Go: package main

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

const MAX = 100
const INFTY = math.MaxInt64
const WHITE = 0
const GRAY = 1
const BLACK = 2

var n int
var M [MAX][MAX]int

func dijkstra() {
	var minv int
	var d [MAX]int
	var color [MAX]int

	for i := 0; i < n; i++ {
		d[i] = INFTY
		color[i] = WHITE
	}

	d[0] = 0
	color[0] = GRAY
	for {

		minv = INFTY
		u := -1
		for i := 0; i < n; i++ {
			if minv > d[i] && color[i] != BLACK {
				u = i
				minv = d[i]
			}
		}
		if u == -1 {
			break
		}

		color[u] = BLACK

		for v := 0; v < n; v++ {
			if color[v] != BLACK && M[u][v] != INFTY {
				if d[v] > d[u]+M[u][v] {
					d[v] = d[u] + M[u][v]
					color[v] = GRAY
				}
			}
		}

	}
	for i := 0; i < n; i++ {
		fmt.Printf("%v %v\n", i, d[i])
	}
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Scan()
	n, _ = strconv.Atoi(sc.Text())

	for i := 0; i < n; i++ {
		for j := 0; j < n; j++ {
			M[i][j] = INFTY
		}
	}

	for i := 0; i < n; i++ {
		sc.Scan()
		f, _ := strconv.Atoi(sc.Text())
		sc.Scan()
		k, _ := strconv.Atoi(sc.Text())
		for j := 0; j < k; j++ {
			sc.Scan()
			v, _ := strconv.Atoi(sc.Text())
			sc.Scan()
			c, _ := strconv.Atoi(sc.Text())
			M[f][v] = c
		}
	}
	dijkstra()
}

Python: n = int(input())
a = []
for i in range(n):
    b = list(map(int, input().split()))
    c = [-1] * n
    for j in range(b[1]):
        c[b[2 + j * 2]] = b[3 + j * 2]
    a.append(c)

m = [float('inf')] * n
f = [0] * n
m[0] = 0
f[0] = 1
v = 0

for i in range(n-1) :
    for j in range(n) :
        if (a[v][j] + m[v] < m[j]) & (f[j] == 0) & (a[v][j] != -1):
            m[j] = a[v][j] + m[v]
    
    min = 2001
    minj = 0
    for j in range(n) :
        if (m[j] < min) & (f[j] == 0):
            min = m[j]
            minj = j
    
    v = minj
    f[minj] = 1

[print(i, m[i]) for i in range(n)]

Python: from collections import deque
import sys
import heapq
n = int(input())
V = [[int(i) for i in input().split()] for _ in range(n)]
dis = [sys.maxsize for _ in range(n)]
dis[0] = 0
h = []
for i in range(n):
    heapq.heappush(h,(dis[i],i))
while(len(h)>0):
    node = heapq.heappop(h)
    tmp = node[1]
    for i in range(V[tmp][1]):
        ind = V[tmp][2*i+2]
        cos = V[tmp][2*i+3]
        if cos + dis[tmp] < dis[ind]:
            dis[ind] = cos + dis[tmp]
            heapq.heappush(h,(dis[ind],ind))
for i,j in enumerate(dis):
    print(i,j)

Python: import heapq

def main():

    INF = 1000000009
    n = int(input())
    e = [[] for _ in range(n)]
    for i in range(n):
        inf = list(map(int,input().split()))
        for j in range((inf[1])):
            e[inf[0]].append([inf[2+j*2],inf[2+j*2+1]])
    
    dp = [INF]*n
    dp[0] = 0
    pq = [[0,0]]
    heapq.heapify(pq)
    while pq:
        cost,v = heapq.heappop(pq)
        if dp[v]<cost:continue

        for i in range(len(e[v])):
            u = e[v][i][0]
            ncost = cost+e[v][i][1]
            if ncost < dp[u]:
                dp[u] = ncost
                heapq.heappush(pq,[ncost,u])
    for i in range(n):
        print(i,dp[i])


if __name__ == '__main__':
    main()

