Go: package main

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

const BIG_COST = 200000

const (
	ST_NOT_YET = iota
	ST_JOINED
)

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	nNodes := scanInt(sc)

	costs := make([][]int, nNodes)
	graph := make([][]int, nNodes)

	states := make([]int, nNodes)
	costSums := make([]int, nNodes)

	for i := 0; i < nNodes; i++ {
		costs[i] = make([]int, nNodes)
		costSums[i] = BIG_COST
	}

	for i := 0; i < nNodes; i++ {
		u := scanInt(sc)
		k := scanInt(sc)
		graph[u] = make([]int, k)
		for d := 0; d < k; d++ {
			v := scanInt(sc)
			graph[u][d] = v
			costs[u][v] = scanInt(sc)
		}
	}

	costSums[0] = 0
	for {
		minCost := BIG_COST
		var u int

		for i, cost := range costSums {
			if states[i] != ST_JOINED && cost < minCost {
				minCost = cost
				u = i
			}
		}

		if minCost == BIG_COST {
			break
		}

		states[u] = ST_JOINED

		for _, v := range graph[u] {
			cost := minCost + costs[u][v]
			if cost < costSums[v] {
				costSums[v] = cost
			}
		}
	}

	w := bufio.NewWriter(os.Stdout)
	for i, cost := range costSums {
		fmt.Fprintf(w, "%d %d\n", i, cost)
	}
	w.Flush()
}

func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	v, _ := strconv.Atoi(sc.Text())
	return v
}

C++: #include<bits/stdc++.h>
using namespace std;
static const int INF=1000000;
int n;
int G[100][100];
int d[100];
int color[100];

void dijkstra(){
  int minv;
  for(int i=0;i<n;i++){
    d[i]=INF;
    color[i]=0;
  }
  
  color[0]=1;
  d[0]=0;
  
  while(1){
    minv=INF;
    int u=-1;
    for(int i=0;i<n;i++){
      if(minv>d[i] && color[i] !=2){
        u=i;
        minv=d[i];
      }
    }
    if(u==-1) break;
    color[u]=2;
    
    for(int v=0;v<n;v++){
      if(color[v]!=2 &&G[u][v] !=INF){
        if(d[v]>d[u]+G[u][v]){
          d[v]=d[u]+G[u][v];
          color[v]=1;
        }
      }
    }
  }
  
  for(int i=0;i<n;i++){
    cout<<i<<" "<<d[i]<<endl;
  }
}

int main(){
  cin>>n;
  int u,k,v,c;
  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
      G[i][j]=INF;
    }
  }
  
  for(int i=0;i<n;i++){
    cin>>u>>k;
    for(int i=0;i<k;i++){
      cin>>v>>c;
      G[u][v]=c;
    }
  }
  
  dijkstra();
  return 0;
}

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

#define go first
#define ct second

int cost[100 + 10] , cost_ps[100 + 10];
int n,vf,k,v,c;

int v_k[100];

vector< pair<int, int> > went[100];

pair<int, int> p_tmp;

int  check_go(int st)
{
	int i;
	int ret=0;

	for (i = 0; i < v_k[st]; i++)
	{
		if (cost_ps[went[st][i].go] > cost[st] + went[st][i].ct || cost_ps[went[st][i].go] == -1)
		{
			cost_ps[went[st][i].go] = cost[st] + went[st][i].ct;
		}
	}

	for (i = 1; i < n; i++)
	{
		//cout << "Z" << i << endl;
		if ( (cost_ps[ret] > cost_ps[i] && cost[i]==-1 || cost[ret] != -1 ) && cost_ps[i]!=-1 )
		{
			//cout << "B" << cost[ret] << endl;
			ret = i;
			//printf("ret=%d\n", ret);
		}
	}
	//cout << cost_ps[ret] << endl;

	cost[ret] = cost_ps[ret];
	//cout << "A" << cost[ret] << endl;

	return ret;

