Harryxun/testdata huggingface dataset:
Buggy python submission (verdict: Runtime Error):
import math
a, b = map(int, input().split())
ans = math.floor(a * b)
print(ans)


Fixed submission:
#import math
from decimal import *
# 小数を制御

a, b = map(str, input().split())
a = int(a)
b = Decimal(b)
#ans = math.floor(a * b)
ans = a * b
ans1 = int(ans)
print(ans1)
Buggy python submission (verdict: Runtime Error):
A, B = map(int.input().split())

if (A > B):
    print('safe')
else:
    print('unsafe')


Fixed submission:
A, B = map(int, input().split())

if (A > B):
    print('safe')
else:
    print('unsafe')
Buggy python submission (verdict: Runtime Error):
r = input()

ans = 2*r*3.141
print(ans)

Fixed submission:
import math

r = int(input())
ans = math.pi*(2*r)
print(ans)
Buggy python submission (verdict: Runtime Error):
N, M = map(int, input().split())

height = [input() for i in range(M)]
sum = N - sum(height)

if (sum >= 0):
    print(sum)
else:
    print('-1')


Fixed submission:
import numpy as np
N, M = map(int, input().split())
data = np.array(input().split(), dtype=np.int64)

#height = [int(input()) for _ in range(M)]
sum = N - np.sum(data)

if (sum >= 0):
    print(sum)
else:
    print('-1')
Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())

#data = np.array(input().split(), dtype=np.int64)


def read(): return list(map(int, input().split()))


data = read()

#count = collections.Counter(data)

for i in range(1, N+1):
    ans = data.count(i)
    print(ans)


Fixed submission:
from collections import Counter

N = int(input())
data = list(map(int, input().split()))

count = Counter(data)

for i in range(1, N+1):
    ans = count[i]
    print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())

#data = np.array(input().split(), dtype=np.int64)


def read(): return list(map(int, input().split()))
data = read()

#count = collections.Counter(data)

for i in range(1, N+1):
    ans = data.count(i)
    print(ans)


Fixed submission:
from collections import Counter

N = int(input())
data = list(map(int, input().split()))

count = Counter(data)

for i in range(1, N+1):
    ans = count[i]
    print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
'''
data = np.array(input().split(), dtype=np.int64)
'''
def read(): return list(map(int, input().split()))
data = read()

for i in range(1,N+1):
  ans = data.count(i)
  print(ans)

Fixed submission:
from collections import Counter

N = int(input())
data = list(map(int, input().split()))

count = Counter(data)

for i in range(1, N+1):
    ans = count[i]
    print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
'''
data = np.array(input().split(), dtype=np.int64)
'''
def read(): return list(map(int, input().split()))
data = read()

for i in range(1,N+1):
  ans = data.count(i)
  print(ans)

Fixed submission:
from collections import Counter

N = int(input())
data = list(map(int, input().split()))

count = Counter(data)

for i in range(1, N+1):
    ans = count[i]
    print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
N = int(input())
data = np.array(input().split(), dtype=np.int64)

for i in range(1,N+1):
  ans = np.count_nonzero(data == i)
  print(ans)

Fixed submission:
from collections import Counter

N = int(input())
data = list(map(int, input().split()))

count = Counter(data)

for i in range(1, N+1):
    ans = count[i]
    print(ans)
Buggy python submission (verdict: Runtime Error):
N, K = map(int, input().split())
# 今回は、等差数列の和の差をとって、


def calc(x):
    a = x * (x - 1) // 2
    b = (2 N - x + 1) * x // 2
    return a - b + 1


for i in range(K, N + 2):
    ans = calc(i)
    tot = +=ans

tot /= 10 ** 9 + 7

print(tot)


Fixed submission:
N, K = map(int, input().split())
# 小さい方から順にk個とったものと、大きい方から順にk個とったものの差
# １刻みから作る最小と最大間は、全てを満たす


def calc(x, N):
    a = x * (x - 1) // 2
    b = (2 * N - x + 1) * x // 2
    return b - a + 1


tot = 0
for i in range(K, N + 2):
    ans = calc(i, N)
 #   print(ans)
    tot += ans

aa = tot % (10 ** 9 + 7)

print(aa)
Buggy python submission (verdict: Time Limit Exceeded):
from collections import Counter
#from scipy.special import comb
# a = comb(n, r)
# >> cannot use in Contest (like AtCoder)


def cmb(n, r):
    if n - r < r:
        r = n - r
    if r == 0:
        return 1
    if r == 1:
        return n
    if n <= 1:
        return 0

