Go: package main

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

const (
	MAX_N      = 100
	MAX_WEIGHT = 100000
)

type Edge struct {
	start  int
	end    int
	weight int
}

type ShortestInfo struct {
	edges    []Edge
	shortest int
}

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

	n, err := nextInt(sc)
	if err != nil {
		panic(err)
	}

	shortestList := make([]ShortestInfo, n)
	for i := 1; i < n; i++ {
		shortestList[i] = ShortestInfo{edges: []Edge{}, shortest: MAX_N*MAX_WEIGHT + 1}
	}

	adjacentMatrix, err := createAdjacentMatrix(n, sc)
	if err != nil {
		panic(err)
	}

	sssp([]int{1}, shortestList, adjacentMatrix)
	for _, v := range shortestList {
		fmt.Printf("%d %d\n", v.getEnd()-1, v.shortest)
	}
}

func (si ShortestInfo) getEnd() int {
	if len(si.edges) == 0 {
		return 1
	} else {
		return si.edges[len(si.edges)-1].end
	}
}

func createAdjacentMatrix(n int, sc *bufio.Scanner) ([][]int, error) {
	adjacentMatrix := make([][]int, n)
	for i := 0; i < n; i++ {
		id, err := nextInt(sc)
		if err != nil {
			return nil, err
		}
		adjacentMatrix[id] = make([]int, n)
		for j := 0; j < n; j++ {
			adjacentMatrix[id][j] = -1
		}
		vertexNum, err := nextInt(sc)
		if err != nil {
			return nil, err
		}
		for j := 0; j < vertexNum; j++ {
			v, err := nextInt(sc)
			if err != nil {
				return nil, err
			}
			c, err := nextInt(sc)
			if err != nil {
				return nil, err
			}
			adjacentMatrix[id][v] = c
		}
	}
	return adjacentMatrix, nil
}

func sssp(nodeStack []int, shortestList []ShortestInfo, adjacentMatrix [][]int) {
	for len(nodeStack) > 0 {
		currentNode := nodeStack[0]
		nodeStack = nodeStack[1:]
		currentShortest := getShortest(currentNode, shortestList)
		adjacents := findAdjacents(currentNode, adjacentMatrix)
		for i := 0; i < len(adjacents); i++ {
			adj := adjacents[i]
			if currentShortest.shortest+adj.weight < getShortest(adj.end, shortestList).shortest {
				setShortest(adj.end, adj, currentShortest, shortestList)
				nodeStack = append(nodeStack, adj.end)
			}
		}
	}
}

func getShortest(node int, shortestList []ShortestInfo) ShortestInfo {
	return shortestList[node-1]
}

func setShortest(node int, edge Edge, currentShortest ShortestInfo, shortestList []ShortestInfo) {
	newEdges := make([]Edge, len(currentShortest.edges)+1)
	for i := 0; i < len(newEdges)-1; i++ {
		newEdges[i] = currentShortest.edges[i]
	}
	newEdges[len(newEdges)-1] = edge
	shortestInfo := ShortestInfo{edges: newEdges, shortest: currentShortest.shortest + edge.weight}
	shortestList[node-1] = shortestInfo
}

func findAdjacents(currentNode int, adjacentMatrix [][]int) []Edge {
	adjacents := adjacentMatrix[currentNode-1]
	edges := []Edge{}
	for i, v := range adjacents {
		if v > 0 {
			edges = append(edges, Edge{start: currentNode, end: i + 1, weight: v})
		}
	}
	return edges
}

func nextInt(sc *bufio.Scanner) (int, error) {
	sc.Scan()
	return strconv.Atoi(sc.Text())
}

C++: #include <bits/stdc++.h>
#define _overload3(_1, _2, _3, name, ...) name
#define _rep(i, n) repi(i, 0, n)
#define repi(i, a, b) for (ll i = (ll)(a); i < (ll)(b); ++i)
#define rep(...) _overload3(__VA_ARGS__, repi, _rep, )(__VA_ARGS__)
#define ll long long
#define lld long double
#define ALL(x) x.begin(), x.end()
#ifdef DEBUG
#define line() cerr << "[" << __LINE__ << "] ";
#define dump(i) cerr << #i ": " << i << " ";
#define dumpl(i) cerr << #i ": " << i << endl;
#else
#define line(i)
#define dump(i)
#define dumpl(i)
#endif
using namespace std;
typedef map<int, vector<int>> Graph;
typedef map<int, map<int, int>> WGraph;
typedef pair<int, int> Edge;

