Go: package main

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

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

	g := make([][]int, n)
	c := make([][]int, n)
	pq := make(PriorityQueue, 0, n)
	d := make([]int, n)
	for i := 0; i < n; i++ {
		sc.Scan()
		u, _ := strconv.Atoi(sc.Text())
		sc.Scan()
		k, _ := strconv.Atoi(sc.Text())
		g[u] = make([]int, k)
		c[u] = make([]int, k)
		for j := 0; j < k; j++ {
			sc.Scan()
			g[u][j], _ = strconv.Atoi(sc.Text())
			sc.Scan()
			c[u][j], _ = strconv.Atoi(sc.Text())
		}

		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})
			}
		}
	}

	wr := bufio.NewWriter(os.Stdout)
	for i := 0; i < n; i++ {
		wr.WriteString(strconv.Itoa(i))
		wr.WriteString(" ")
		wr.WriteString(strconv.Itoa(d[i]))
		wr.WriteString("\n")
	}
	wr.Flush()
}

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

using namespace std;
using ll = long long;

template <class T>
struct Edge {
    int to;
    T cost;
    Edge(int to, T cost) : to(to), cost(cost){};
};

template <class T = int>
class Graph {
public:
    explicit Graph(int N = 0) : size(N) { path.resize(size); }
    void span(int u, int v, T cost = 1) { path[u].push_back(Edge<T>(v, cost)); }
    vector<Edge<T>> operator[](int v) const { return path[v]; }

    int size;
    vector<vector<Edge<T>>> path;
};

const ll INF = 1LL << 50;

template <class T>
vector<T> dijkstra(const Graph<T>& graph, int s) {
    vector<T> dist(graph.size, INF);
    dist[s] = 0;

    priority_queue<pair<int, T>, vector<pair<int, T>>, greater<pair<int, T>>> que;
    que.push(make_pair(0, s));

    while (!que.empty()) {
        int v;
        T d;
        tie(d, v) = que.top();
        que.pop();
        if (d > dist[v]) continue;

        for (const auto& e : graph[v]) {
            if (dist[e.to] <= dist[v] + e.cost) continue;
            dist[e.to] = dist[v] + e.cost;
            que.push(make_pair(dist[e.to], e.to));
        }
    }
    return dist;
}

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

    Graph<ll> graph(N);
    for (int i = 0; i < N; ++i) {
        int v, k;
        cin >> v >> k;
        for (int j = 0; j < k; ++j) {
            int sv;
            ll c;
            cin >> sv >> c;
            graph.span(v, sv, c);
        }
    }

    auto dist = dijkstra<ll>(graph, 0);
    for (int v = 0; v < N; ++v) cout << v << " " << dist[v] << endl;
    return 0;
}

C++: #include<bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
typedef long long ll;
typedef pair<ll, ll> PLL;
typedef vector<int> VI;
typedef vector<char> VC;
typedef vector<double> VD;
typedef vector<string> VS;
typedef vector<ll> VLL;
typedef vector<PLL> VP;
const static int INF = 1000000000;
const static int MOD = 1000000007;
const int dx[4]={1, 0, -1, 0};
const int dy[4]={0, 1, 0, -1};
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
#define rep(i,n) for (ll i=0; i<(ll)(n); i++)
#define repd(i,n) for (ll i=n-1; i>=0; i--)
#define rept(i,m,n) for(ll i=m; i<n; i++)
#define stl_rep(itr, x) for (auto itr = x.begin(); itr != x.end(); ++itr)
#define all(x) (x).begin(), (x).end()
#define F first
#define S second
#define PF push_front
#define PB push_back
#define SORT(V) sort((V).begin(), (V).end())
#define RVERSE(V) reverse((V).begin(), (V).end())
#define paired make_pair
#define PRINT(V) for(auto v : (V)) cout << v << " "
//charを整数に
int ctoi(char c) { if (c >= '0' && c <= '9') { return c - '0'; } return 0; }
// 累積和 for (int i = 0; i < N; ++i) s[i+1] = s[i] + a[i]; 
void cum_sum(int N,vector<double> a, vector<double> &s){ for(int i=0; i<N; i++){ s[i+1]=s[i]+a[i];}}
//ユークリッドの控除法
ll gcd(ll a,ll b){
    if(b == 0) return a;
    return gcd(b,a%b);
}
//最小公倍数
ll lcm(ll a,ll b){
    ll g = gcd(a,b);
    return a / g * b; // Be careful not to overflow
}
//素数判定
bool is_prime(long long n) {
    if (n <= 1) return false;
    for (long long p = 2; p * p <= n; ++p) {
        if (n % p == 0) return false;
    }
    return true;
}
int getdigit(ll num){
    unsigned digit=0;
    while(num!=0){
        num /= 10;
        digit++;
    }
    return digit;
}
//空白文字も入力 getline(cin, S);
//桁数指定 setprecision
int n;
vector<vector<pair<int, int>>> G;

void dijkstra(){
    priority_queue<pair<int, int>> PQ;
    int color[10000];
    int d[10000];
    rep(i,n){
        d[i]=INF;
        color[i]=0;
    }
    d[0]=0;
    PQ.push(make_pair(0,0));
    color[0]=1;

    while(!PQ.empty()){
        pair<int, int> f=PQ.top(); PQ.pop();
        int u=f.S;
        color[u]=2;
        if(d[u]<f.F*(-1)) continue;
        rep(j,G[u].size()){
            int v=G[u][j].F;
            if(color[v]==2) continue;
            if(d[v]>d[u]+G[u][j].S){
                d[v]=d[u]+G[u][j].S;
                PQ.push(make_pair(d[v]*-1,v));
                color[v]=1;
            }
        }
    }
    rep(i,n){
        cout << i << " " << (d[i]==INF ? -1 : d[i]) << endl;
    }
}

int main()
{
    ios::sync_with_stdio(0); 
    cin.tie(0); 
    cout.tie(0);
    cin >> n;
    G.resize(n);
    rep(i,n){
        int u,k;
        cin >> u >> k;
        rep(j,k){
            int v,c;
            cin >> v >> c;
            G[u].PB(make_pair(v,c));
        }
    }
    dijkstra();
}

C++: #include<iostream>
#include <vector>
#include<algorithm>
#include <queue>
#define rep(i, a) for(int i=0; i<(int)(a); i++)
using namespace std;
int v, n, c, e,u,r,k;
const  long long int INF = (1<<21);
vector<pair<int, int>> ad[10000];
 void dijkstra() {
     priority_queue<pair<int, int>> p;
     int d[10000], co[10000];
     rep(i, n) {
         d[i] = INF;
         co[i] = 0;
     }
     d[0] = 0;
     p.push(make_pair(0, 0));
     co[0] = 1;
     while (!p.empty()) {
         pair<int, int> f = p.top();p.pop();
         int u = f.second;
         co[u] = 2;
         if (d[u] < f.first * (-1)) continue;
         rep(j, ad[u].size()) {
             int v = ad[u][j].first;
             if (co[v] != 2) {
                 if (d[v] > d[u] + ad[u][j].second) {
                     d[v] = d[u] + ad[u][j].second;
                     p.push(make_pair(d[v] * (-1), v));
                     co[v] = 1;
                 }
             }
         } 
     }
     rep(i, n) {
         cout << i << " " << (d[i] == INF ? -1 : d[i]) << endl;
     }
}
int main()
{
    cin >> n;
    rep(i, n) {
        cin >> u >> k;
        rep(j, k) {
            cin >> v >> c;
            ad[u].push_back(make_pair(v, c));
        }
    }
    dijkstra();
}