Python: n = int(raw_input())
G = [[-1] * n] * n
d = [0] * n
 
for i in range(n):
    v = map(int, raw_input().split())
    for j in range(v[1]):
        G[v[0]][v[2+2*j]] = int(v[3+2*j])
 
flag = [0] * n
tn = [1]
r = 0
while True:
    for i in range(n):
        if flag[i] == 0 and i in tn:
            flag[i] = 1
            d[i] = r
            for j in range(n):
                if G[i][j] != -1 and flag[j] == 0:
                    tn.append(j)
    if len(tn) == n:
        break
    r += 1
 
for i in range(1, n+1):
    print(str(i) + " " + str(d[i]))

Python: n = int(input())
data = [list(map(int, input().split())) for _ in range(n)]
INF = 10000000000000000000
M = [[-1]*n for _ in range(n)]
for i in data:
    for j in range(i[1]):
        M[i[0]][i[2+j*2]] = i[3+j*2]
color = ['White']*n
d = [INF]*n
p = [None]*n

d[0] = 0
p[0] = -1

while True:
    minct = INF
    for i in range(n):
        if color[i] != 'Black' and d[i] < minct:
            minct = d[i]
            u = i
    if minct == INF:
        break
    color[u] = 'Black'
    for j in range(n):
        if color[j] != 'Black' and M[u][j] != -1:
            if d[u] + M[u][j] < d[j]:
                d[j] = d[u] + M[u][j]
                p[j] = u
                color[j] = 'Gray'
for i in range(n):
    print('{} {}'.format(i, d[i]))

Python: #coding:utf-8

inf = 1000000
n = int(input())
M = [[inf for i in range(n)] for j in range(n)]

for i in range(n):
    data = list(map(int,input().split()))
    u = data[0]
    k = data[1]
    for j in range(0,2*k,2):
        v, w = data[j+2], data[j+3]
        M[u][v] = w

def dijkstra(s):
    color = ["white" for i in range(n)]
    d = [inf for i in range(n)]
    p = [-1 for i in range(n)]
    d[s] = 0
    while True:
        mincost = inf
        for i in range(n):
            if color[i] != "black" and d[i] < mincost:
                mincost = d[i]
                u = i
        if mincost == inf:
            break
        color[u] = "black"

        for v in range(n):
            if color[v] != "black" and M[u][v] != inf:
                if d[u] + M[u][v] < d[v]:
                    d[v] = d[u] + M[u][v]
                    p[v] = u
                    color[v] = "gray"
    return d

dList = dijkstra(0)
for i, d in enumerate(dList):
    print(i,d)

Python: import sys
readline = sys.stdin.readline
write = sys.stdout.write

N = int(readline())

G = [None]*N
W = 0
for i in range(N):
    j, k, *V = map(int, readline().split())
    G[i] = [(v, c) for v, c in zip(V[::2], V[1::2])]
    if V:
        W = max(W, max(V[1::2]))

def dial(N, G, W, s):
    B = [-1]*(N*W + 1)
    L = [-1]*(N*W + 1)
    *prv, = range(-1, N-1)
    *nxt, = range(1, N+1)
    nxt[-1] = -1
    prv[s+1] = s-1
    nxt[s-1] = (s+1 if s < N-1 else -1)
    prv[s] = nxt[s] = -1
    B[0] = L[0] = s
    B[N*W] = +(s == 0)
    L[N*W] = (N-1 if s < N-1 else N-2)

    dist = [N*W] * N
    dist[s] = 0
    for w in range(N*W):
        v = B[w]
        while v != -1:
            for x, c in G[v]:
                e = w + c
                if e < dist[x]:
                    d = dist[x]
                    dist[x] = e

                    p = prv[x]; n = nxt[x]
                    if p != -1:
                        nxt[p] = n
                    else:
                        B[d] = n
                    if n != -1:
                        prv[n] = p
                    else:
                        L[d] = p

                    l = L[e]
                    if l != -1:
                        nxt[l] = x
                    else:
                        B[e] = x
                    prv[x] = l; nxt[x] = -1
                    L[e] = x
            v = nxt[v]
    return dist
dist = dial(N, G, W, 0)
ans = []
for i in range(N):
    ans.append("%d %d\n" % (i, dist[i]))
sys.stdout.writelines(ans)