solved(python): baekjoon 2623

Author: himitery

baekjoon/python/2623/__init__.py

@@ -0,0 +1,44 @@
+import sys
+from collections import defaultdict, deque
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.n, self.m = map(int, read().split())
+        self.data = defaultdict(list)
+        self.weights = [0 for _ in range(self.n + 1)]
+
+        for _ in range(self.m):
+            values = list(map(int, read().split()))
+            for idx in range(2, values[0] + 1):
+                self.data[values[idx]].append(values[idx - 1])
+                self.weights[values[idx - 1]] += 1
+
+    def solve(self) -> None:
+        print(*self.topology_sort(), sep="\n")
+
+    def topology_sort(self) -> list[int]:
+        queue, sequence = (
+            deque(filter(lambda x: self.weights[x] == 0, range(1, self.n + 1))),
+            [],
+        )
+
+        while queue:
+            num = queue.popleft()
+            if num in sequence:
+                continue
+
+            sequence.append(num)
+
+            for next_num in self.data[num][-1::-1]:
+                self.weights[next_num] -= 1
+                if self.weights[next_num] == 0:
+                    queue.append(next_num)
+
+        return sequence[-1::-1] if len(sequence) == self.n else [0]
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/2623/main.py

@@ -0,0 +1,18 @@
+[
+  {
+    "input": [
+      "6 3",
+      "3 1 4 3",
+      "4 6 2 5 4",
+      "2 2 3"
+    ],
+    "expected": [
+      "6",
+      "2",
+      "1",
+      "5",
+      "4",
+      "3"
+    ]
+  }
+]

baekjoon/python/2623/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()