solved(python): baekjoon 1043

Author: himitery

baekjoon/python/1043/__init__.py

@@ -0,0 +1,40 @@
+import sys
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.n, self.m = map(int, read().split())
+        self.known = set(map(int, read().split()[1:]))
+        self.parties = [list(map(int, read().split()[1:])) for _ in range(self.m)]
+
+        self.parent, self.rank = list(range(self.n + 1)), [0] * (self.n + 1)
+
+    def solve(self) -> None:
+        [self.union(party[0], person) for party in self.parties for person in party[1:]]
+
+        truth = {self.find(person) for person in self.known}
+        print(len([party for party in self.parties if all(self.find(person) not in truth for person in party)]))
+
+    def find(self, person: int) -> int:
+        if self.parent[person] != person:
+            self.parent[person] = self.find(self.parent[person])
+
+        return self.parent[person]
+
+    def union(self, x: int, y: int) -> None:
+        x_root, y_root = self.find(x), self.find(y)
+        if x_root == y_root:
+            return
+
+        if self.rank[x_root] > self.rank[y_root]:
+            self.parent[y_root] = x_root
+        elif self.rank[x_root] < self.rank[y_root]:
+            self.parent[x_root] = y_root
+        else:
+            self.parent[y_root], self.rank[x_root] = x_root, 1
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/1043/main.py

@@ -0,0 +1,93 @@
+[
+  {
+    "input": [
+      "4 3",
+      "0",
+      "2 1 2",
+      "1 3",
+      "3 2 3 4"
+    ],
+    "expected": [
+      "3"
+    ]
+  },
+  {
+    "input": [
+      "4 1",
+      "1 1",
+      "4 1 2 3 4"
+    ],
+    "expected": [
+      "0"
+    ]
+  },
+  {
+    "input": [
+      "4 1",
+      "0",
+      "4 1 2 3 4"
+    ],
+    "expected": [
+      "1"
+    ]
+  },
+  {
+    "input": [
+      "4 5",
+      "1 1",
+      "1 1",
+      "1 2",
+      "1 3",
+      "1 4",
+      "2 4 1"
+    ],
+    "expected": [
+      "2"
+    ]
+  },
+  {
+    "input": [
+      "10 9",
+      "4 1 2 3 4",
+      "2 1 5",
+      "2 2 6",
+      "1 7",
+      "1 8",
+      "2 7 8",
+      "1 9",
+      "1 10",
+      "2 3 10",
+      "1 4"
+    ],
+    "expected": [
+      "4"
+    ]
+  },
+  {
+    "input": [
+      "8 5",
+      "3 1 2 7",
+      "2 3 4",
+      "1 5",
+      "2 5 6",
+      "2 6 8",
+      "1 8"
+    ],
+    "expected": [
+      "5"
+    ]
+  },
+  {
+    "input": [
+      "3 4",
+      "1 3",
+      "1 1",
+      "1 2",
+      "2 1 2",
+      "3 1 2 3"
+    ],
+    "expected": [
+      "0"
+    ]
+  }
+]

baekjoon/python/1043/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()