_0 << endl;
	}
	
	return 0;
}

C++: #include<cstdio>
#include<cstdlib>
#include<algorithm>
#include<iostream>
#include<stack>
#include<vector>
#define INFTY 500000
#define WHITE 0
#define GRAY 1
#define BLACK 2
using namespace std;

int color[120],d[120];
vector<pair<int,int> > v[120];
int n;

void start(int x){
  d[x]=0;
  while(true){
    int minimumd=INFTY,u;
    for(int i=0;i<n;i++){
      if(color[i]!=BLACK && minimumd>d[i]){
        minimumd=d[i];
        u=i;
      }
    }
    if(minimumd==INFTY) break;
    color[u]=BLACK;
    for(int i=0;i<v[u].size();i++){
      int temp=v[u][i].first;
      if(d[temp]>d[u]+v[u][i].second && color[temp]!=BLACK){
        d[temp]=d[u]+v[u][i].second;
        color[temp]=GRAY;
      }
    }
  }
  for(int i=0;i<n;i++){
    cout<<i<<" "<<d[i]<<endl;
  }
}

int main(){
  int u,k,v1,c;
  cin>>n;
  for(int i=0;i<n;i++){
    d[i]=INFTY;
  }
  for(int i=0;i<n;i++){
    cin>>u>>k;
    for(int j=0;j<k;j++){
      cin>>v1>>c;
      v[u].push_back(make_pair(v1,c)); 
    }
  }
  start(0);
}

C++: #include <bits/stdc++.h>
const int INF = 500000;
using namespace std;

int main(void){
  bool used[100];
  int n, G[100][100], p[100];
  cin >> n;
  for(int i=0; i < 100; i++){
    used[i] = false;
    for(int j=0; j < 100; j++){
      G[i][j] = INF;
    }
  }
  for(int i=0; i < n; i++){
    int vtmp, k;cin >> vtmp >> k;
    for(int j=0; j < k; j++){
      int v, c; cin >> v >> c;
      G[vtmp][v] = c;   
    }
  }

  int d[100];
  for(int i=0; i < n; i++){
    d[i] = INF;
  }
  d[0] = 0;

  while(1){
    int mind = INF;
    int minind = -1;
    for(int j=0; j < n; j++){
      if(used[j] == false && d[j] < mind){
        mind = d[j]; minind = j;
      }
    }
    if(minind == -1) break;
    used[minind] = true;
    for(int j=0; j < n; j++){
      if(used[j] == false && G[minind][j] != INF){
        if(d[minind] + G[minind][j] < d[j]){
          d[j] = d[minind] + G[minind][j];
          p[j] = minind;
        }
      }
    }
  }
  for(int i=0; i < n; i++){
    cout << i << " " << d[i] << endl;
  }

  return 0;
}