lists

1

a = [1, 2, 3, 4, 5]
b = []
for i in range(1, 6):
    b.append(a[-i])
print(b)

2

from random import *
a = []
b = []
for i in range(20):
    r = randint(0, 100)
    a.append(r)
    if r % 2 == 0:
        b.append(r)
print(a, '\n', b)

3

from random import *
a = int(input('vvedit chyslo vid 0 do 100: '))
c = []
b = []
for i in range(100):
    r = randint(0, 100)
    c.append(r)
    if r == a:
        b.append(r)
print(f'chyslo zustrichaetsa {len(b)} raz(iv)')

4

from random import *

a = []
one = 0
two = 0
three = 0

for i in range(200):
    r = randint(0, 200)
    a.append(r)
    if r >= 0 and r <= 9:
        one += 1
    elif r >= 10 and r <= 99:
        two += 1
    elif r >= 100 and r <= 999:
        three += 1

one = one / 2
two = two / 2
three = three / 2

print('one_digit', one / 2)
print('one_digit', two / 2)
print('one_digit', three / 2)

5

from random import *

m = []
n = []
a = []

for i in range(randint(0, 500)):
    m.append(randint(0, 20))

for i in range(randint(0, 500)):
    n.append(randint(0, 20))

if len(m) >= len(n):
    for i in range(len(n)):
        if n[i] == m[0]:
            a.append(n[i])
        del m[0]
else:
    for i in range(len(m)):
        if m[i] == n[0]:
            a.append(m[i])
        del n[0]

print(set(a))

7

roman = [(1000, "M"), (900, "CM"), (500, "D"), (400, "CD"),(100, "C"), (90, "XC"), (50, "L"), (40, "XL"),(10, "X"), (9, "IX"), (5, "V"), (4, "IV"),(1, "I")]
a = []
for i in range(1, 4000):
    result = ''
    t = i
    for val, num in roman:
        while t >= val:
            result += num
            t -= val
    a.append(result)

for num in a:
    print(num)