solved(python): baekjoon 11444

Author: himitery

baekjoon/python/11444/__init__.py

@@ -0,0 +1,47 @@
+import sys
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.num = int(read())
+        self.divide = 1_000_000_007
+
+    def solve(self) -> None:
+        if self.num == 0 or self.num == 1:
+            print(self.num)
+            return
+
+        num, matrix, result = self.num - 1, [[1, 1], [1, 0]], [[1, 0], [0, 1]]
+        while num > 0:
+            if num % 2 != 0:
+                result = self.mat_mul(result, matrix)
+            matrix = self.mat_mul(matrix, matrix)
+            num //= 2
+
+        print(result[0][0])
+
+    def mat_mul(
+        self,
+        matrix_a: list[list[int]],
+        matrix_b: list[list[int]],
+    ) -> list[list[int]]:
+        return [
+            [
+                (matrix_a[0][0] * matrix_b[0][0] + matrix_a[0][1] * matrix_b[1][0])
+                % self.divide,
+                (matrix_a[0][0] * matrix_b[0][1] + matrix_a[0][1] * matrix_b[1][1])
+                % self.divide,
+            ],
+            [
+                (matrix_a[1][0] * matrix_b[0][0] + matrix_a[1][1] * matrix_b[1][0])
+                % self.divide,
+                (matrix_a[1][0] * matrix_b[0][1] + matrix_a[1][1] * matrix_b[1][1])
+                % self.divide,
+            ],
+        ]
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/11444/main.py

@@ -0,0 +1,10 @@
+[
+  {
+    "input": [
+      "1000"
+    ],
+    "expected": [
+      "517691607"
+    ]
+  }
+]

baekjoon/python/11444/sample.json

@@ -0,0 +1,36 @@
+import json
+import os.path
+import unittest
+from io import StringIO
+from unittest.mock import patch
+
+from parameterized import parameterized
+
+from main import Problem
+
+
+def load_sample(filename: str):
+    path = os.path.join(os.path.dirname(os.path.abspath(__file__)), filename)
+
+    with open(path, "r") as file:
+        return [(case["input"], case["expected"]) for case in json.load(file)]
+
+
+class TestCase(unittest.TestCase):
+    @parameterized.expand(load_sample("sample.json"))
+    def test_case(self, case: str, expected: list[str]):
+        # When
+        with (
+            patch("sys.stdin.readline", side_effect=case),
+            patch("sys.stdout", new_callable=StringIO) as output,
+        ):
+            Problem().solve()
+
+            result = output.getvalue().strip()
+
+        # Then
+        self.assertEqual("\n".join(expected), result)
+
+
+if __name__ == "__main__":
+    unittest.main()