Go: package main

import (
	"fmt"
	"container/heap"
)

type Node struct {
	Id int
	Dis int
}

type PriorityQueue []*Node

func (pq PriorityQueue) Len() int { return len(pq) }

func (pq PriorityQueue) Less(i, j int) bool {
	return pq[i].Dis < pq[j].Dis
}

func (pq PriorityQueue) Swap(i, j int) {
	pq[i], pq[j] = pq[j], pq[i]
}

func (pq *PriorityQueue) Push(x interface{}) {
	*pq = append(*pq, x.(*Node))
}

func (pq *PriorityQueue) Pop() interface{} {
	n := len(*pq)
	pop := (*pq)[n-1]
	*pq = (*pq)[0:n-1]
	return pop
}

func main() {
	var n int
	fmt.Scan(&n)

	g := make([][]int, n)
	c := make([][]int, n)
	pq := make(PriorityQueue, 0, n)
	d := make([]int, n)
	for i := 0; i < n; i++ {
		var u,k int
		fmt.Scan(&u)
		fmt.Scan(&k)
		g[u] = make([]int, k)
		c[u] = make([]int, k)
		for j := 0; j < k; j++ {
			fmt.Scan(&g[u][j])
			fmt.Scan(&c[u][j])
		}

		if u == 0 {
			d[u] = 0
		} else {
			d[u] = 1 << 30
		}
		pq.Push(&Node{u, d[u]})
	}
	heap.Init(&pq)

	for pq.Len() > 0 {
		node := heap.Pop(&pq).(*Node)
		for i := 0; i < len(g[node.Id]); i++ {
			nextId := g[node.Id][i]
			nextDis := node.Dis + c[node.Id][i]
			if nextDis < d[nextId] {
				d[nextId] = nextDis
				heap.Push(&pq, &Node{nextId, nextDis})
			}
		}
	}

	for i := 0; i < n; i++ {
		fmt.Println(i, d[i])
	}
}

C++: #include<stdio.h>

#define MAX 1000
#define INFINITY 300000

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

enum Color {
    WHITE,
    GRAY,
    BLACK
};

void dijkstra() {
    for (int i = 0; i < n; ++i) {
        color[i] = WHITE;
        d[i] = INFINITY;
        p[i] = -1;
    }
    d[0] = 0;

    while (true) {
        int min = INFINITY;
        int target = -1;
        for (int i = 0; i < n; ++i) {
            if (d[i] < min && color[i] != BLACK) {
                min = d[i];
                target = i;
            }
        }
        if (target == -1) break;

        color[target] = BLACK;

        for (int v = 0; v < n; ++v) {
            if (color[v] != BLACK && M[target][v] != -1) {
                if(M[target][v] + d[target] < d[v]) {
                    d[v] = d[target] + M[target][v];
                    p[v] = target;
                    color[v] = GRAY;
                }
            }
        }
    }

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

int main() {
    scanf("%d", &n);
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            M[i][j] = -1;
        }
    }
    for (int i = 0; i < n; ++i) {
        int id, k;
        scanf("%d %d", &id, &k);
        for (int j = 0; j < k; ++j) {
            int t;
            scanf("%d", &t);
            scanf("%d", &M[id][t]);
        }
    }
    dijkstra();
    return 0;
}

C++: #include <bits/stdc++.h>
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 dijkstra() {
  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] << 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;
    }
  }

  dijkstra();

};

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <queue>

using namespace std;
static const int MAX=10000;
static const int INFTY = (1<<21);

vector< pair<int,int> >M[MAX]; //?????\??¨
priority_queue< pair<int,int> > PQ; //????????§??????, first???d[i], second???i??? ?????¨??¶?????????first???????????°
bool visited[MAX]; //???????¢??????????
int d[MAX]; //?????????????????¬

void dijkstra_implementsPQ(int n)
{
    //init
    for(int i=0;i<n;i++)
    {
        d[i]=INFTY;
        visited[i]=false;
    }
    //select node 0
    d[0]=0;
    PQ.push(make_pair(0,0));

    while(!PQ.empty())
    {
        //currently the top of PQ is the shortest one
        pair<int,int> temp=PQ.top();PQ.pop();
        int u=temp.second;

        visited[u]=true;
        if(d[u]<temp.first*(-1)) continue;

        //update
        for(int j=0;j<M[u].size();j++)
        {
            int v=M[u][j].first;
            if(visited[v]==true) continue;
            //else try updating
            if(d[v]>d[u]+M[u][j].second)
            {
                d[v]=d[u]+M[u][j].second;
                PQ.push(make_pair(d[v]*(-1),v));
            }
        }
    }
    //print
    for(int i=0;i<n;i++)  cout<<i<<' '<<(d[i]==INFTY?-1:d[i])<<endl;

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

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

    dijkstra_implementsPQ(n);
}

C++: #include<bits/stdc++.h>

using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)

typedef long long ll;
typedef pair<int, int> P;

#define MAX 100005
#define INF INT_MAX

struct Edge {
    int to;
    int cost;
};

int main(int, char**)
{
    int n;
    cin >> n;

    vector< vector<Edge> > G(n);
    rep(i,n) {
        int u, k;
        cin >> u >> k;
        rep(j,k) {
            int v, c;
            cin >> v >> c;
            G[u].push_back({v, c});
        }
    }
    priority_queue<P> q;
    vector<int> d(n, INF);
    d[0] = 0;
    q.push({0, 0});
    while (!q.empty()) {
        int v, c;
        tie(c,v) = q.top(); q.pop();
        if (d[v] < c) continue;
        for (auto e : G[v]) {
            if (d[e.to] <= d[v] + e.cost) continue;
            d[e.to] = d[v] + e.cost;
            q.push({d[e.to], e.to});
        }
    }
    rep(i,n) cout << i << " " << d[i] << endl;

    return 0;
}

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

int n;
vector<pair<int, int>> adj[100];
int *d;

void dijkstra() {
    priority_queue<pair<int, int>> PQ;
    int d[n], color[n];

    for (int i = 0; i < n; i++) {
        d[i] = INFTY;
        color[n] = WHITE;
    }
    d[0] = 0;
    PQ.push(make_pair(0, 0));

    while (!PQ.empty()) {
        pair<int, int> f = PQ.top();
        PQ.pop();

        int u = f.second;
        color[u] = BLACK;

        if (d[u] < f.first * (-1)) { continue; }

        for (int j = 0; j < adj[u].size(); j++) {
            int v = adj[u][j].first;
            if (color[v] == BLACK) { continue; }
            if (d[u] + adj[u][j].second < d[v]) {
                d[v] = d[u] + adj[u][j].second;
                // printf("d[%d] = %d\n", v, d[v]);
                PQ.push(make_pair(d[v] * (-1), v));
                color[v] = GRAY;
            }
        }
    }
    
    for (int i = 0; i < n; i++) {
        printf("%d %d\n", i, d[i]);
    }
}

int main() {
    int u, k, v, c;
    scanf("%d", &n);

    // adj = new vector<pair<int, int>>[n];

    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);
            adj[u].push_back(make_pair(v, c));
        }
    }

    dijkstra();

    return 0;
}