mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-18 01:00:15 +00:00
b2ed8d443c
* rotate_matrix.py: Add type hints for return values @obelisk0114 Your review please? * Fix typo * Run the code thru python/black https://github.com/python/black * Fix 270 comment * Simplify with get_data() and test the alternatives * ) * 3 * Update rotate_matrix.py * Update rotate_matrix.py
101 lines
2.5 KiB
Python
101 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
In this problem, we want to rotate the matrix elements by 90, 180, 270 (counterclockwise)
|
|
Discussion in stackoverflow:
|
|
https://stackoverflow.com/questions/42519/how-do-you-rotate-a-two-dimensional-array
|
|
"""
|
|
|
|
|
|
def make_matrix(row_size: int = 4) -> [[int]]:
|
|
"""
|
|
>>> make_matrix()
|
|
[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]]
|
|
>>> make_matrix(1)
|
|
[[1]]
|
|
>>> make_matrix(-2)
|
|
[[1, 2], [3, 4]]
|
|
>>> make_matrix(3)
|
|
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
|
|
>>> make_matrix() == make_matrix(4)
|
|
True
|
|
"""
|
|
row_size = abs(row_size) or 4
|
|
return [[1 + x + y * row_size for x in range(row_size)] for y in range(row_size)]
|
|
|
|
|
|
def rotate_90(matrix: [[]]) -> [[]]:
|
|
"""
|
|
>>> rotate_90(make_matrix())
|
|
[[4, 8, 12, 16], [3, 7, 11, 15], [2, 6, 10, 14], [1, 5, 9, 13]]
|
|
>>> rotate_90(make_matrix()) == transpose(reverse_column(make_matrix()))
|
|
True
|
|
"""
|
|
|
|
return reverse_row(transpose(matrix))
|
|
# OR.. transpose(reverse_column(matrix))
|
|
|
|
|
|
def rotate_180(matrix: [[]]) -> [[]]:
|
|
"""
|
|
>>> rotate_180(make_matrix())
|
|
[[16, 15, 14, 13], [12, 11, 10, 9], [8, 7, 6, 5], [4, 3, 2, 1]]
|
|
>>> rotate_180(make_matrix()) == reverse_column(reverse_row(make_matrix()))
|
|
True
|
|
"""
|
|
|
|
return reverse_row(reverse_column(matrix))
|
|
# OR.. reverse_column(reverse_row(matrix))
|
|
|
|
|
|
def rotate_270(matrix: [[]]) -> [[]]:
|
|
"""
|
|
>>> rotate_270(make_matrix())
|
|
[[13, 9, 5, 1], [14, 10, 6, 2], [15, 11, 7, 3], [16, 12, 8, 4]]
|
|
>>> rotate_270(make_matrix()) == transpose(reverse_row(make_matrix()))
|
|
True
|
|
"""
|
|
|
|
return reverse_column(transpose(matrix))
|
|
# OR.. transpose(reverse_row(matrix))
|
|
|
|
|
|
def transpose(matrix: [[]]) -> [[]]:
|
|
matrix[:] = [list(x) for x in zip(*matrix)]
|
|
return matrix
|
|
|
|
|
|
def reverse_row(matrix: [[]]) -> [[]]:
|
|
matrix[:] = matrix[::-1]
|
|
return matrix
|
|
|
|
|
|
def reverse_column(matrix: [[]]) -> [[]]:
|
|
matrix[:] = [x[::-1] for x in matrix]
|
|
return matrix
|
|
|
|
|
|
def print_matrix(matrix: [[]]) -> [[]]:
|
|
for i in matrix:
|
|
print(*i)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
matrix = make_matrix()
|
|
print("\norigin:\n")
|
|
print_matrix(matrix)
|
|
print("\nrotate 90 counterclockwise:\n")
|
|
print_matrix(rotate_90(matrix))
|
|
|
|
matrix = make_matrix()
|
|
print("\norigin:\n")
|
|
print_matrix(matrix)
|
|
print("\nrotate 180:\n")
|
|
print_matrix(rotate_180(matrix))
|
|
|
|
matrix = make_matrix()
|
|
print("\norigin:\n")
|
|
print_matrix(matrix)
|
|
print("\nrotate 270 counterclockwise:\n")
|
|
print_matrix(rotate_270(matrix))
|