Go: package main

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

// I/O
type Scanner struct {
	sc *bufio.Scanner
}

func NewScanner() *Scanner {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Buffer(make([]byte, 1024), int(1e+9))
	return &Scanner{sc}
}

func (s *Scanner) nextStr() string {
	s.sc.Scan()
	return s.sc.Text()
}

func (s *Scanner) nextInt() int {
	i, e := strconv.Atoi(s.nextStr())
	if e != nil {
		panic(e)
	}
	return i
}

func (s *Scanner) nextFloat() float64 {
	f, e := strconv.ParseFloat(s.nextStr(), 64)
	if e != nil {
		panic(e)
	}
	return f
}

func (s *Scanner) nextRuneSlice() []rune {
	return []rune(s.nextStr())
}

func (s *Scanner) nextIntSlice(n int) []int {
	res := make([]int, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextInt()
	}
	return res
}

func (s *Scanner) nextFloatSlice(n int) []float64 {
	res := make([]float64, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextFloat()
	}
	return res
}

// Arithmetic
func max(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m < i {
			m = i
		}
	}
	return m
}

func min(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m > i {
			m = i
		}
	}
	return m
}

func abs(x int) int {
	if x > 0 {
		return x
	}
	return -x
}

func pow(x, y int) int {
	res := 1
	for i := 0; i < y; i++ {
		res *= x
	}
	return res
}

func ceil(a, b int) int {
	if a%b == 0 {
		return a / b
	} else {
		return a/b + 1
	}
}

// Sort
type RuneSlice []rune

func (a RuneSlice) Len() int           { return len(a) }
func (a RuneSlice) Less(i, j int) bool { return a[i] < a[j] }
func (a RuneSlice) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

// Main
type Node struct {
	cost int
	done bool
}

type Edge struct {
	to, cost int
}

const INF = 1 << 60

func main() {
	sc := NewScanner()
	wtr := bufio.NewWriter(os.Stdout)
	N := sc.nextInt()
	nodes := make([]Node, N)
	for i := 0; i < N; i++ {
		nodes[i].cost = INF
	}
	E := make([][]Edge, N)
	for i := 0; i < N; i++ {
		id, k := sc.nextInt(), sc.nextInt()
		for j := 0; j < k; j++ {
			to, cost := sc.nextInt(), sc.nextInt()
			E[id] = append(E[id], Edge{to, cost})
		}
	}
	nodes[0].cost = 0
	for {
		cur := 0
		minCost := INF
		for i := 0; i < N; i++ {
			n := nodes[i]
			if !n.done && n.cost < minCost {
				cur = i
				minCost = n.cost
			}
		}
		if minCost == INF {
			break
		}
		nodes[cur].done = true
		for i := 0; i < len(E[cur]); i++ {
			to, cost := E[cur][i].to, E[cur][i].cost+nodes[cur].cost
			if !nodes[to].done && cost < nodes[to].cost {
				nodes[to].cost = cost
			}
		}
	}

	for i := 0; i < N; i++ {
		fmt.Fprintln(wtr, i, nodes[i].cost)
	}
	wtr.Flush()
}

Python: import heapq


class ShortestPath:
    """Dijkstra's algorithm : find the shortest path from a vertex
       Complexity: O(E + log(V))
       used in GRL1A(AOJ)
    """

    def __init__(self, V, E, start, INF=10**9):
        """ V: the number of vertexes
            E: adjacency list (all edge in E must be 0 or positive)
            start: start vertex
            INF: Infinity distance
        """
        self.V = V
        self.E = E
        self.dijkstra(start, INF)

    def dijkstra(self, start, INF):
        que = list()
        self.distance = [INF] * self.V  # distance from start
        self.prev = [-1] * self.V  # prev vertex of shortest path
        self.distance[start] = 0
        heapq.heappush(que, (0, start))

        while len(que) > 0:
            dist, fr = heapq.heappop(que)
            if self.distance[fr] < dist:
                continue
            for to, cost in self.E[fr]:
                if self.distance[fr] + cost < self.distance[to]:
                    self.distance[to] = self.distance[fr] + cost
                    heapq.heappush(que, (self.distance[to], to))
                    self.prev[to] = fr

    def getPath(self, end):
        path = [end]
        while self.prev[end] != -1:
            end = self.prev[end]
        return path[::-1]
V = int(input())
edge = [[] for _ in range(V)]
for _ in range(V):
    u, _, *e = map(int, input().split())
    for t, d in zip(e[::2], e[1::2]):
        edge[u].append((t, d))

sp = ShortestPath(V, edge, 0)
for i, d in enumerate(sp.distance):
    print(i, d)

Python: from heapq import heappush, heappop, heappushpop, heapreplace, heapify

#隣接リスト作成
v = int(input())
edge_list = [[] for _ in range(v)]
for i in range(v):
    l = list(map(int, input().split()))
    for j in range(1,l[1]+1):
        edge_list[l[0]].append([l[2*j+1],l[2*j]])

def dijkstra(v, edges, start):
    d = [float("inf")] * v
    visited = [False] * v
    d[start] = 0
    visited[start] = 0
    hq = []
    for i in edges[start]:
        d[i[1]] = i[0]
        heappush(hq, i)

    while hq:
        x, y = heappop(hq)
        #もし更新する必要がないならこれ以降の処理を行わない
        if d[y] < x:
            continue
        d[y] = x
        visited[y] = True
        for n in edges[y]:
            if not visited[n[1]]:
                hq.append([x + n[0], n[1]])
        heapify(hq)
    return d

for index, d in enumerate(dijkstra(v, edge_list,0)):
    print(index,d)

Python: WHITE = 0
GRAY = 1
BLACK = 2
INFTY = 10**13
def dijkstra(s):
    color = [WHITE for i in range(N)]
    d = [INFTY for i in range(N)]
    p = [-1 for i in range(N)]
    d[s] = 0

    while True:
        mincost = INFTY
        for i in range(N):
            if color[i] != BLACK and d[i] < mincost:
                mincost = d[i]
                u = i
        if mincost == INFTY:
            break
        
        color[u] = BLACK

        for v in range(N):
            if color[v] != BLACK and M[u][v] != -1:
                if d[u] + M[u][v] < d[v]:
                    d[v] = d[u] + M[u][v]
                    p[v] = u
                    color[v] = GRAY
    return d

N = int(input())
M = [[-1 for j in range(N)] for i in range(N)]
for i in range(N):
    ukvc = list(map(int, input().split()))
    u, k, vc = ukvc[0], ukvc[1], ukvc[2:]
    for v, c in zip(vc[0::2], vc[1::2]):
        M[u][v] = c

d = dijkstra(0)

for i in range(N):
    print(i, d[i])

Python: import sys
def dijkstra(n, a):
	v = [False]*n
	v[0] = True
	w = [sys.maxsize] * n
	w[0] = 0
	while True:
		m = -1
		mini = sys.maxsize
		for i in range(n):
			for j in range(n):
				c = a[i][j]
				if v[i] and not v[j] and c != 0:
					w[j] = min(w[j], w[i]+c)
					if mini > w[j]:
						mini = w[j]
						m = j
		if m == -1: break
		v[m] = True
	
	for i in range(n):
		print(str(i) + ' ' + str(w[i]))

n = int(input())
a = [[0 for x in range(n)] for x in range(n)]
for i in range(n):
	t = list(map(int,input().split()))
	u = t[0]
	k = t[1]
	for j in range(k):
		v = t[(j*2)+2]
		c = t[(j*2)+3]
		a[u][v] = c
dijkstra(n, a)