Add sudoku
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parent
b3694d589d
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4 changed files with 168 additions and 8 deletions
89
neetcode/arrays/valid_sudoku/README.md
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89
neetcode/arrays/valid_sudoku/README.md
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You are given a a 9 x 9 Sudoku board board. A Sudoku board is valid if the following rules are followed:
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Each row must contain the digits 1-9 without duplicates.
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Each column must contain the digits 1-9 without duplicates.
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Each of the nine 3 x 3 sub-boxes of the grid must contain the digits 1-9 without duplicates.
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Return true if the Sudoku board is valid, otherwise return false
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Note: A board does not need to be full or be solvable to be valid.
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Example 1:
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Input: board =
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[["1","2",".",".","3",".",".",".","."],
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["4",".",".","5",".",".",".",".","."],
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[".","9","8",".",".",".",".",".","3"],
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["5",".",".",".","6",".",".",".","4"],
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[".",".",".","8",".","3",".",".","5"],
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["7",".",".",".","2",".",".",".","6"],
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[".",".",".",".",".",".","2",".","."],
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[".",".",".","4","1","9",".",".","8"],
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[".",".",".",".","8",".",".","7","9"]]
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Output: true
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Example 2:
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Input: board =
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[["1","2",".",".","3",".",".",".","."],
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["4",".",".","5",".",".",".",".","."],
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[".","9","1",".",".",".",".",".","3"],
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["5",".",".",".","6",".",".",".","4"],
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[".",".",".","8",".","3",".",".","5"],
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["7",".",".",".","2",".",".",".","6"],
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[".",".",".",".",".",".","2",".","."],
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[".",".",".","4","1","9",".",".","8"],
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[".",".",".",".","8",".",".","7","9"]]
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Output: false
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Explanation: There are two 1's in the top-left 3x3 sub-box.
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Constraints:
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board.length == 9
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board[i].length == 9
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board[i][j] is a digit 1-9 or '.'.
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# Решение
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Пусть будет матрица 3х3 где будут храниться числа в каждом квадрате валидации, т.е.
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```
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sq = [
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(), (), (),
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(), (), (),
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(), (), (),
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]
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```
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Когда начнем проходить по двумерной матрице - будем смотреть на номер строк и остаток деления на три от длины проверяемого столбца, чтобы определять в какой квадрат писать
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i // 3
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[
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0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0
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1 1 1 1 1 1 1 1 1
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1 1 1 1 1 1 1 1 1
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1 1 1 1 1 1 1 1 1
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2 2 2 2 2 2 2 2 2
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2 2 2 2 2 2 2 2 2
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2 2 2 2 2 2 2 2 2
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]
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j // 3
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[
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0 0 0 1 1 1 2 2 2
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0 0 0 1 1 1 2 2 2
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0 0 0 1 1 1 2 2 2
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0 0 0 1 1 1 2 2 2
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0 0 0 1 1 1 2 2 2
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0 0 0 1 1 1 2 2 2
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0 0 0 1 1 1 2 2 2
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0 0 0 1 1 1 2 2 2
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0 0 0 1 1 1 2 2 2
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]
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74
neetcode/arrays/valid_sudoku/main.py
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neetcode/arrays/valid_sudoku/main.py
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from typing import Dict, List, Set
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import pytest
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from collections import defaultdict
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class Solution:
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"""Bruteforce solution (4 hints)"""
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def isValidSudoku(self, board: List[List[str]]) -> bool:
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squares: Dict = {
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"00": set(),
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"01": set(),
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"02": set(),
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"10": set(),
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"11": set(),
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"12": set(),
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"20": set(),
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"21": set(),
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"22": set(),
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}
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lines = defaultdict(set)
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for i in range(0, len(board)):
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for j in range(0, len(board[i])):
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board_elem = board[i][j]
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squares_index = f"{i // 3}{j // 3}"
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squares_index_len = len(squares[squares_index])
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lines_index_len = len(lines[squares_index])
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if board_elem != ".":
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squares[squares_index].add(board_elem)
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if len(squares[squares_index]) == squares_index_len:
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return False
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lines[f"{i}{j}"].add(board_elem)
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if len(lines[f"{i}{j}"]) == lines_index_len:
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breakpoint()
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return False
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return True
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@pytest.mark.parametrize(
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"input_value, expected_value",
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[
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(
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[
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["1", "2", ".", ".", "3", ".", ".", ".", "."],
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["4", ".", ".", "5", ".", ".", ".", ".", "."],
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[".", "9", "8", ".", ".", ".", ".", ".", "3"],
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["5", ".", ".", ".", "6", ".", ".", ".", "4"],
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[".", ".", ".", "8", ".", "3", ".", ".", "5"],
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["7", ".", ".", ".", "2", ".", ".", ".", "6"],
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[".", ".", ".", ".", ".", ".", "2", ".", "."],
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[".", ".", ".", "4", "1", "9", ".", ".", "8"],
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[".", ".", ".", ".", "8", ".", ".", "7", "9"],
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],
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True,
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),
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(
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[
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["1", "2", ".", ".", "3", ".", ".", ".", "."],
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["4", ".", ".", "5", ".", ".", ".", ".", "."],
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[".", "9", "1", ".", ".", ".", ".", ".", "3"],
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["5", ".", ".", ".", "6", ".", ".", ".", "4"],
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[".", ".", ".", "8", ".", "3", ".", ".", "5"],
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["7", ".", ".", ".", "2", ".", ".", ".", "6"],
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[".", ".", ".", ".", ".", ".", "2", ".", "."],
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[".", ".", ".", "4", "1", "9", ".", ".", "8"],
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[".", ".", ".", ".", "8", ".", ".", "7", "9"],
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],
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False,
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),
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],
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)
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def test_solution(input_value, expected_value):
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s = Solution()
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assert s.isValidSudoku(board=input_value) == expected_value
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9
poetry.lock
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9
poetry.lock
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# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
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# This file is automatically @generated by Poetry 1.8.4 and should not be changed by hand.
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[[package]]
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name = "colorama"
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version = "0.4.6"
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description = "Cross-platform colored terminal text."
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category = "main"
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optional = false
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python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
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files = [
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name = "exceptiongroup"
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version = "1.2.2"
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description = "Backport of PEP 654 (exception groups)"
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category = "main"
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optional = false
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python-versions = ">=3.7"
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files = [
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name = "iniconfig"
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version = "2.0.0"
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description = "brain-dead simple config-ini parsing"
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category = "main"
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optional = false
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python-versions = ">=3.7"
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files = [
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name = "packaging"
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version = "24.2"
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description = "Core utilities for Python packages"
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category = "main"
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optional = false
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python-versions = ">=3.8"
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files = [
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name = "pluggy"
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version = "1.5.0"
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description = "plugin and hook calling mechanisms for python"
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category = "main"
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optional = false
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python-versions = ">=3.8"
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files = [
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name = "pytest"
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version = "8.3.4"
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description = "pytest: simple powerful testing with Python"
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category = "main"
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optional = false
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python-versions = ">=3.8"
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files = [
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name = "tomli"
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version = "2.2.1"
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description = "A lil' TOML parser"
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category = "main"
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optional = false
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python-versions = ">=3.8"
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files = [
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4
pyrightconfig.json
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4
pyrightconfig.json
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{
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"venv": ".venv",
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"venvPath": "/Users/antonsalimov/Projects/Learning/algos_and_structures",
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}
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