Added leetcode exercise 36

leetcode/17_letter_combinations_of_a_phone_number.py

@@ -1,21 +1,24 @@
+from typing import List
+
+
 class Solution:
     def letterCombinations(self, digits: str) -> List[str]:
         if len(digits) == 0:
             return []
 
         options = {
-            '2': ('a', 'b', 'c'),
-            '3': ('d', 'e', 'f'),
-            '4': ('g', 'h', 'i'),
-            '5': ('j', 'k', 'l'),
-            '6': ('m', 'n', 'o'),
-            '7': ('p', 'q', 'r', 's'),
-            '8': ('t', 'u', 'v'),
-            '9': ('w', 'x', 'y', 'z')
+            "2": ("a", "b", "c"),
+            "3": ("d", "e", "f"),
+            "4": ("g", "h", "i"),
+            "5": ("j", "k", "l"),
+            "6": ("m", "n", "o"),
+            "7": ("p", "q", "r", "s"),
+            "8": ("t", "u", "v"),
+            "9": ("w", "x", "y", "z"),
         }
 
         pools = (options[digit] for digit in digits)
         result = [""]
         for pool in pools:
-            result = [x+y for x in result for y in pool]
+            result = [x + y for x in result for y in pool]
         return result

leetcode/36_valid_sudoku.py

@@ -0,0 +1,50 @@
+from typing import List
+import pytest
+
+
+class Solution:
+    def isValidSudoku(self, board: List[List[str]]) -> bool:
+        rows, cols, cubes = set(), set(), set()
+        for i in range(9):
+            for j in range(9):
+                val = board[i][j]
+                if not val.isdigit():
+                    continue
+
+                cube = (i // 3) * 3 + (j // 3)
+                if (i, val) in rows or (j, val) in cols or (cube, val) in cubes:
+                    return False
+
+                rows.add((i, val))
+                cols.add((j, val))
+                cubes.add((cube, val))
+
+        return True
+
+
+@pytest.fixture
+def solution():
+    return Solution()
+
+
+@pytest.mark.parametrize(
+    "sudoku, expected",
+    [
+        (
+            [
+                ["5", "3", ".", ".", "7", ".", ".", ".", "."],
+                ["6", ".", ".", "1", "9", "5", ".", ".", "."],
+                [".", "9", "8", ".", ".", ".", ".", "6", "."],
+                ["8", ".", ".", ".", "6", ".", ".", ".", "3"],
+                ["4", ".", ".", "8", ".", "3", ".", ".", "1"],
+                ["7", ".", ".", ".", "2", ".", ".", ".", "6"],
+                [".", "6", ".", ".", ".", ".", "2", "8", "."],
+                [".", ".", ".", "4", "1", "9", ".", ".", "5"],
+                [".", ".", ".", ".", "8", ".", ".", "7", "9"],
+            ],
+            True,
+        )
+    ],
+)
+def test_search(solution: Solution, sudoku: List[List[str]], expected: bool):
+    assert solution.isValidSudoku(sudoku) == expected

templates/leetcode.j2

@@ -1,3 +1,4 @@
+from typing import List
 import pytest