}

int main()
{
	int i,j;
	int st_num=0;

	cin >> n;

	for (i = 0; i < n; i++)
	{
		cost[i] = cost_ps[i] = -1;

		cin >> vf ;
		cin >> v_k[vf];
		for (j = 0; j < v_k[vf] ; j++)
		{
			cin >> p_tmp.go >> p_tmp.ct;

			went[vf].push_back(p_tmp);
		}
	}

	cost[0] = cost_ps[0] = 0;

	for (i = 1; i < n; i++)
	{
		st_num = check_go(st_num);
	}

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

	return 0;
}

C++: #include<iostream>
#include<cstdio>
#define INF 1000000
#define NIL -2
#define GRAY -3
#define WHITE -4
#define BRACK -5

using namespace std;

int n;
int M[101][101];
int d[101];//重み
//int p[101];//親
int color[101];
int sum = 0;

void Dijkstra(int u) {
	//cout << u << endl;
	color[u] = BRACK;

	//重みの更新
	for (int i = 0; i < n; i++) {
		if (color[i] != BRACK && M[u][i] != 0) {
			color[i] = GRAY;
			if ((d[u] + M[u][i]) < d[i]) {
				d[i] = d[u] + M[u][i];
			}
		}
	}
	
	int min = -1;
	d[min] = 100000;


	for (int v = 0; v < n; v++) {
		if (color[v] != BRACK) {
			if (d[v] < d[min]) {
				min = v;
			}
			else {
				color[v] = WHITE;
			}
		}
	}

	if (min != -1) {
		Dijkstra(min);
	}
}

int main() {
	cin >> n;
	int v, k, g, weight; //v = 節点番号　g = 次数

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

	for (int i = 0; i < n; i++) {
		cin >> v >> g;
		for (int j = 0; j < g; j++) {
			cin >> k;
			cin >> M[i][k];
		}
	}

	for (int i = 1; i <= n; i++) {
		color[i] = WHITE;
	}

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

	d[0] = 0;

	//関数
	Dijkstra(0);

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

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define MAX 100
#define WHITE 0
#define BLACK 1
#define INFTY 100000001

// グラフの頂点数
int n;
// 隣接行列
vector<vector<int> > M(MAX, vector<int>(MAX, -1));
// 頂点の状態を表す配列
vector<int> color(MAX, WHITE);
// d[v]は始点sからS内の点のみを通ってvに行く経路の最小コスト
vector<int> d(MAX, INFTY);

void dijkstra()
{
  // 初期化
  d.at(0) = 0;

  // 初期状態でSの頂点数は0
  while (1)
  {
    // uはV-Sの頂点でd[u]が最小となるもの
    int u;
    int m = INFTY;
    for (int i = 0; i < n; i++)
    {
      // dが未設定の頂点については条件式の右の条件ではじかれる
      if (color.at(i) == WHITE && d.at(i) < m)
      {
        m = d.at(i);
        u = i;
      }
    }

    if (m == INFTY)
    {
      // V=Sとなったとき
      break;
    }

    // uをSに追加する
    color.at(u) = BLACK;

    // uに隣接するV-Sの頂点のdを更新する
    for (int i = 0; i < n; i++)
    {
      if (M.at(u).at(i) != -1 && color.at(i) == WHITE)
      {
        // iはuと隣接しているV-Sの頂点
        d.at(i) = min(d.at(i), d.at(u) + M.at(u).at(i));
      }
    }
  }
}

int main()
{
  cin >> n;
  for (int i = 0; i < n; i++)
  {
    int u, m;
    cin >> u >> m;
    for (int j = 0; j < m; j++)
    {
      int v, c;
      cin >> v >> c;
      M.at(u).at(v) = c;
    }
  }

  dijkstra();

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

C++: #include <iostream>

using namespace std;

#define MAX 100
#define WHITE 0
#define GRAY 1
#define BLACK 2
#define INFTY 99999999

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

int dijkstra(int s)
{

	int mincost;
	int u;

	for (int i = 0; i < n; i++) {
		d[i] = INFTY;
		p[i] = -1;
	}
	d[s] = 0;

	while (true) {
		mincost = INFTY;

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

		if (mincost == INFTY) {
			break;
		}

		color[u] = BLACK;

		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 sum = 0;

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

	return sum;


}

int main(void)
{

	cin >> n;

	int u;
	int k;
	int v;

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


	for (int i = 0; i < n; i++) {
		cin >> u >> k;
		for (int j = 0; j < k; j++) {
			cin >> v;
			cin >> M[u][v];
		}
	}

	dijkstra(0);

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

	return 0;
}