solved(python): baekjoon 16953

Author: himitery

baekjoon/python/16953/__init__.py

@@ -0,0 +1,31 @@
+import sys
+from collections import deque
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.src, self.dest = map(int, read().split())
+
+    def solve(self) -> None:
+        print(self.bfs())
+
+    def bfs(self) -> int:
+        queue, visited = deque([(self.src, 1)]), {self.src}
+
+        while queue:
+            current, depth = queue.popleft()
+            if current == self.dest:
+                return depth
+
+            for next_node in [current * 2, current * 10 + 1]:
+                if next_node <= self.dest and next_node not in visited:
+                    visited.add(next_node)
+                    queue.append((next_node, depth + 1))
+
+        return -1
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/16953/main.py

@@ -0,0 +1,26 @@
+[
+  {
+    "input": [
+      "2 162"
+    ],
+    "expected": [
+      "5"
+    ]
+  },
+  {
+    "input": [
+      "4 42"
+    ],
+    "expected": [
+      "-1"
+    ]
+  },
+  {
+    "input": [
+      "100 40021"
+    ],
+    "expected": [
+      "5"
+    ]
+  }
+]

baekjoon/python/16953/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().rstrip()
+
+        # Then
+        self.assertEqual("\n".join(expected), result)
+
+
+if __name__ == "__main__":
+    unittest.main()