Add sudoku

neetcode/arrays/valid_sudoku/README.md

@@ -0,0 +1,89 @@
+You are given a a 9 x 9 Sudoku board board. A Sudoku board is valid if the following rules are followed:
+
+Each row must contain the digits 1-9 without duplicates.
+Each column must contain the digits 1-9 without duplicates.
+Each of the nine 3 x 3 sub-boxes of the grid must contain the digits 1-9 without duplicates.
+Return true if the Sudoku board is valid, otherwise return false
+
+Note: A board does not need to be full or be solvable to be valid.
+
+Example 1:
+
+
+
+Input: board = 
+[["1","2",".",".","3",".",".",".","."],
+ ["4",".",".","5",".",".",".",".","."],
+ [".","9","8",".",".",".",".",".","3"],
+ ["5",".",".",".","6",".",".",".","4"],
+ [".",".",".","8",".","3",".",".","5"],
+ ["7",".",".",".","2",".",".",".","6"],
+ [".",".",".",".",".",".","2",".","."],
+ [".",".",".","4","1","9",".",".","8"],
+ [".",".",".",".","8",".",".","7","9"]]
+
+Output: true
+Example 2:
+
+Input: board = 
+[["1","2",".",".","3",".",".",".","."],
+ ["4",".",".","5",".",".",".",".","."],
+ [".","9","1",".",".",".",".",".","3"],
+ ["5",".",".",".","6",".",".",".","4"],
+ [".",".",".","8",".","3",".",".","5"],
+ ["7",".",".",".","2",".",".",".","6"],
+ [".",".",".",".",".",".","2",".","."],
+ [".",".",".","4","1","9",".",".","8"],
+ [".",".",".",".","8",".",".","7","9"]]
+
+Output: false
+Explanation: There are two 1's in the top-left 3x3 sub-box.
+
+Constraints:
+
+board.length == 9
+board[i].length == 9
+board[i][j] is a digit 1-9 or '.'.
+
+# Решение
+Пусть будет матрица 3х3 где будут храниться числа в каждом квадрате валидации, т.е.
+```
+sq = [
+    (), (), (),
+    (), (), (),
+    (), (), (),
+]
+```
+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
+
+
+i // 3
+[
+    0 0 0  0 0 0  0 0 0
+    0 0 0  0 0 0  0 0 0
+    0 0 0  0 0 0  0 0 0
+
+    1 1 1  1 1 1  1 1 1
+    1 1 1  1 1 1  1 1 1
+    1 1 1  1 1 1  1 1 1
+
+    2 2 2  2 2 2  2 2 2
+    2 2 2  2 2 2  2 2 2
+    2 2 2  2 2 2  2 2 2
+]
+
+j // 3
+[
+    0 0 0  1 1 1  2 2 2
+    0 0 0  1 1 1  2 2 2
+    0 0 0  1 1 1  2 2 2
+
+    0 0 0  1 1 1  2 2 2
+    0 0 0  1 1 1  2 2 2
+    0 0 0  1 1 1  2 2 2
+
+    0 0 0  1 1 1  2 2 2
+    0 0 0  1 1 1  2 2 2
+    0 0 0  1 1 1  2 2 2
+]
+

neetcode/arrays/valid_sudoku/main.py

@@ -0,0 +1,74 @@
+from typing import Dict, List, Set
+import pytest
+from collections import defaultdict
+
+
+class Solution:
+    """Bruteforce solution (4 hints)"""
+
+    def isValidSudoku(self, board: List[List[str]]) -> bool:
+        squares: Dict = {
+            "00": set(),
+            "01": set(),
+            "02": set(),
+            "10": set(),
+            "11": set(),
+            "12": set(),
+            "20": set(),
+            "21": set(),
+            "22": set(),
+        }
+        lines = defaultdict(set)
+        for i in range(0, len(board)):
+            for j in range(0, len(board[i])):
+                board_elem = board[i][j]
+                squares_index = f"{i // 3}{j // 3}"
+                squares_index_len = len(squares[squares_index])
+                lines_index_len = len(lines[squares_index])
+                if board_elem != ".":
+                    squares[squares_index].add(board_elem)
+                    if len(squares[squares_index]) == squares_index_len:
+                        return False
+                    lines[f"{i}{j}"].add(board_elem)
+                    if len(lines[f"{i}{j}"]) == lines_index_len:
+                        breakpoint()
+                        return False
+        return True
+
+
+@pytest.mark.parametrize(
+    "input_value, expected_value",
+    [
+        (
+            [
+                ["1", "2", ".", ".", "3", ".", ".", ".", "."],
+                ["4", ".", ".", "5", ".", ".", ".", ".", "."],
+                [".", "9", "8", ".", ".", ".", ".", ".", "3"],
+                ["5", ".", ".", ".", "6", ".", ".", ".", "4"],
+                [".", ".", ".", "8", ".", "3", ".", ".", "5"],
+                ["7", ".", ".", ".", "2", ".", ".", ".", "6"],
+                [".", ".", ".", ".", ".", ".", "2", ".", "."],
+                [".", ".", ".", "4", "1", "9", ".", ".", "8"],
+                [".", ".", ".", ".", "8", ".", ".", "7", "9"],
+            ],
+            True,
+        ),
+        (
+            [
+                ["1", "2", ".", ".", "3", ".", ".", ".", "."],
+                ["4", ".", ".", "5", ".", ".", ".", ".", "."],
+                [".", "9", "1", ".", ".", ".", ".", ".", "3"],
+                ["5", ".", ".", ".", "6", ".", ".", ".", "4"],
+                [".", ".", ".", "8", ".", "3", ".", ".", "5"],
+                ["7", ".", ".", ".", "2", ".", ".", ".", "6"],
+                [".", ".", ".", ".", ".", ".", "2", ".", "."],
+                [".", ".", ".", "4", "1", "9", ".", ".", "8"],
+                [".", ".", ".", ".", "8", ".", ".", "7", "9"],
+            ],
+            False,
+        ),
+    ],
+)
+def test_solution(input_value, expected_value):
+    s = Solution()
+    assert s.isValidSudoku(board=input_value) == expected_value

poetry.lock

@@ -1,10 +1,9 @@
-# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.4 and should not be changed by hand.
 
 [[package]]
 name = "colorama"
 version = "0.4.6"
 description = "Cross-platform colored terminal text."
-category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 files = [
@@ -16,7 +15,6 @@ files = [
 name = "exceptiongroup"
 version = "1.2.2"
 description = "Backport of PEP 654 (exception groups)"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -31,7 +29,6 @@ test = ["pytest (>=6)"]
 name = "iniconfig"
 version = "2.0.0"
 description = "brain-dead simple config-ini parsing"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -43,7 +40,6 @@ files = [
 name = "packaging"
 version = "24.2"
 description = "Core utilities for Python packages"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -55,7 +51,6 @@ files = [
 name = "pluggy"
 version = "1.5.0"
 description = "plugin and hook calling mechanisms for python"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -71,7 +66,6 @@ testing = ["pytest", "pytest-benchmark"]
 name = "pytest"
 version = "8.3.4"
 description = "pytest: simple powerful testing with Python"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -94,7 +88,6 @@ dev = ["argcomplete", "attrs (>=19.2)", "hypothesis (>=3.56)", "mock", "pygments
 name = "tomli"
 version = "2.2.1"
 description = "A lil' TOML parser"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [

pyrightconfig.json

@@ -0,0 +1,4 @@
+{
+  "venv": ".venv",
+  "venvPath": "/Users/antonsalimov/Projects/Learning/algos_and_structures",
+}