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#!/bin/env python
""" https://perlweeklychallenge.org/blog/perl-weekly-challenge-078/
Task 2
Left Rotation
19.9.2020 Lubos Kolouch """
class ListRotator:
""" Rotate the array based on list of elems """
def __init__(self, arr: list(), elems: list()):
self.arr = arr
self.elems = elems
def rotate_arr(self, first: int):
""" Rotate the array so that passed elem is first """
return self.arr[first:] + self.arr[0:first]
def process_offset(self):
""" Process the list of elems for rotation """
output = list()
for elem in self.elems:
output.append(self.rotate_arr(elem))
return output
test_list = ListRotator(arr=[10, 20, 30, 40, 50], elems=[3, 4])
assert test_list.process_offset() == [[40, 50, 10, 20, 30], [50, 10, 20, 30, 40]]
test_list = ListRotator(arr=[7, 4, 2, 6, 3], elems=[1, 3, 4])
assert test_list.process_offset() == [[4, 2, 6, 3, 7], [6, 3, 7, 4, 2], [3, 7, 4, 2, 6]]
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