@jinxonik / UniLecs #267

tricky_mul.py

from random import randint

# Tricky multiplication
def tricky_mul(arr):
  mul = 1
  new_arr = []
  for a in arr:
    new_arr.append(mul)
    mul *= a

  mul = 1
  i = len(arr)-1
  for a in arr[::-1]:
    new_arr[i] *= mul
    mul *= a
    i -= 1

  return new_arr

if __name__ == '__main__':

  arr = [1, 2, 3, 4]
  new_arr = tricky_mul(arr)
  print(f'Source array = {arr}')
  print(f'New array = {new_arr}')
  print()

  arr = [-1, 1, 0, -3, 3]
  new_arr = tricky_mul(arr)
  print(f'Source array = {arr}')
  print(f'New array = {new_arr}')

  for n in (5, 20, 50):
    arr = []
    for i in range(n):
      arr.append(randint(-20, 20))
    new_arr = tricky_mul(arr)
    print()
    print(f'Source array = {arr}')
    print(f'New array = {new_arr}')