Go: package main

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

const BIG_COST = 200000

const (
	ST_NOT_YET = iota
	ST_JOINED
)

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

	nNodes := scanInt(sc)

	costs := make([][]int, nNodes)
	graph := make([][]int, nNodes)

	states := make([]int, nNodes)
	costSums := make([]int, nNodes)

	for i := 0; i < nNodes; i++ {
		costs[i] = make([]int, nNodes)
		costSums[i] = BIG_COST
	}

	for i := 0; i < nNodes; i++ {
		u := scanInt(sc)
		k := scanInt(sc)
		graph[u] = make([]int, k)
		for d := 0; d < k; d++ {
			v := scanInt(sc)
			graph[u][d] = v
			costs[u][v] = scanInt(sc)
		}
	}

	costSums[0] = 0
	for {
		minCost := BIG_COST
		var u int

		for i, cost := range costSums {
			if states[i] != ST_JOINED && cost < minCost {
				minCost = cost
				u = i
			}
		}

		if minCost == BIG_COST {
			break
		}

		states[u] = ST_JOINED

		for _, v := range graph[u] {
			cost := minCost + costs[u][v]
			if cost < costSums[v] {
				costSums[v] = cost
			}
		}
	}

	w := bufio.NewWriter(os.Stdout)
	for i, cost := range costSums {
		fmt.Fprintf(w, "%d %d\n", i, cost)
	}
	w.Flush()
}

func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	v, _ := strconv.Atoi(sc.Text())
	return v
}

C++: #include <iostream>
#include <vector>
#include <utility>
#include <string>
#include <cmath>
#include <algorithm>
#include <string>
#include <iomanip>
#include <cstdio>
#include <queue>

using namespace std;
using ll = long long;
using ull = unsigned long long;

constexpr ll LL_MAX = numeric_limits<ll>::max();
constexpr ull ULL_MAX = numeric_limits<ull>::max();
constexpr ll I_MAX = numeric_limits<int>::max();
constexpr ull UI_MAX = numeric_limits<unsigned int>::max();

#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a-1;i>=b;i--)

auto sumdig(ll num) {
	ll dig, sum;
	sum = 0;
	while (num) {
		dig = num % 10;
		sum = sum + dig;
		num = num / 10;
	}
	return sum;
}



struct edge {
	int from;
	int to;
	int cost=1;
};


auto dijkstra(vector<vector<edge>> &g, int start = 0) {
	vector<int> d(g.size(), I_MAX);
	vector<bool> flag(g.size(), false);
	d[start] = 0;
	priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int,int>>> nodes;//first dist, second edgenum
	nodes.push(pair<int, int>(0, start));


	while (!nodes.empty()) {
		pair<int, int> n = nodes.top();
		int s_node = n.second;
		nodes.pop();
		if (n.first > d[n.second])continue;
		rep(i, 0, g[s_node].size()) {
			int new_dist = d[s_node] + g[s_node][i].cost;
			int n_num = g[s_node][i].to;
			if (new_dist < d[n_num]) {
				nodes.push(make_pair(new_dist, n_num));
				d[n_num] = new_dist;
			}
		}
	}
	return d;
}

int main() {
	int n;
	cin >> n;
	vector<edge> empty;
	vector<vector<edge>> g(n, empty);
	vector<int> ans;
	
	rep(i, 0, n) {
		int temp;
		cin >> temp;//頂点番号はいらん
		cin >> temp;

		rep(j, 0, temp) {
			int tc, tt;
			cin >> tt >> tc;
			edge tn = { i,tt,tc };
			g[i].push_back(tn);
		}
	}

	ans = dijkstra(g, 0);
	
	rep(i, 0, ans.size()) {
		cout << i << " " << ans[i] << endl;
	}

	return 0;
}

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

static const int MAX = 100;
static const int INFTY = (1<<21);

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

void dijkstra(){
  int minv;

  for(int i = 0; i < n; i++){
    d[i] = INFTY;
    color[i] = 0;
  }

  d[0] = 0;
  color[0] = 1;
  while(1){
    minv = INFTY;
    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(int v = 0; v < n; v++){
      if(M[u][v] != INFTY && color[v] != 2){
        if(d[u] + M[u][v] < d[v]){
          d[v] = d[u] + M[u][v];
          color[v] = 1;
        }
      } 
    }
  }
}

int main(){
  cin >> n;
  for(int i = 0; i < n; i++){
    for(int j = 0; j < n; j++){
      M[i][j] = INFTY;
    }
  }

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

  dijkstra();
  for(int i  = 0; i < n; i++){
    cout << i << " " << d[i] << endl;
  }

  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)   FOR(i,0,n)
#define MOD 1000000007

typedef long long int ll;

//const ll INF=(ll)1e18;
const int INF=(1<<21);

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

  vector<pair<int, int>> e[n];
  priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int,int>>> pq;

  int d[n];
  bool visited[n];

  REP(i,n)d[i]=INF;
  REP(i,n)visited[i]=false;

  REP(i,n){
    int u,k;
    cin >> u >> k;

    REP(j,k){
      int v,c;
      cin >> v >> c;;
      e[i].push_back(make_pair(v,c));
    }
  }

  d[0]=0;
  visited[0]=true;

  pq.push(make_pair(0,0));
  while(!pq.empty()){
    int c=pq.top().first;
    int u=pq.top().second;
    pq.pop();

    visited[u] = true;
    if(d[u] < c)continue;

    REP(i,e[u].size()){
      int v = e[u][i].first;
      if(visited[v])continue;

      if(d[u] + e[u][i].second < d[v]){
        d[v] = d[u] + e[u][i].second;
        pq.push(make_pair(d[v], v));
      }
    }

  }

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


}

C++: #include<bits/stdc++.h>
using namespace std;
#define M 1000000007
#define ff first.first
#define fs first.second
#define sf second.first
#define ss second.second
typedef pair<int,int> P;
typedef pair<P,P> PP;
int main(void)
{
	int i,j,k,u,n,flg[10001],v,c,sum,ky[10001],t,min,g;
	PP ke[10001];
	scanf("%d",&n);
	sum=0;
	for(i=0;i<n;i++) ky[i]=M,flg[i]=0;
	ky[0]=0;
	for(i=0;i<n;i++){
		scanf("%d%d",&u,&k);
		for(j=sum;j<k+sum;j++){
			scanf("%d%d",&v,&c);
			ke[j].ff=u , ke[j].fs=v , ke[j].sf=c;
		}
		sum+=k;
	}
	sort(ke,ke+sum);
	//for(i=0;i<sum;i++) printf("ke[%d].ff=%d ke[%d].fs=%d ke[%d].sf=%d\n",i,ke[i].ff,i,ke[i].fs,i,ke[i].sf);
	for(i=0;i<sum;i++){
		min=M;
		for(j=0;j<sum;j++) if(flg[j]==0&&min>ky[j]) g=j,min=j;
		flg[g]=1;
		if(min==M) break;
		for(j=0;j<sum;j++){
			t=ky[ke[j].ff]+ke[j].sf;
			if(ky[ke[j].fs]>t) g=j,ky[ke[j].fs]=t;
		}
	}
	for(i=0;i<n;i++) printf("%d %d\n",i,ky[i]);
	return 0;
}