solved(python): baekjoon 2098

Author: himitery

baekjoon/python/2098/__init__.py

@@ -0,0 +1,39 @@
+import math
+import sys
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.n = int(read())
+        self.data = [list(map(int, read().split())) for _ in range(self.n)]
+
+    def solve(self) -> None:
+        dp = [[math.inf for _ in range(1 << self.n)] for _ in range(self.n)]
+        dp[0][1 << 0] = 0
+
+        for visited in range(1 << self.n):
+            for node in range(self.n):
+                if not (1 << node & visited):
+                    continue
+
+                for next_node, next_weight in enumerate(self.data[node]):
+                    if (1 << next_node) & visited or next_weight == 0:
+                        continue
+
+                    dp[next_node][visited | 1 << next_node] = min(
+                        dp[next_node][visited | 1 << next_node],
+                        next_weight + dp[node][visited],
+                    )
+
+        minimum = math.inf
+        for node in range(1, self.n):
+            if self.data[node][0] != 0:
+                minimum = min(minimum, dp[node][(1 << self.n) - 1] + self.data[node][0])
+
+        print(minimum)
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/2098/main.py

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+[
+  {
+    "input": [
+      "4",
+      "0 10 15 20",
+      "5 0 9 10",
+      "6 13 0 12",
+      "8 8 9 0"
+    ],
+    "expected": [
+      "35"
+    ]
+  },
+  {
+    "input": [
+      "4",
+      "0 7 3 3",
+      "7 0 9 2",
+      "1 9 0 12",
+      "7 7 12 0"
+    ],
+    "expected": [
+      "20"
+    ]
+  }
+]

baekjoon/python/2098/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()