solved(python): baekjoon 1647

Author: himitery

baekjoon/python/1647/__init__.py

@@ -0,0 +1,40 @@
+import heapq
+import sys
+from collections import defaultdict
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.n, self.m = map(int, read().split())
+        self.data = defaultdict(list)
+
+        for _ in range(self.m):
+            src, dest, cost = map(int, read().split())
+            self.data[src].append((cost, dest))
+            self.data[dest].append((cost, src))
+
+    def solve(self) -> None:
+        print(self.mst(1))
+
+    def mst(self, start_node: int) -> int:
+        queue, visited, costs, max_cost = ([(0, start_node)], set(), 0, 0)
+
+        while queue:
+            cost, node = heapq.heappop(queue)
+            if node in visited:
+                continue
+
+            visited.add(node)
+            costs, max_cost = costs + cost, max(max_cost, cost)
+
+            for new_cost, dest in self.data[node]:
+                if dest not in visited:
+                    heapq.heappush(queue, (new_cost, dest))
+
+        return costs - max_cost
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/1647/main.py

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+[
+  {
+    "input": [
+      "7 12",
+      "1 2 3",
+      "1 3 2",
+      "3 2 1",
+      "2 5 2",
+      "3 4 4",
+      "7 3 6",
+      "5 1 5",
+      "1 6 2",
+      "6 4 1",
+      "6 5 3",
+      "4 5 3",
+      "6 7 4"
+    ],
+    "expected": [
+      "8"
+    ]
+  }
+]

baekjoon/python/1647/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()