solved(python): baekjoon 2206

Author: himitery

baekjoon/python/2206/__init__.py

@@ -0,0 +1,39 @@
+import sys
+from collections import deque
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.n, self.m = map(int, read().split())
+        self.matrix = [list(map(int, read())) for _ in range(self.n)]
+
+    def solve(self) -> None:
+        print(self.dijkstra())
+
+    def dijkstra(self) -> int:
+        queue, visited = deque([((0, 0), 1, True)]), {(True, 0, 0)}
+
+        while queue:
+            (x, y), depth, can_break = queue.popleft()
+            if (x, y) == (self.m - 1, self.n - 1):
+                return depth
+
+            for nx, ny in [(x + dx, y + dy) for dx, dy in [(-1, 0), (1, 0), (0, -1), (0, 1)]]:
+                if not (0 <= nx < self.m and 0 <= ny < self.n):
+                    continue
+
+                if self.matrix[ny][nx] == 0 and (can_break, nx, ny) not in visited:
+                    visited.add((can_break, nx, ny))
+                    queue.append(((nx, ny), depth + 1, can_break))
+
+                if self.matrix[ny][nx] == 1 and can_break and (False, nx, ny) not in visited:
+                    visited.add((False, nx, ny))
+                    queue.append(((nx, ny), depth + 1, False))
+
+        return -1
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/2206/main.py

@@ -0,0 +1,28 @@
+[
+  {
+    "input": [
+      "6 4",
+      "0100",
+      "1110",
+      "1000",
+      "0000",
+      "0111",
+      "0000"
+    ],
+    "expected": [
+      "15"
+    ]
+  },
+  {
+    "input": [
+      "4 4",
+      "0111",
+      "1111",
+      "1111",
+      "1110"
+    ],
+    "expected": [
+      "-1"
+    ]
+  }
+]

baekjoon/python/2206/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()