    numerator = [n - r + k + 1 for k in range(r)]
    denominator = [k + 1 for k in range(r)]

    for p in range(2, r+1):
        pivot = denominator[p - 1]
        if pivot > 1:
            offset = (n - r) % p
            for k in range(p-1, r, p):
                numerator[k - offset] /= pivot
                denominator[k] /= pivot

    result = 1
    for k in range(r):
        if numerator[k] > 1:
            result *= int(numerator[k])

    return result


N = int(input())
data = list(map(int, input().split()))
count = Counter(data)
#print(count) > Counter({1: 4, 2: 2, 4: 2})
countMost = count.most_common()

lis = [0] * (2 * 10 ** 5)
tot = 0
for i, v in countMost:
    #print(i, v)
    lis[i - 1] = v
    tot += cmb(v, 2)
#print('TOT', tot)
# print(lis[0])
for i, v in enumerate(data):
    num = lis[v - 1]
    if (num == 2):
        #    print('a')
        ans = tot - 1
    else:
        ans = tot - cmb(num, 2) + cmb(num-1, 2)

    print(ans)
'''
dataSort = data.sort()
print(countMost)
print(len(countMost))
'''


Fixed submission:
from collections import Counter
#from scipy.special import comb
# a = comb(n, r)
# >> cannot use in Contest (like AtCoder)


def cmb(n, r):
    if n - r < r:
        r = n - r
    if r == 0:
        return 1
    if r == 1:
        return n
    if n <= 1:
        return 0

    numerator = [n - r + k + 1 for k in range(r)]
    denominator = [k + 1 for k in range(r)]

    for p in range(2, r+1):
        pivot = denominator[p - 1]
        if pivot > 1:
            offset = (n - r) % p
            for k in range(p-1, r, p):
                numerator[k - offset] /= pivot
                denominator[k] /= pivot

    result = 1
    for k in range(r):
        if numerator[k] > 1:
            result *= int(numerator[k])

    return result


N = int(input())
data = list(map(int, input().split()))
count = Counter(data)
#print(count) > Counter({1: 4, 2: 2, 4: 2})
countMost = count.most_common()

lis = [0] * (2 * 10 ** 5)
combination = [0] * (2 * 10 ** 5)
tot = 0
for i, v in countMost:
    #print(i, v)
    lis[i - 1] = v
    val = cmb(v, 2)
    tot += val
    combination[i - 1] = val
#print('TOT', tot)
# print(lis[0])
for i, v in enumerate(data):
    num = lis[v - 1]
    if (num == 2):
        #    print('a')
        ans = tot - 1
    else:
        ans = tot - combination[v-1] + cmb(num-1, 2)

    print(ans)
'''
dataSort = data.sort()
print(countMost)
print(len(countMost))
'''
Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
# n: ketasuu
# m: num of list
data = [[0] * 2] * m
for i in range(m):
    a, b = map(int, input().split())
    # data[i][0], data[i][1] = a, b  >>>間違い
    data[i] = a, b
dataSort = sorted(data)
start = dataSort[0][0]
strVal = dataSort[0][1]

aList = ['1'] + ['0'] * (n - 1)

flag = True
for i in range(m):
    tar = dataSort[i][0]
    tarVal = dataSort[i][1]

    if (tar == 1 and tarVal == 0):
        # print('-1')
        ans = -1
        flag = False
        break
    if (tar == start):
        if (tarVal != strVal):
            ans = -1
            flag = False
            break

    else:
        start = tar
        strVal = tarVal

    aList[tar - 1] = str(tarVal)


if (flag == True):
    ans = ''.join(aList)

print(ans)


Fixed submission:
n, m = map(int, input().split())

temp = list(['?'] * n)

# print(temp)
if (m == 0):
    if (n == 1):
        ans = 0
    else:
        ans = '1' + '0' * (n - 1)

else:
    for _ in range(m):
        s, c = map(int, input().split())
        if (s == 1 and c == 0 and n >= 2):
            print(-1)
            exit()
        else:
            pass

        if (temp[s-1] == '?'):
            temp[s - 1] = str(c)
        elif (temp[s - 1] == str(c)):
            pass
        else:
            print(-1)
            exit()

    if (temp[0] == '?'):
        temp[0] = '1'

    ans01 = ''.join(temp)
    ans = ans01.replace('?', '0')

print(ans)

Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
# n: ketasuu
# m: num of list
data = [[0] * 2] * m
for i in range(m):
    a, b = map(int, input().split())
    # data[i][0], data[i][1] = a, b  >>>間違い
    data[i] = a, b
dataSort = sorted(data)
start = dataSort[0][0]
strVal = dataSort[0][1]

aList = [0, 0, 0]
flag = True
for i in range(m):
    tar = dataSort[i][0]
    tarVal = dataSort[i][1]

    if (tar == 1 and tarVal == 0):
        # print('-1')
        ans = -1
        flag = False
        break
    if (tar == start):
        if (tarVal != strVal):
            ans = -1
            flag = False
            break

    else:
        start = tar
        strVal = tarVal

    aList[tar - 1] = tarVal


if (flag == True):
    ans = str(aList[0]) + str(aList[1]) + str(aList[2])

print(ans)


Fixed submission:
n, m = map(int, input().split())

temp = list(['?'] * n)

# print(temp)
if (m == 0):
    if (n == 1):
        ans = 0
    else:
        ans = '1' + '0' * (n - 1)

else:
    for _ in range(m):
        s, c = map(int, input().split())
        if (s == 1 and c == 0 and n >= 2):
            print(-1)
            exit()
        else:
            pass

        if (temp[s-1] == '?'):
            temp[s - 1] = str(c)
        elif (temp[s - 1] == str(c)):
            pass
        else:
            print(-1)
            exit()

    if (temp[0] == '?'):
        temp[0] = '1'

    ans01 = ''.join(temp)
    ans = ans01.replace('?', '0')

print(ans)
Buggy python submission (verdict: Runtime Error):
a, b, c = map(int, input().split())
if (a==b) and (b!=c):
  print('Yes")
elif (b==c) and (c!=a):
  print('Yes")
elif (a==c) and (c!=b):
  print('Yes")
else:
  print('No')


Fixed submission:
a, b, c = map(int, input().split())
if (a==b) and (b!=c):
  print('Yes')
elif (b==c) and (c!=a):
  print('Yes')
elif (a==c) and (c!=b):
  print('Yes')
else:
  print('No')
Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
N=int(input())
PP=np.array(input().split(),dtype=np.int64)
P_list=PP.tolist()
index=P_list.index(1)
#print(index)
count=1
if (N==1):
    print(count)
else:
    for i in range(1,index+1):
        P1=PP[0:i+1]
        MIN=np.min(P1)
        TAR=P1[i]
        if (MIN==TAR):
            count += 1

    print(count)

Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

n = int(readline())
p = list(map(int, readline().split()))
temp = p[0]
lis = p[1:]
ans = 1

for i in lis:
    if (i > temp):
        pass
    else:
        temp = i
        ans += 1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
N=int(input())
PP=np.array(input().split(),dtype=np.int64)
count=1
if (N==1):
    print(count)
else:
    for i in range(1,N):
        P1=PP[0:i+1]
        MIN=np.min(P1)
        TAR=P1[i]
        if (MIN==TAR):
            count += 1

    print(count)

Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

n = int(readline())
p = list(map(int, readline().split()))
temp = p[0]
lis = p[1:]
ans = 1

for i in lis:
    if (i > temp):
        pass
    else:
        temp = i
        ans += 1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
N=int(input())
PP=np.array(input().split(),dtype=np.int64)
#print(PP[3])
count=1
if (N==1):
    print(count)
else:
    for i in range(1,N):
 #       print(i)
        P1=PP[0:i+1]
        #P1=np.array(P0)
        MIN=np.min(P1)

        TAR=P1[i]
        if (MIN==TAR):
            count += 1

    print(count)


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

n = int(readline())
p = list(map(int, readline().split()))
temp = p[0]
lis = p[1:]
ans = 1

for i in lis:
    if (i > temp):
        pass
    else:
        temp = i
        ans += 1

print(ans)
Buggy python submission (verdict: Runtime Error):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

n, m = map(int, readline().split())
#n, m = map(int, input().split())

acCount = 0
waCount = 0
check = [0] * n
waCheck = [0] * n

for i in range(m):
    p, s = map(str, input().split())
    # print(p,s)
    p = int(p)
    if (check[p - 1] == 0):
        if (s == 'WA'):
            waCheck[p - 1] += 1

        else:
            acCount += 1
            waCheck += waCheck[p - 1]

            check[p - 1] = 1
    else:
        continue

print(acCount, waCount)


