Go: package main

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

var sc = bufio.NewScanner(os.Stdin)

const T = 10000000

var n int
var A [101][101]int

func nextInt() int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return i
}
func Shortestsearch() {
	var Minimum int
	var d, color [100]int
	var u int

	for i := 0; i < n; i++ {
		d[i] = T
		color[i] = 0
	}

	d[0] = 0
	color[0] = 1

	for {
		Minimum = T
		u = -1
		for i := 0; i < n; i++ {
			if Minimum > d[i] && color[i] != 2 {
				u = i
				Minimum = d[i]
			}
		}
		if u == -1 {
			break
		}
		color[u] = 2
		for j := 0; j < n; j++ {
			if color[j] != 2 && A[u][j] != T {
				if d[j] > d[u]+A[u][j] {
					d[j] = d[u] + A[u][j]
					color[j] = 1
				}
			}
		}
	}
	for i := 0; i < n; i++ {
		fmt.Printf("%d %d\n", i, d[i])
	}
}
func main() {
	sc.Split(bufio.ScanWords)
	n = nextInt()

	for i := 0; i < n; i++ {
		for j := 0; j < n; j++ {
			A[i][j] = T
		}
	}
	for i := 0; i < n; i++ {
		u := nextInt()
		k := nextInt()
		for j := 0; j < k; j++ {
			v := nextInt()
			c := nextInt()
			A[u][v] = c
		}
	}
	Shortestsearch()
}

C++: #include<bits/stdc++.h>
using namespace std;
static const int INFTY = (1 << 21);
static const int BLACK = 1;
static const int Maxn = 110;

int n, M[Maxn][Maxn], p[Maxn], d[Maxn], color[Maxn];
void dijkstra(){
	for(int i = 0; i < n; i++){
		d[i] = INFTY;
		p[i] = -1;
	}
	d[0] = 0;
	while(1){
		int minv = INFTY, u = -1;
		for(int i = 0; i < n; i++){
			if(d[i] < minv && color[i] != BLACK){
				minv = d[i];
				u = i;
			}
		}
		if(u == -1) break;
		color[u] = BLACK;
		for(int v = 0; v < n; v++){
			if(color[v] != BLACK && M[u][v] + d[u] < d[v]){
				d[v] = M[u][v] + d[u];
				p[v] = u;
			}
		}
	}
	for(int i = 0; i < n; i++) cout << i << " " << d[i] << endl;
}
int main()
{
	memset(M, -1, sizeof(M));
	int u, k, t, c;
	cin >> n;
	for(int i = 0; i < n; i++){
		cin >> u >> k;
		while(k--){
			cin >> t >> c;
			M[u][t] = c;
		}
		for(int j = 0; j < n; j++) 
			if(M[u][j] == -1)  M[i][j] = INFTY;
	}	
	/*for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++) cout << M[i][j] << " ";
		cout << "\n";
	}*/
	dijkstra();
	return 0;
}

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

const int MAX = 110;
const int INF = INT_MAX;

int edge[MAX][MAX];
int dist[MAX];

void dijkstra(int s, int n)
{
  queue<int> que;

  dist[s] = 0;
  que.push(s);
  while (!que.empty()) {
    int u = que.front(); que.pop();
    for (int v = 0; v < n; v++) {
      if (edge[u][v] != -1 && (dist[v] == INF || dist[v] > dist[u] + edge[u][v])) {
        dist[v] = dist[u] + edge[u][v];
        que.push(v);
      }
    }
  }
}

int main()
{
  int n; cin >> n;

  memset(edge, -1, sizeof(edge));
  fill(dist, dist+n, INF);

  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;
      edge[u][v] = c;
    }
  }

  dijkstra(0, n);

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

  return EXIT_SUCCESS;
}

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

#define MAX_VERTEX 100
#define INF 1000000

int vertex_num; // ???????????°
int d[MAX_VERTEX][MAX_VERTEX];  // ???????????¢???d[?§????][??????]??§?§??????????????????????????????¢?????¨???

void Input() {
  cin >> vertex_num;

  // (a1) ??\???????????¶??§?????????
  // d?????¨???INF?????????????§??????¨????????????????????´???0
  for (int i = 0; i < vertex_num; i++) {
    for (int j = 0; j < vertex_num; j++) {
      d[i][j] = i == j ? 0 : INF;
    }
  }

  for (int i = 0; i < vertex_num; i++) {
    int vertex, out;
    cin >> vertex >> out;
    for(int j = 0; j < out; j++) {
      int to, c;
      cin >> to >> c;
      d[vertex][to] = c;
    }
  }
}

void WarshallFloyd() {
  for (int k = 0; k < vertex_num; k++) {
    for (int i = 0; i < vertex_num; i++) {
      for (int j = 0; j < vertex_num; j++) {
        d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
      }
    }
  }
}

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

int main() {

  Input();
  WarshallFloyd();
  Output();

  return 0;
}

C++: #include<iostream>
using namespace std;
static const int MAX=100;
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 func(){
  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(color[v]!=BLACK&&M[u][v]!=INFTY){
	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(){
  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;
    }
  }
  func();
  return 0;
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
using namespace std;

struct Node
{
    vector<int> cost;
    vector<int> vertex;

    bool visited = false;
    int minCost = 100000000;
};

int N;
vector<Node> firstNodes(100);

int findNode(const vector<Node>& nodes)
{
    int minCost = 1000000000;
    int index = -1;
    for (int i = 0; i < nodes.size(); i++)
    {
        if(minCost > nodes[i].minCost && !nodes[i].visited)
        {
            minCost = nodes[i].minCost;
            index = i;
        }   
    }
    return index;
}

int main()
{
    cin >> N;
    int u;
    int k;
    int temp;
    for(int i = 0;i < N;i++)
    {
        cin >> u;
        cin >> k;
        for(int i = 0;i < k;i++)
        {
            cin >> temp;
            firstNodes[u].vertex.push_back(temp);
            cin >> temp;
            firstNodes[u].cost.push_back(temp);
        }
    }

    firstNodes[0].minCost = 0;
    
    for(int vi = 0;vi < N;vi++)
    {
        vector<Node> nodes = firstNodes;
        while(nodes[vi].visited != true)
        {
            //find a node that is visited and has minimum cost
            int index = findNode(nodes);

            Node& minNode = nodes[index];
            int vertex;
            int cost;
            minNode.visited = true;
            for (size_t i = 0; i < minNode.vertex.size(); i++)
            {
                vertex = minNode.vertex[i];
                cost = minNode.cost[i];
                nodes[vertex].minCost = min(nodes[vertex].minCost,minNode.minCost + cost);
            }
        }
        cout << vi << " " << nodes[vi].minCost << endl;
    }
}