Go: package main

import (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"os"
	"strconv"
	"strings"
)

const (
	INFTY = 1 << 21
	NIL   = -1
)

const (
	WHITE = iota
	GRAY
	BLACK
)

type Graph [][]int

func (g *Graph) dikstra(n int) string {
	var (
		u, minv = 0, 0
	)

	d := make([]int, n)
	color := make([]int, n)

	for i := 0; i < n; i++ {
		d[i] = INFTY
		color[i] = WHITE
	}
	d[0] = 0
	color[0] = GRAY

	for {
		minv = INFTY
		u = -1
		for 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 v := 0; v < n; v++ {
			if color[v] != BLACK && (*g)[u][v] != INFTY {
				if d[v] > d[u]+(*g)[u][v] {
					d[v] = d[u] + (*g)[u][v]
					color[v] = GRAY
				}
			}
		}
	}

	var out bytes.Buffer
	for i := 0; i < n; i++ {
		out.WriteString(fmt.Sprintf("%d ", i))
		if d[i] == INFTY {
			out.WriteString(fmt.Sprintf("%d\n", -1))
			continue
		}
		out.WriteString(fmt.Sprintf("%d\n", d[i]))
	}

	return strings.TrimRight(out.String(), "\n")
}

func answer(reader io.Reader) string {
	sc := bufio.NewScanner(reader)
	sc.Split(bufio.ScanWords)

	sc.Scan()
	n, _ := strconv.Atoi(sc.Text())

	g := make(Graph, n)
	for i := 0; i < n; i++ {
		g[i] = make([]int, n)
		for j := 0; j < n; j++ {
			g[i][j] = INFTY
		}
	}

	for i := 0; i < n; i++ {
		sc.Scan()
		u, _ := strconv.Atoi(sc.Text())
		sc.Scan()
		k, _ := strconv.Atoi(sc.Text())

		for j := 0; j < k; j++ {
			sc.Scan()
			v, _ := strconv.Atoi(sc.Text())
			sc.Scan()
			c, _ := strconv.Atoi(sc.Text())

			g[u][v] = c
		}
	}

	return g.dikstra(n)
}

func main() {
	fmt.Println(answer(os.Stdin))
}

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

#define MAX_N (105)
#define MAX_D (100010)
#define INF (MAX_N * MAX_D)

int n;

int G[MAX_N][MAX_N];
int dist[MAX_N];
bool arrived[MAX_N];

void dijkstra(int s)
{
    for ( int i = 0; i < n; i++ ) dist[i] = INF;

    dist[s] = 0;

    while ( true ) {
	int min_dist = INF;
	int index = -1;
	for ( int i = 0; i < n; i++ ) {
	    if ( !arrived[i] && dist[i] < min_dist ) {
		min_dist = dist[i];
		index = i;
	    }
	}
	
	if ( index == -1 ) break;
	arrived[index] = true;

	for ( int i = 0; i < n; i++ ) {
	    if ( !arrived[i] && G[index][i] != INF ) {
		if ( dist[i] > (dist[index] + G[index][i]) ) {
		    dist[i] = dist[index] + G[index][i];
		}
	    }
	}
    }
}


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

    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++ ) {
	int u, k;
	scanf("%d %d", &u, &k);

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

    dijkstra(0);

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

    return 0;
}

C++: #include <iostream>
#define MAX 100
#define INF (1<<21)
#define WHITE 0
#define GRAY  1
#define BLACK 2 
using namespace std;

int n, adj_M[MAX][MAX];

void Dijkstra()
{
    int next, min_cost;
    int min_dist[n+1], color[n+1], parent[n+1];

    for (int i = 0; i < n; ++i) 
    {
        color[i]  = WHITE;
        parent[i] = -1;
        min_dist[i] = INF;
    }

    min_dist[0] = 0;

    while (true) 
    {
        min_cost = INF;
        next = -1;
        for (int i = 0; i < n; ++i) 
        {
            if (color[i] != BLACK && min_dist[i] < min_cost) 
            {
                min_cost = min_dist[i];
                next = i;
            }
        }
        if (next == -1) break;
        color[next] = BLACK;

        for (int i = 0; i < n; ++i) 
        {
            if (color[i] != BLACK && adj_M[next][i] != INF)
            {
                if (min_dist[next] + adj_M[next][i] < min_dist[i])
                {
                    color[i] = GRAY;
                    min_dist[i] = min_dist[next] + adj_M[next][i];
                    parent[i] = next;
                }
            }
        }
    }