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

n, m = map(int, readline().split())
#n, m = map(int, input().split())

acCount = 0
waCount = 0
check = [0] * n
waCheck = [0] * n

for i in range(m):
    p, s = map(str, input().split())
    # print(p,s)
    p = int(p)
    if (check[p - 1] == 0):
        if (s == 'WA'):
            waCheck[p - 1] += 1

        else:
            acCount += 1
            waCount += waCheck[p - 1]

            check[p - 1] = 1
    else:
        continue

print(acCount, waCount)
Buggy python submission (verdict: Time Limit Exceeded):
import math
from operator import mul
from functools import reduce

'''
def cmb(n, r):
    r = min(n-r, r)
    if r == 0:
        return 1
    over = reduce(mul, range(n, n - r, -1))
    under = reduce(mul, range(1, r + 1))
    return (over // under) % (10 ** 9 + 7)

>TLE
> 竸プロの、nCk mod. p 　パターン
>逆元を利用する。
'''


def comb(n, k, p):
    """power_funcを用いて(nCk) mod p を求める"""
    from math import factorial
    if n < 0 or k < 0 or n < k:
        return 0
    if n == 0 or k == 0:
        return 1
    a = factorial(n) % p
    b = factorial(k) % p
    c = factorial(n-k) % p
    return (a*power_func(b, p-2, p)*power_func(c, p-2, p)) % p


def power_func(a, b, p):
    """a^b mod p を求める"""
    if b == 0:
        return 1
    if b % 2 == 0:
        d = power_func(a, b//2, p)
        return d*d % p
    if b % 2 == 1:
        return (a*power_func(a, b-1, p)) % p


x, y = map(int, input().split())

diff = abs(x - y)
large = max(x, y)
small = min(x, y)

if (small * 2 < large):
    print(0)
    exit()


#ans = diff
large -= diff * 2
small -= diff

if (small % 3 != 0):
    print(0)
    exit()

else:
    num = small / 3
    nn = num * 2 + diff
    #rr = num
    ans = comb(int(nn), int(num), 10 ** 9 + 7)

    print(int(ans))


Fixed submission:
p = 10 ** 9 + 7
x, y = map(int, input().split())

diff = abs(x - y)
large = max(x, y)
small = min(x, y)

if (small * 2 < large):
    print(0)
    exit()


# ans = diff
large -= diff * 2
small -= diff

if (small % 3 != 0):
    print(0)
    exit()


num = int(small / 3)
nn = int(num * 2 + diff)
# rr = num

factorial = [0] * (nn + 1)
factorial[0] = 1
for i in range(nn):
    factorial[i + 1] = factorial[i] * (i + 1) % p


def cmb(n, k):
    # if (n == 1 or k == 1):
    if (n == 0 or k == 0):
        return 1
    if (n < 0 or k < 0):
        return 0

    return factorial[n] * pow(factorial[n - k], p - 2, p) * pow(factorial[k], p - 2, p) % p


ans = cmb(int(nn), int(num))
print(int(ans))
Buggy python submission (verdict: Runtime Error):
#import numpy as np
#import math
import heapq

n, m = map(int, input().split())
#a = list(map(int, input().split()))
a = list(map(lambda x: int(x) * (-1), input().split()))
heapq.heapify(a)  # aを優先度付きキューに

for _ in range(m):
    MAX = heapq.heappop(a)  # −１かけたリストのMin　＞Max
    heapq.heappush(a, (-1) * (-MAX // 2))
    print(a)

ans = (sum(a)) * (-1)  # そのままリストでOK
print(ans)

Fixed submission:
#import numpy as np
#import math
import heapq

n, m = map(int, input().split())
#a = list(map(int, input().split()))
a = list(map(lambda x: int(x) * (-1), input().split()))
heapq.heapify(a)  # aを優先度付きキューに

for _ in range(m):
    MAX = heapq.heappop(a)  # −１かけたリストのMin　＞Max
    heapq.heappush(a, (-1) * (-MAX // 2))

ans = (sum(a)) * (-1)  # そのままリストでOK
print(ans)

Buggy python submission (verdict: Runtime Error):
import numpy as np
import math
n, m = map(int, input().split())
#a = list(map(int, input().split()))
a = list(map(lambda x: int(x) * (-1), input().split()))
heapq.heapify(a)  # aを優先度付きキューに

for _ in range(m):
    MAX = heapq.heappop(a)  # −１かけたリストのMin　＞Max
    heapq.heappush(a, (-1) * (-MAX // 2))

ans = (sum(a)) * (-1)  # そのままリストでOK
print(ans)

