mathdatech/Python
1
0
Fork 0
mirror of https://github.com/TheAlgorithms/Python.git synced 2025-03-12 17:49:50 +00:00
Code Issues Packages Projects Releases Wiki Activity

Added doctests for matrix/count_islands_in_matrix.py

Browse Source
This commit is contained in:
CheerfulBear22 2025-02-03 19:48:07 +00:00
parent 6c92c5a539
commit 214e18a13b
1 changed files with 44 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
matrix/count_islands_in_matrix.py
View File

@ -5,11 +5,36 @@
class Matrix: # Public class to implement a graph
def __init__(self, row: int, col: int, graph: list[list[bool]]) -> None:
"""
Initialise matrix with number of rows, columns, and graph
>>> m = Matrix(4, 3, [[True, False, False, False], [True, False, True, False], [False, False, True, True]])
>>> m.ROW
4
>>> m.COL
3
>>> m.graph
[[True, False, False, False], [True, False, True, False], [False, False, True, True]]
"""
self.ROW = row
self.COL = col
self.graph = graph
def is_safe(self, i: int, j: int, visited: list[list[bool]]) -> bool:
"""
Checks if the cell (i, j) can be visited
>>> visited = [[False, False, False], [False, False, False], [False, False, False]]
>>> m = Matrix(3, 3, [[True, False, False], [False, False, True], [False, False, True]])
>>> m.is_safe(0, 0, visited)
True
>>> m.is_safe(0, 2, visited)
False
>>> m.is_safe(-1, 2, visited)
False
>>> m.is_safe(1, 5, visited)
False
"""
return (
0 <= i < self.ROW
and 0 <= j < self.COL
@ -18,7 +43,15 @@ class Matrix: # Public class to implement a graph
)
def diffs(self, i: int, j: int, visited: list[list[bool]]) -> None:
# Checking all 8 elements surrounding nth element
"""
Checking all 8 elements surrounding nth element
>>> visited = [[False, False, False], [False, False, False], [False, False, False]]
>>> m = Matrix(3, 3, [[True, True, False], [False, True, False], [True, False, True]])
>>> m.diffs(0, 0, visited)
>>> visited
[[True, True, False], [False, True, False], [False, False, False]]
"""
row_nbr = [-1, -1, -1, 0, 0, 1, 1, 1] # Coordinate order
col_nbr = [-1, 0, 1, -1, 1, -1, 0, 1]
visited[i][j] = True # Make those cells visited
@ -26,7 +59,16 @@ class Matrix: # Public class to implement a graph
if self.is_safe(i + row_nbr[k], j + col_nbr[k], visited):
self.diffs(i + row_nbr[k], j + col_nbr[k], visited)
def count_islands(self) -> int: # And finally, count all islands.
def count_islands(self) -> int:
"""
Counts the number of islands in the matrix
>>> m = Matrix(3, 4, [[True, True, False, False], [False, True, False, True], [True, False, False, True]])
>>> m.count_islands()
3
>>> m2 = Matrix(3, 3, [[True, True, False], [True, False, False], [False, False, True]])
2
"""
visited = [[False for j in range(self.COL)] for i in range(self.ROW)]
count = 0
for i in range(self.ROW):