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<stdio.h>
#include<algorithm>
#define  INF  1e9 
using namespace std;
typedef long long ll;
ll q[210][210];
int  p[210];
ll  dis[210];

void Dijkstra(int N){
	fill(dis,dis+210,INF);
	dis[0]=0;
	int x=0;
	while(p[N-1]==0){
		ll mini=INF;
		p[x]=1;
		for(int y=0;y<N;y++){
			if(p[y]==1)  continue;
			dis[y]=min(dis[y],dis[x]+q[x][y]);
		}
		for(int i=0;i<N;i++){
			if(p[i]==1) continue;
			if(mini>dis[i]){
				mini=dis[i];
				x=i;
			}
		}
	}
}
 
int main()
{
    int u,N,k,v;
	ll C;
	while(~scanf("%d",&N))
	{
		fill(q[0],q[0]+210*210,INF);
		fill(p,p+210,0);
		int M=N;
		while(N--)
		{
		    scanf("%d%d%",&u,&k);
		    for(int i=0;i<k;i++){
		    	scanf("%d%lld",&v,&C);
                q[u][v]=min(q[u][v],C);
			}
		}
		Dijkstra(M);
		for(int i=0;i<M;i++){
			printf("%d %lld\n",i,dis[i]);
		}
	}
	return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cassert>
#include <string>
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <algorithm>

using namespace std;

// ---------------------
// repetition
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)

// debug
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;

// ---------------------
#define INF (1 << 21)
typedef long long ll;

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

  vector<int> V[n];
  int E[n][n];
  int d[n];
  int visited[n];

  REP(x, n) {
    REP(y, n) {
      E[x][y] = INF;
    }
    d[x] = INF;
    visited[x] = 0;
  }

  REP(_, n) {
    int u, k;
    cin >> u >> k;
    REP(__, k) {
      int v, c;
      cin >> v >> c;
      V[u].push_back(v);
      E[u][v] = c;
      E[v][u] = c;
    }
  }

  d[0] = 0;
  REP(_, n) {
    int minv = -1;
    int mincost = INF;
    REP(v, n) {
      if (!visited[v] && d[v] < mincost) {
        minv = v;
        mincost = d[v];
      }
    }
    visited[minv] = 1;
    for (auto it = V[minv].begin(); it != V[minv].end(); it++) {
      if (E[minv][*it] < INF && d[minv] + E[minv][*it] < d[*it]) {
        d[*it] = d[minv] + E[minv][*it];
      }
    }
  }

  REP(i, n) {
    cout << i << " " << d[i] << endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, start, n) for (int i = (int)(start); i < (int)(n); ++i)
static const int INFTY = (1 << 30);
int n;
void search(vector<vector<int> > &G1, vector<vector<int> > &G2, int *d, bool *v)
{
    int mini, minv;
    while (1)
    {
        bool iscomp = true;
        minv = INFTY;
        rep(i, 0, n)
        {
            if (!v[i] && d[i] < minv)
            {
                mini = i;
                minv = d[i];
                iscomp = false;
            }
        }
        if (iscomp)
            break;
        v[mini] = true;
        rep(i, 0, G1[mini].size())
        {
            int tmp = G1[mini][i];
            if (!v[tmp])
            {
                int tmptime = minv + G2[mini][i];
                if (tmptime < d[tmp])
                    d[tmp] = tmptime;
            }
        }
    }
}
int main()
{
    cin >> n;
    vector<vector<int> > G1(n, vector<int>(0)), G2(n, vector<int>(0));
    int d[n];
    bool v[n] = {};
    rep(i, 0, n) d[i] = INFTY;
    int utmp, ktmp, vtmp, ctmp;
    rep(i, 0, n)
    {
        cin >> utmp >> ktmp;
        rep(j, 0, ktmp)
        {
            cin >> vtmp >> ctmp;
            G1[utmp].push_back(vtmp);
            G2[utmp].push_back(ctmp);
        }
    }
    d[0] = 0;
    search(G1, G2, d, v);
    rep(i, 0, n)
    {
        printf("%d %d\n", i, d[i]);
    }
}

C++: #include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const int INF = (1 << 30) - 1;
const ll INF64 = ((ll)1 << 62) - 1;
const double PI = 3.1415926535897932384626433832795;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	int n;
	cin >> n;

	vector<vector<pair<int, int>>> m(n);

	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;
			m[u].emplace_back(v, c);
		}
	}

	vector<int> d(n, INF), color(n);

	d[0] = 0;
	color[0] = 1;
	while (true) {
		int minv = INF;
		int u = -1;
		for (int i = 0; i < n; i++) {
			if (minv > d[i] && color[i] != 2) {
				u = i;
				minv = d[i];
			}
		}

		if (u == -1) {
			break;
		}

		color[u] = 2;
		for (auto e : m[u]) {
			if (color[e.first] != 2 && d[e.first] > d[u] + e.second) {
				d[e.first] = d[u] + e.second;
				color[e.first] = 1;
			}
		}
	}

	for (int i = 0; i < n; i++) {
		cout << i << " " << (d[i] == INF ? -1 : d[i]) << endl;
	}
	return 0;
}