Fixed submission:
#import numpy as np
#import math
import heapq

n, m = map(int, input().split())
#a = list(map(int, input().split()))
a = list(map(lambda x: int(x) * (-1), input().split()))
heapq.heapify(a)  # aを優先度付きキューに

for _ in range(m):
    MAX = heapq.heappop(a)  # −１かけたリストのMin　＞Max
    heapq.heappush(a, (-1) * (-MAX // 2))

ans = (sum(a)) * (-1)  # そのままリストでOK
print(ans)
Buggy python submission (verdict: Runtime Error):
N = int(input())
mons = list(map(int, input().split()))
yush = list(map(int, input().split()))

temp = sum(mons)

for i, yu in enumerate(yush):
    mo = mons[i]
    if (yu >= mo):
        mons[i] = 0
        yush[i] = yu - mo
        
        if (mons[i + 1] > yush[i]):
            mons[i + 1] -= yush[i]
        else:
            monx[i + 1] = 0
        
    else:
        mons[i] = mo - yu
        yush[i] = 0
ans = temp - sum(mons)
print(ans)

Fixed submission:
N = int(input())
mons = list(map(int, input().split()))
yush = list(map(int, input().split()))

temp = sum(mons)

for i, yu in enumerate(yush):
    mo = mons[i]
    if (yu >= mo):
        mons[i] = 0
        yush[i] = yu - mo
        
        if (mons[i + 1] > yush[i]):
            mons[i + 1] -= yush[i]
        else:
            mons[i + 1] = 0
        
    else:
        mons[i] = mo - yu
ans = temp - sum(mons)
print(ans)
Buggy python submission (verdict: Runtime Error):
n = int(input())
d = list(map(int, input().split()))
d = sorted(d)
tar = int(n/2) - 1


left = d[tar]
right = d[tar + 1]
p#rint(left, right)
diff = right - left
if (diff == 0):
    ans = 0
else:
    ans = diff

print(ans)


Fixed submission:
n = int(input())
d = list(map(int, input().split()))
d = sorted(d)
tar = int(n/2) - 1


left = d[tar]
right = d[tar + 1]
#print(left, right)
diff = right - left
if (diff == 0):
    ans = 0
else:
    ans = diff

print(ans)
Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
x = list(map(int, input().split()))

xSort = sorted(x)

dif = [0] * (m - 1)
for i in range(m - 1):
    dif[i] = xSort[i + 1] - xSort[i]
ans = sum(dif)

if (n == 1):
    print(ans)
else:
    for j in range(n - 1):
        tar = j + 1
        tarInd = tar * -1
        tarVal = sorted(dif)[tarInd]
        ans -= tarVal

    print(ans)
# n番目の要素を取得
# sorted(list)[-1] > 1番大きい
# sorted(list)[-２] > 2番大きい
# or
# array.argsort()
# > array ([1,0,2,4,3]) みたいな
'''
  import numpy as np
  difArray = np.array(dif)
  difIndex = difArray.argsort()

  for i in range(n - 1):
    tar = m - i
    maxIndex = difIndex[tar]
    maxVal = diff
'''


Fixed submission:
n, m = map(int, input().split())
x = list(map(int, input().split()))

xSort = sorted(x)

dif = [0] * (m - 1)
for i in range(m - 1):
    dif[i] = xSort[i + 1] - xSort[i]
ans = sum(dif)

if (n == 1 or m == 1):
    print(ans)

elif (n >= m):
    print('0')
else:
    tar = len(dif) - n + 1
    difSort = sorted(dif)
    difS_2 = difSort[:tar]
    ans = sum(difS_2)
    print(ans)
'''  
    for j in range(n - 1):
        tar = j + 1
        tarInd = tar * -1
        tarVal = sorted(dif)[tarInd]
        ans -= tarVal
'''
# print(ans)
# >>>TLE
#
# n番目の要素を取得
# sorted(list)[-1] > 1番大きい
# sorted(list)[-２] > 2番大きい
'''
  import numpy as np
  difArray = np.array(dif)
  difIndex = difArray.argsort()

  for i in range(n - 1):
    tar = m - i
    maxIndex = difIndex[tar]
    maxVal = diff
'''
Buggy python submission (verdict: Runtime Error):
n = int(input())
a = list(map(int, input().split()))
b = []
'''
b = [str(a[0])]
if (n == 1):
    print(a[0])
    exit()

a = a[1:]

for i in a:
    b.append(str(i))
    b.reverse()
'''

loop = int(n / 2)
loop_rest = n - loop

for i in range(loop):
    tar_index = (n - 1) - 2 * i
    tar = a[tar_index]

    b.append(str(tar))


if (n % 2 == 0):
    tar_index = 0
else:
    tar_index = 1

for i in range(loop_rest):
    b.append(str(a[tar_index]))
    tar_index += 2

print(' '.join(b))


