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 <iostream>
#include <cstdio>
#include <vector>
#include <queue>
#define MAX 100
#define INF (1<<30)

using namespace std;
enum state{
  BLACK,
  WHITE
};

int main(){
  vector<int> v[MAX];
  vector<int> c[MAX];
  state s[MAX];
  int d[MAX];
  int n; cin>>n;

  for(int i=0;i<n;i++){
    int u; cin>>u;
    int k; cin>>k;
    for(int j=0;j<k;j++){
      int tmp,tmp2; cin>>tmp>>tmp2;
      v[u].push_back(tmp);
      c[u].push_back(tmp2);
    }
  }

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

  vector<int> blacklist;
  blacklist.push_back(0);

  while(1){
    int& last = blacklist.back();
    for(int i = 0;i<v[last].size();i++){
      if(d[v[last][i]]>d[last]+c[last][i]){
        d[v[last][i]]=d[last]+c[last][i];
      }
    }

    int minv=-1;
    for(int b:blacklist){
      for(int i=0;i<v[b].size();i++){
        if(s[v[b][i]]!=BLACK && d[v[b][i]]<d[minv]){
          minv=v[b][i];
        }
      }
    }
    if(minv!=-1){
      s[minv]=BLACK;
      blacklist.push_back(minv);
    }else{
      break;
    }
  }

  for(int i=0;i<n;i++){
    printf("%d %d\n",i,d[i]);
  }
}

C++: #include<iostream>
#include<cstdio>
#include<climits>
using namespace std;
 
#define N 10000
int n;
 
int g[N][N];
 
int weight[N];
bool us[N];
 
//prim
void prim(){
 
  int v;
  
  weight[0]=0;
   
  while(true){
    v=-1;
    
    for(int i=0;i<n;i++){
      if(us[i]!=true && (v==-1 ||weight[i]<weight[v]))v=i;
    }
 
    if(v==-1)break;
    us[v]=true;
  
 
    for(int i=0;i<n;i++){
      if(weight[i]>(g[v][i]+weight[v])){
 
        weight[i]=(g[v][i]+weight[v]);
        //      cout <<"fsafa"<<endl;
      }
    }
  }
  
}
 
 
int main(){
 
  int u,k1,c,v;
 
  for(int i=0;i<N;i++){
    for(int j=0;j<N;j++){
      g[i][j]=9953535;
    }
  }
 
  //load n
  cin >>n;
 
  //load data
  for(int i=0;i<n;i++){
    weight[i]=INT_MAX;
    us[i]=false;
    scanf("%d %d",&u,&k1);
    for(int j=0;j<k1;j++){
      scanf("%d %d",&v,&c);
      g[u][v]=c;
      //    cout <<g[i][j]<<" ";
    }
    //    cout <<endl;
  }
 
 
 
 
  //print
  prim();
 
  for(int i=0;i<n;i++){
    cout <<i<<" "<<weight[i]<<endl;
  }
  return 0;
 
}

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

#define MAX 100
#define BLACK 0
#define GRAY 1
#define WHITE 2
#define INF (1<<30)

int graph[MAX][MAX];
int n;

// プロトタイプ宣言
void dijkstra(int start);
// ここまで

int main(){
	for(int i=0;i<MAX;i++){
		for(int j=0;j<MAX;j++){
			graph[i][j]=INF;
		}
	}

	int from,to,k,weight;		cin>>n;
	for(int i=0;i<n;i++){
		cin>>from>>k;
		for(int j=0;j<k;j++){
			cin>>to>>weight;
			graph[from][to]=weight;
		}
		