map<Edge, bool> mp;
map<int, int> back;
vector<int> dijkstra(int v, WGraph &g, int r)
{
    vector<int> cost(v, 1 << 30);
    cost[r] = 0;
    priority_queue<pair<int, int>> pq;

    pq.push({0, r});

    while (!pq.empty())
    {
        //cerr << "-------------------------------" << endl;
        auto t = pq.top();
        pq.pop();
        //cerr << t.second << "," << t.first << endl;
        if (cost[t.second] < -t.first)
        {
            continue;
        }
        for (auto x : g[t.second])
        {
            if (cost[x.first] > cost[t.second] + g[t.second][x.first])
            {
                cost[x.first] = cost[t.second] + g[t.second][x.first];
                //cerr << "update cost[" << x.first << "] with " << cost[x.first] << endl;
                back[x.first] = t.second;
                pq.push({-cost[x.first], x.first});
            }
        }
    }
    return cost;
}

int main(int argc, char const *argv[])
{
    int n;
    cin >> n;
    WGraph g;
    rep(i, n)
    {
        int k;
        cin >> k >> k;
        rep(j, k)
        {
            int v, c;
            cin >> v >> c;
            g[i][v] = c;
        }
    }
    auto cost = dijkstra(n, g, 0);
    rep(i, n)
    {
        cout << i << " " << cost[i] << endl;
    }
    return 0;
}

C++: #include <cmath>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <climits>
#include <map>
#include <list>
#include <stack>
#include <queue>
#include <vector>
#include <string>
#include <sstream>
#include <fstream>
#include <iostream>
#include <algorithm>
using namespace std;

struct node {
	short id;
	long cost;
	node(short i, long c){
		this->id = i;
		this->cost = c;
	}
	bool operator<(node c) const {
		return this->cost > c.cost;
	}
};

int main() {
	int n;
	scanf("%d", &n);
	
	int c[n];
	int w[n][n];
	for(int i = 0; i < n; i++){
		int u, k;
		scanf("%d %d", &u, &k);
		
		c[u] = u ? LONG_MAX : 0;
		for(int j = 0; j < n; j++){
			w[u][j] = -1;
		}
		while(k--){
			int v, c;
			scanf("%d %d", &v, &c);
			w[u][v] = w[v][u] = c;
		}
	}
	
	priority_queue<node> q;
	q.push(*new node(0, 0));
	while(q.size()){
		int i = q.top().id;
		int ca = q.top().cost;
		q.pop();
		
		for(int j = 0; j < n; j++){
			if(w[i][j] != -1 && c[j] > w[i][j] + ca){
				c[j] = w[i][j] + ca;
				q.push(*new node(j, c[j]));
			}
		}
	}
	
	for(int i = 0; i < n; i++){
		printf("%d %d\n", i, c[i]);
	}
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <stack>
#include <climits>
#include <map>
#include <set>

using namespace std;

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

const ll mod = 1000000007;
const int inf = 1e9;
const long long INF = 1LL << 60;

const int MAX_N = 105;
int g[MAX_N][MAX_N];
int d[MAX_N];
bool used[MAX_N];
int n;

void dijkstra(int s){
    fill(d,d+n,inf);
    fill(used,used+n,false);
    d[s] = 0;

    while(true){
        int v = -1;
        for(int u = 0; u < n; u++){
            if(!used[u] && (v == -1 || d[u] < d[v])){
                // 1番最小のd[u]となるuを、v = u　として保存
                // ループを抜けた後に、vを介して[u]を更新
                v = u;
            }
        }
        //　この時点でd[u]が最小となるuは決定されている。
        if(v == -1) break;
        used[v] = true;
        for(int u = 0; u < n; u++){
            d[u] = min(d[u],d[v] + g[v][u]);
        }
    }
}

int main()
{
    cin >> 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;cin >> u >> k;
        for(int j = 0; j < k ;j++){
            int v,c; cin >> v >> c;
            g[u][v] = c;
        }
    }
    dijkstra(0);
    for(int i = 0; i < n; i++){
        cout << i << ' ' << d[i] << endl;
    }
}