Go: package main

import (
	"strconv"
	"fmt"
	"bufio"
	"os"
)
const INF = 1 << 21
var scanner = bufio.NewScanner(os.Stdin)

func nextInt() int {
	scanner.Scan()
	i, e := strconv.Atoi(scanner.Text())
	if e != nil {
		panic(e)
	}
	return i
}


func main() {
	scanner.Split(bufio.ScanWords)
	n := nextInt()
	adj := make([][]int, n)
	for i := range adj {
		adj[i] = make([]int, n)
	}

	for i := 0;i < n; i++ {
		u := nextInt()
		k := nextInt()
		for j := 0; j < k; j++ {
			v := nextInt()
			c := nextInt()
			adj[u][v] = c
		}
	}

	// for i := range adj {
	// 	fmt.Println(adj[i])
	// }

	dist := make([]int, n)
	prev := make([]int, n)
	visited := make([]bool, n)
	dijkstra := func(start int, size int) {
		for i := 0; i < size; i++ {
			dist[i] = INF
			prev[i] = -1
			visited[i] = false
		}
		dist[start] = 0
		for {
			u := -1
			tmp_min := INF
			for i := 0; i < size; i++ {
				if visited[i] == false && dist[i] < tmp_min {
					tmp_min = dist[i]
					u = i
				}
			}
			if u == -1 {
				break
			}
			visited[u] = true
			for i := 0; i < size; i++ {
				if adj[u][i] > 0 {
					w := adj[u][i]
					newlen := dist[u] + w
					if newlen < dist[i] {
						dist[i] = newlen
						prev[i] = u
					}
				}
			}
		}
	}
	dijkstra(0, n)
	for i, cost := range dist {
		fmt.Printf("%d %d\n", i, cost)
	}
}

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

const int INF = 0xfffffff;
const int MAX = 10000;

struct Edge {
	Edge() {};
	Edge(int v, int c) :v(v), c(c) {};
	bool operator < (const Edge& e)const {
		return c > e.c;
	}
	int v;
	int c;
};

int main() {
	int n;
	priority_queue<Edge> graph[MAX];
	vector<Edge> table;
	bool check[MAX] = { false };
	int ary[MAX] = { 0 };

	cin >> n;

	for (int i = 0; i < n; i++) {
		int u, k;
		cin >> u >> k;
		for (int j = 0; j < k; j++) {
			Edge e;
			cin >> e.v >> e.c;
			graph[u].push(e);
		}
	}

	Edge e(0, 0);
	table.push_back(e);
	check[0] = true;

	for (int i = 1; i < n; i++) {
		Edge minv(0, INF);
		int erase = 0;

		for (int j = 0; j < table.size(); j++) {
			int v = table[j].v;
			int c = table[j].c;	
			while (!graph[v].empty() && check[graph[v].top().v])graph[v].pop();
			if (graph[v].empty())continue;
			if (c + graph[v].top().c < minv.c) {
				minv.c = c + graph[v].top().c;
				minv.v = graph[v].top().v;
				erase = v;
			}
		}
		table.push_back(minv);
		check[minv.v] = true;
		graph[erase].pop();
	}
	
	for (int i = 0; i < n; i++) {
		ary[table[i].v] = table[i].c;
	}
	for (int i = 0; i < n; i++) {
		cout << i << " " << ary[i] << endl;
	}

	return 0;
}

C++: #include <cstdio>
#include <queue>
#include <utility>
using namespace std;
static const int INFTY = (1 << 10);
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() {
    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;
}

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

using namespace std;

const int INFTY = (1 << 30);

struct Node
{
    int node;
    int cost;
    Node(int n = 0, int c = INFTY) : node(n), cost(c) {}
};

bool operator<(const Node &n1, const Node &n2)
{
    return n1.cost < n2.cost;
}

class Dks
{
    vector<vector<int>> cost;
    vector<int> state, parent, dist;

public:
    Dks(int n = 0)
    {
        cost.resize(n);
        state.resize(n);
        parent.resize(n);
        dist.resize(n, INFTY);
    }

    void load_cost()
    {
        int node, n_v, v, c;
        for (int i = 0; i < cost.size(); i++)
        {
            cin >> node >> n_v;
            cost.at(node).resize(cost.size(), INFTY);
            for (int j = 0; j < n_v; j++)
            {
                cin >> v >> c;
                cost.at(node).at(v) = c;
            }
        }
    }

    void dks(int node)
    {
        int min_value;
        dist[node] = 0;
        while(true)
        {
            node = -1;
            min_value = INFTY;
            for(int i = 0;i<cost.size();i++){
                if(state[i] == 0 && dist[i] < min_value){
                    node = i;
                    min_value = dist[i];
                }
            }
            if(node == -1) break;
            state[node] = 1;

            for (int j = 0; j < cost.size(); j++)
            {
                if(cost[node][j] == INFTY) continue;
                if (state[j] == 0 && dist[j] > dist[node] + cost[node][j])
                {
                    dist[j] = dist[node] + cost[node][j];
                    parent[j] = node;
                }
            }
        }
    }

    void print(){
        for(int i=0;i<cost.size();i++){
            cout << i << " " << (dist[i] == INFTY ? -1 : dist[i]) << endl;
        }
    }
};

int main()
{
    int N;
    cin >> N;
    Dks dks(N);
    dks.load_cost();
    dks.dks(0);
    dks.print();
}

C++: #include <stdio.h>
#include <string.h>
#include <iostream>
#include <vector>
#include <deque>
#include <queue>
#include <stack>
#include <map>
#include <string>
#include <algorithm>
#include <numeric>
#include <utility>
#include <cmath>

using namespace std;

typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, int> pli;

const int iinf = 1 << 29;
const long long linf = 1ll << 61;

#define dump(x) cerr << #x << " : " << x << '\n'
#define MOD(x, y) (((y) + (x) % (y)) % (y))

int N;

int main(int argc, char* argv[])
{
	using COST_T = ll;
	using NODE_T = int;
	using PAIR_T = pair<COST_T, NODE_T>;

	struct Edge
	{
		NODE_T node;
		COST_T cost;
	};

	const int MAX_NODE_INDEX = 99;
	const COST_T INF_DIST = linf;
	vector<Edge> edges[MAX_NODE_INDEX + 1];
	COST_T dist_ar[MAX_NODE_INDEX + 1];

	scanf("%d", &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);
			edges[u].push_back( { v, c } );
		}
	}

	priority_queue<PAIR_T, vector<PAIR_T>, greater<PAIR_T>> pq;
	fill(dist_ar, dist_ar + MAX_NODE_INDEX + 1, INF_DIST);
	NODE_T st = 0;
	dist_ar[st] = 0;
	pq.push(PAIR_T(0, st));
	while(!pq.empty()) {
		COST_T temp_cost = pq.top().first;
		NODE_T node_index = pq.top().second;
		pq.pop();
		if (dist_ar[node_index] < temp_cost) continue;
		for (int next_list_index = 0; next_list_index < (int)edges[node_index].size(); next_list_index++) {
			COST_T new_cost = temp_cost + edges[node_index][next_list_index].cost;
			NODE_T next_index = edges[node_index][next_list_index].node;
			if (dist_ar[next_index] >= new_cost) {
				dist_ar[next_index] = new_cost;
				pq.push(PAIR_T(new_cost, next_index));
			}
		}
	}

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

	return 0;
}