	}

	dijkstra(0);

	return 0;
}

//  - - - - - - - - - - - - - - - - - - - --
void dijkstra(int start){
	int color[MAX];
	int d[MAX];
	int p[MAX];
	for(int i=0;i<MAX;i++){
		color[i]=WHITE;
		d[i]=INF;
		p[i]=-1;
	}

	d[start]=0;
	p[start]=-1;

	while(1){
		int from = -1;
		int minCost=INF;
		for(int i=0;i<n;i++){
			if(color[i]!=BLACK && d[i]<minCost){
				minCost=d[i];
				from=i;
			}
		}
		if(from == -1)break;
		
		color[from]=BLACK;

		for(int to=0;to<n;to++){
			if(color[to]!=BLACK && graph[from][to]!=INF){
				if(d[from]+graph[from][to] < d[to]){
					d[to] =d[from]+graph[from][to];
					p[to]=from;
					color[to]=GRAY;
				}
			}
		}
	}

	for(int i=0;i<n;i++){
		printf("%d %d\n",i,d[i]);
	}
}

C++: #include<cstdio>

const static int MAX = 100;
const static int WHITE = 0;
const static int GRAY = 1;
const static int BLACK = 2;
const static int INFTY = (1<<30);

int M[MAX][MAX];
int color[MAX];
int d[MAX];
int p[MAX];
int n;

void dijkstra()
{
	//初始化
	for(int i=0; i<n; i++)
	{
		color[i] = WHITE;
		d[i] = INFTY;
	}
	int u;
	int mincost;
	d[0] = 0;
	p[0] = -1;

	while(1)
	{
		//选出d[u]最小的点
		mincost = INFTY;
		for(int i=0; i<n; i++)
		{
			if(color[i] != BLACK && mincost > d[i])
			{
				mincost = d[i];
				u = i;
			}
		}
		color[u] = BLACK;

		if(mincost == INFTY) break;

		for(int i=0; i<n; i++)
		{
			if(color[i] != BLACK && M[u][i] < INFTY)
			{
				if(d[u] + M[u][i] < d[i])
				{
					d[i] = d[u] + M[u][i];
					p[i] = u;
					color[i] = GRAY;
				}
			}
		}
	}
}

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

	dijkstra();

	for(int i=0; i<n; i++)
	{
		printf("%d %d\n", i, d[i]);
	}

	return 0;
}

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

using namespace std;

static const int N = 100;
static const int WHITE = 0;
static const int BLACK = 1;
//int colors[N], d[N];
//
//void dijkstra(vector<vector<int>> &W, int n) {
//    int u, mind;
//    for(int i = 0; i < n; i++) {
//        colors[i] = WHITE;
//        d[i] = INT_MAX;
//    }
//    d[0] = 0;
//    while(1) {
//        u = -1;
//        mind = INT_MAX;
//        for(int i = 0; i < n; i++) {
//            if(colors[i] == WHITE && d[i] < mind) {
//                u = i;
//                mind = d[i];
//            }
//        }
//        if(u == -1) break;
//        colors[u] = BLACK;
//        for(int i = 0; i < n; i++) {
//            if(W[u][i] != -1) {
//                d[i] = min(d[i], mind + W[u][i]);
//            }
//        }
//    }
//}
int d[N];

void dijkstra(vector<vector<int>> &W, int n) {
    int colors[n];
    for(int i=0; i<n; i++) {
        colors[i] = WHITE;
        d[i] = INT_MAX;
    }
    
    d[0] = 0;

    while(1) {
        int u = -1;
        int min_distance = INT_MAX;
        for(int i=0; i<n; i++) {
            if(colors[i] == BLACK) continue;
            if(d[i] < min_distance) {
                u = i;
                min_distance = d[i];
            }
        }
        if(u == -1) break;

        colors[u] = BLACK;
        for(int i=0; i<n; i++) {
            if(colors[i] == BLACK) continue;
            if(W[u][i] == -1) continue;
            d[i] = min(d[i], d[u] + W[u][i]);
        }
    }
}

int main() {
    int n;
    int u, k, v, c;
    cin >> n;
    vector<vector<int>> W(n, vector<int>(n));
    for(int i = 0; i < n; i++)
        for(int j = 0; j < n; j++)
            W[i][j] = -1;
    for(int i = 0; i < n; i++) {
        cin >> u >> k;
        for(int j = 0; j < k; j++) {
            cin >> v >> c;
            W[u][v] = c;
        }
    }

    dijkstra(W, n);

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