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

int main() 
{
    int id, deg, n_id, n_w;
    cin >> n; 

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

    for (int i = 0; i < n; ++i) 
    {
        cin >> id >> deg;
        for (int j = 0; j < deg; ++j) 
        {
            cin >> n_id >> n_w;
            adj_M[id][n_id] = n_w;
        }
    }

    Dijkstra();
}

C++: #include <iostream>
#include <vector>
#include<climits>

using namespace std;

int n;
vector<int> g[100];
vector<int> w[100];
int d[100];
char color[100];

void dijkstra() {
    d[0] = 0;
    color[0] = 'b';

    for (int k = 1; k < n; ++k) {
        int next;
        int mine = INT_MAX;
        for (int i = 0; i < n; ++i) {
            if (color[i] == 'b') {
                for (int j = 0; j < g[i].size(); ++j) {
                    if (d[i] + w[i].at(j) <= d[g[i].at(j)] && color[g[i].at(j)] == 'w') {
                        d[g[i].at(j)] = d[i] + w[i].at(j);
                        if (d[g[i].at(j)] <= mine) {
                            next = g[i].at(j);
                            mine = d[next];
                        }
                    }
                }
            }
        }
        color[next] = 'b';
        d[next] = mine;
    }
}

int main() {
    cin >> n;
    for (int i = 0; i < n; ++i) {
        int u;
        int k;
        cin >> u >> k;
        int v, c;
        for (int j = 0; j < k; ++j) {
            cin >> v >> c;
            g[u].push_back(v);
            w[u].push_back(c);
        }
    }
    for (int m = 0; m < n; ++m) {
        color[m] = 'w';
        d[m] = INT_MAX;
    }

    dijkstra();

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

    return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<functional>
#include<map>
#include<cstring>
#define P pair<int,int>//cost to
using namespace std;

vector<P>rinsetu[100];
int mincost[100];
signed main() {
	int a; cin >> a;
	for (int b = 0; b < a; b++) {
		int c, d; cin >> c >> d;
		for (int e = 0; e < d; e++) {
			int f, g; scanf("%d%d", &f, &g);
			rinsetu[c].push_back(P(g,f));
		}
	}
	fill(mincost, mincost + a, 1 << 29);
	mincost[0] = 0;
	priority_queue<P, vector<P>, greater<P>>Q;
	Q.push(P(0,0));
	while (Q.size()) {
		P t = Q.top(); Q.pop();
		if (t.first > mincost[t.second])continue;
		for (P i : rinsetu[t.second]) {
			if (mincost[i.second] > t.first + i.first) {
				mincost[i.second] = t.first + i.first;
				Q.push(P(t.first + i.first,i.second));
			}
		}
	}
	for (int i = 0; i < a; i++) {
		cout << i << " " << mincost[i] << endl;
	}
}

C++: #include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <utility>
#include <stack>
#include <functional>
#include <queue>
#include <cmath>
#include <set>
#include <map>
#include <numeric>

#define rep(i,j,k) for(int i=(int)j;i<(int)k;i++)
#define Sort(x) sort((x).begin(),(x).end())
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define vi vector<int>
#define INF (int)1e9
#define INFL 1e18
#define MOD 1000000007
#define pb push_back
#define MP make_pair
typedef long long int ll;
typedef std::pair<int,int> P;
int D=1;
int dx[4]={0,1,0,-1},dy[4]={1,0,-1,0};

using namespace std;

int main(){
    int n;cin>>n;
    vector<vector<int>> v(n,vector<int>(n,INF));
    rep(i,0,n)v[i][i]=0;
    rep(i,0,n){
        int u,k; cin>>u>>k;
        rep(j,0,k){
            int to,cost;
            cin>>to>>cost;
            v[u][to]=cost;
        }
    }
    
    rep(i,0,n){
        rep(j,0,n){
            rep(k,0,n){
                v[j][k]=min(v[j][k],v[j][i]+v[i][k]);
            }
        }
    }
    rep(i,0,n){
        cout<<i<<" "<<v[0][i]<<endl;
    }
    
    return 0;
}