solved(python): baekjoon 1167

Author: himitery

baekjoon/python/1167/__init__.py

@@ -0,0 +1,38 @@
+import sys
+from collections import defaultdict, deque
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.v = int(read())
+        self.data = defaultdict(list[tuple[int, int]])
+
+        for line in [list(map(int, read().split())) for _ in range(self.v)]:
+            for idx in range(1, len(line) - 1, 2):
+                self.data[line[0]].append((line[idx], line[idx + 1]))
+
+    def solve(self) -> None:
+        node, maximum = self.dfs(1)
+
+        print(max(maximum, self.dfs(node)[1]))
+
+    def dfs(self, start_node: int) -> tuple[int, int]:
+        queue, visited, maximum, node = deque([(start_node, 0)]), {start_node}, 0, start_node
+
+        while queue:
+            current, weight = queue.pop()
+            if weight > maximum:
+                maximum, node = weight, current
+
+            for next_node, next_weight in self.data[current]:
+                if next_node not in visited:
+                    visited.add(next_node)
+                    queue.append((next_node, weight + next_weight))
+
+        return node, maximum
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/1167/main.py

@@ -0,0 +1,15 @@
+[
+  {
+    "input": [
+      "5",
+      "1 3 2 -1",
+      "2 4 4 -1",
+      "3 1 2 4 3 -1",
+      "4 2 4 3 3 5 6 -1",
+      "5 4 6 -1"
+    ],
+    "expected": [
+      "11"
+    ]
+  }
+]

baekjoon/python/1167/sample.json

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+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()