solved(python): baekjoon 2887

Author: himitery

baekjoon/python/2887/__init__.py

@@ -0,0 +1,62 @@
+import sys
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.n = int(read())
+        self.planets = []
+
+        for idx in range(self.n):
+            x, y, z = map(int, read().split())
+            self.planets.append((idx, x, y, z))
+
+        self.roots = [x for x in range(self.n)]
+
+    def solve(self) -> None:
+        print(self.find_minimum_cost())
+
+    def find_minimum_cost(self) -> int:
+        edges, weight = self.find_edges(), 0
+
+        for distance, src, dest in edges:
+            if self.union(src, dest):
+                weight += distance
+
+        return weight
+
+    def find_edges(self) -> list[tuple[int, int, int]]:
+        edges = []
+        for axis in range(1, 4):
+            self.planets.sort(key=lambda planet: planet[axis])
+
+            for idx in range(self.n - 1):
+                edges.append(
+                    (
+                        abs(self.planets[idx][axis] - self.planets[idx + 1][axis]),
+                        self.planets[idx][0],
+                        self.planets[idx + 1][0],
+                    )
+                )
+
+        return sorted(edges)
+
+    def union(self, src: int, dest: int) -> bool:
+        src_root, dest_root = self.find_root(src), self.find_root(dest)
+        if src_root == dest_root:
+            return False
+
+        self.roots[src_root] = dest_root
+        return True
+
+    def find_root(self, num: int) -> int:
+        while num != self.roots[num]:
+            self.roots[num] = self.roots[self.roots[num]]
+            num = self.roots[num]
+
+        return num
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/2887/main.py

@@ -0,0 +1,15 @@
+[
+  {
+    "input": [
+      "5",
+      "11 -15 -15",
+      "14 -5 -15",
+      "-1 -1 -5",
+      "10 -4 -1",
+      "19 -4 19"
+    ],
+    "expected": [
+      "4"
+    ]
+  }
+]

baekjoon/python/2887/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()