from functools import *

@lru_cache(None)
def f(n):
    if n < 3:
        return 2
    if n > 2 and n % 2 == 0:
        return 2 * f(n-2) - f(n-1) + 2
    if n > 2 and n % 2 != 0:
        return 2 * f(n-1) + f(n-2) - 2

print(f(170))

from functools import *

@lru_cache(None)
def f(n):
    if n < 3:
        return 2
    if n > 2 and n % 2 == 0:
        return 2 * f(n-2) - f(n-1) + 2
    if n > 2 and n % 2 != 0:
        return 2 * f(n-1) + f(n-2) - 2

print(f(170))

def F(a, b, s: str):
    if a >= b or a == 28:
        return a == b and 'BACA' not in s
    return F(a+2, b, s+'A') + F(a+3, b, s+'B') + F(a*2, b, s+'C')


print(F(2, 40, ''))

from itertools import permutations

nums = [1, 2, 3]
perm = permutations(nums)

for i in list(perm):
    print(i)

(1, 2, 3)
(1, 3, 2)
(2, 1, 3)
(2, 3, 1)
(3, 1, 2)
(3, 2, 1)

from itertools import permutations

words = ['hi', 'world', '!']
perm = permutations(words)

for i in list(perm):
    print(i)
На выходе мы получим:
('hi', 'world', '!')
('hi', '!', 'world')
('world', 'hi', '!')
('world', '!', 'hi')
('!', 'hi', 'world')
('!', 'world', 'hi')

from itertools import permutations

nums = [1, 2, 3, 4]
perm = permutations(nums, 2)

for i in list(perm):
    print(i)

(1, 2)
(1, 3)
(1, 4)
(2, 1)
(2, 3)
(2, 4)
(3, 1)
(3, 2)
(3, 4)
(4, 1)
(4, 2)
(4, 3)

import itertools
count = 0
for s in itertools.permutations('ЯРОСЛАВ', 5):
    slovo = ''.join(s)
    glas = [i for i in slovo if i in 'ЯОА']
    sogl = [i for i in slovo if i in 'РСЛВ']
    if len(sogl) > len(glas):  
        if all(x not in slovo for x in 'ЯА АЯ АО ОА ЯО ОЯ'.split()):  
            count += 1
print(count)

from itertools import product

seq1 = [1, 2]
seq2 = ['a', 'b']
result = list(product(seq1, seq2))
print(result)

[(1, 'a'), (1, 'b'), (2, 'a'), (2, 'b')]

from itertools import product

seq = ['a', 'b', 'c']
result = list(product(seq, repeat=2))
print(result)

[('a', 'a'), ('a', 'b'), ('a', 'c'), ('b', 'a'), ('b', 'b'), ('b', 'c'), ('c', 'a'), ('c', 'b'), ('c', 'c')]

from itertools import product

word = 'bat'
result = product(word, repeat=2)
for item in result:
    print(item)

('b', 'b')
('b', 'a')
('b', 't')
('a', 'b')
('a', 'a')
('a', 't')
('t', 'b')
('t', 'a')
('t', 't')

from fnmatch import fnmatch
from itertools import product

s = open('24.txt').readline()
for v in product('ABCDEFGHIJKLMNOPQRSTUVWXYZ', repeat=5):
    slovo = ''.join(v)
    if fnmatch(slovo, '?B??D'):  
        s = s.replace(slovo, '**** ****')
print(max(len(x) for x in s.split()))

from ipaddress import *
for mask in range(32+1):
    net = ip_network(f'175.122.80.13/{mask}', 0) 
    print(net)

Количество единиц в маске подсети указывает, сколько битов адреса IP отведено для сети, а оставшиеся биты - для узлов.

Для вычисления количества возможных значений маски подсети можно использовать следующую формулу: 2**n - 2

from ipaddress import *
net = ip_network('123.80.87.27/255.255.240.0', 0)
address = f'{net.network_address:b}'
print(address.count('0'))

from ipaddress import *
net = ip_network('226.185.90.162/255.255.252.0', 0)
print(net)  # 226.185.88.0/22
ip1 = ip_address('226.185.90.162')
ip2 = ip_address('226.185.88.0')
print(int(ip1) - int(ip2))

from ipaddress import *
net = ip_network('224.230.250.29/255.255.240.0', 0)
print(net.network_address)

from ipaddress import *
for mask in range(32+1):
    net = ip_network(f'111.81.176.27/{mask}', 0)
    print(net, net.netmask)  # дальше найти нашу сеть 111.81.160.0

Пример текста

Пример текста

file = open("example.txt", "r")  # Открываем файл example.txt на чтение

content = file.read()
print(content)

file = open("example.txt", "r")  # Открытие файла для чтения

for line in file:
    print(line.strip())

file.close()

for s in open('9.txt'):
    M = [int(x) for x in s.split()]

for s in open('9.txt'):
    M = [float(x) for x in s.replace(',', '.').split()]

M = [int(x) for x in open('17.txt')]

s = open('24.txt').readline()

s = open('24.txt').readlines()
for x in s:
    print(x)

s = open('24.txt').readline()
s = s.split('U')
mini = 999999
for i in range(len(s)-108):
    r = 'U'.join(s[i:i+109])
    mini = min(mini, len(r))
print(mini + 2)

s = open('24.txt').readline().split('T')
maxi = 0
for i in range(len(s)-100):
    r = 'T'.join(s[i:i+101])
    maxi = max(maxi, len(r))
print(maxi)

M = [int(x) for x in open('17.txt')]
avg = sum(M) / len(M)
R = []
for i in range(len(M)-2):
    x, y, z = M[i], M[i+1], M[i+2]
    if x < avg or y < avg or z < avg:
        if all('9' in str(a) for a in [x, y, z]):
            R.append(x + y + z)
print(len(R), max(R))

from string import *
alphabet = digits + ascii_uppercase
print(alphabet)  

s = open('24.txt').readline()
maxi = 0
for a in alphabet:
    s = s.replace(f'{a}', f'{a} {a}')
    if maxi < max([len(x) for x in s.split()]):
        maxi = max([len(x) for x in s.split()])
        print(a, maxi)
    s = s.replace(f'{a} {a}', f'{a}')
print(maxi)

cnt = 0
for s in open('9.txt'):
    M = [int(x) for x in s.split()]
    if len([x for x in M if abs(x) % 10 == 3]) == 3:
        A = [x for x in M if x > 0]
        B = [x for x in M if x < 0]
        if sum(A) ** 2 < sum(B) ** 2:
            cnt += 1
print(cnt)