Fixed submission:
n = int(input())
a = list(map(str, input().split()))
b = []
'''
b = [str(a[0])]
if (n == 1):
    print(a[0])
    exit()

a = a[1:]

for i in a:
    b.append(str(i))
    b.reverse()
'''
'''
loop = int(n / 2)
loop_rest = n - loop

for i in range(loop):
    tar_index = (n - 1) - 2 * i
    tar = a[tar_index]

    b.append(str(tar))


if (n % 2 == 0):
    tar_index = 0
else:
    tar_index = 1

for i in range(loop_rest):
    b.append(str(a[tar_index]))
    tar_index += 2
'''

# 一つおきでListを取る場合。
# a[0::2]
# 1つ目：起点。
# 2つ目：Step

# a[::-1]
# > -1step,つまりReverse

if n % 2 == 1:
    print(" ".join((a[0::2][::-1] + a[1::2])))
else:
    print(" ".join((a[1::2][::-1] + a[0::2])))

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
a = list(map(int, input().split()))

b = [str(a[0])]
if (n == 1):
    print(a[0])
    exit()

a = a[1:]

for i in a:
    b.append(str(i))
    b.reverse()


print(' '.join(b))


Fixed submission:
n = int(input())
a = list(map(str, input().split()))
b = []
'''
b = [str(a[0])]
if (n == 1):
    print(a[0])
    exit()

a = a[1:]

for i in a:
    b.append(str(i))
    b.reverse()
'''
'''
loop = int(n / 2)
loop_rest = n - loop

for i in range(loop):
    tar_index = (n - 1) - 2 * i
    tar = a[tar_index]

    b.append(str(tar))


if (n % 2 == 0):
    tar_index = 0
else:
    tar_index = 1

for i in range(loop_rest):
    b.append(str(a[tar_index]))
    tar_index += 2
'''

# 一つおきでListを取る場合。
# a[0::2]
# 1つ目：起点。
# 2つ目：Step

# a[::-1]
# > -1step,つまりReverse

if n % 2 == 1:
    print(" ".join((a[0::2][::-1] + a[1::2])))
else:
    print(" ".join((a[1::2][::-1] + a[0::2])))
Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())

a = [0] * n
for i in range(n):
    a[i] = int(input())

loop = [0] * n


if (2 not in a):
    print(-1)
    exit()

tar_index = 0
loop[0] = 1
# 何回目で２に到達するか
count = 0

while True:
    tar_index = a[tar_index] - 1
    #print(count, tar_index)
    count += 1

    if (tar_index == 1):
        print(count)
        exit()

    # 一回行った場所に戻ると、循環してるのでOUT
    if (loop[tar_index] == 1):
        print(-1)
        exit()


Fixed submission:
n = int(input())

a = [0] * n
for i in range(n):
    a[i] = int(input())

loop = [0] * n


if (2 not in a):
    print(-1)
    exit()

tar_index = 0
loop[0] = 1
# 何回目で２に到達するか
count = 0

while True:
    tar_index = a[tar_index] - 1
    #print(count, tar_index)
    count += 1

    if (tar_index == 1):
        print(count)
        exit()

    # 一回行った場所に戻ると、循環してるのでOUT
    if (loop[tar_index] == 1):
        print(-1)
        exit()

    loop[tar_index] = 1
Buggy python submission (verdict: Runtime Error):
import math
n, m = map(int, input().split())
dif = abs(n - m)

if (diff > 1):
    print(0)
else:
    x = math.factorial(n)
    y = math.factorial(m)

    if (n == m):
        tt = 2
    else:
        tt = 1

    ans = tt * (x * y) / (10 ** 9 + 7)

    print(ans)


Fixed submission:
import math
n, m = map(int, input().split())
diff = abs(n - m)

# 階乗は、factorial

if (diff > 1):
    print(0)
else:
    x = math.factorial(n)
    y = math.factorial(m)

    if (n == m):
        tt = 2
    else:
        tt = 1

    ans = tt * (x * y) % (10 ** 9 + 7)

    print(ans)