solved(python): baekjoon 1006

Author: himitery

baekjoon/python/1006/__init__.py

@@ -0,0 +1,76 @@
+import math
+import sys
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.n, self.w = map(int, read().split())
+        self.inner, self.outer = list(map(int, read().split())), list(map(int, read().split()))
+
+    def solve(self) -> None:
+        if self.n == 1:
+            print(2 - int(self.inner[0] + self.outer[0] <= self.w))
+            return
+
+        minimum = min(
+            self.find_minimum(
+                [[1, 1, 2 - int(self.inner[0] + self.outer[0] <= self.w)]] + [[0, 0, 0] for _ in range(self.n - 1)],
+                self.inner[:],
+                self.outer[:],
+            )[-1][2],
+            (
+                math.inf
+                if self.inner[-1] + self.inner[0] > self.w
+                else self.find_minimum(
+                    [[1, 1, 2]] + [[0, 0, 0] for _ in range(self.n - 1)],
+                    [math.inf] + self.inner[1:-1] + [math.inf],
+                    self.outer[:],
+                )[-1][1]
+            ),
+            (
+                math.inf
+                if self.outer[-1] + self.outer[0] > self.w
+                else self.find_minimum(
+                    [[1, 1, 2]] + [[0, 0, 0] for _ in range(self.n - 1)],
+                    self.inner[:],
+                    [math.inf] + self.outer[1:-1] + [math.inf],
+                )[-1][0]
+            ),
+            (
+                math.inf
+                if (self.inner[-1] + self.inner[0] > self.w) or (self.outer[-1] + self.outer[0] > self.w)
+                else self.find_minimum(
+                    [[1, 1, 2]] + [[0, 0, 0] for _ in range(self.n - 1)],
+                    [math.inf] + self.inner[1:-1] + [math.inf],
+                    [math.inf] + self.outer[1:-1] + [math.inf],
+                )[-2][2]
+            ),
+        )
+
+        print(minimum)
+
+    def find_minimum(self, dp: list[list[int]], inner: list[float], outer: list[float]) -> list[list[int]]:
+        for idx in range(1, self.n):
+            inner_count = 2 - int(inner[idx - 1] + inner[idx] <= self.w)
+            outer_count = 2 - int(outer[idx - 1] + outer[idx] <= self.w)
+            vertical_count = 2 - int(inner[idx] + outer[idx] <= self.w)
+
+            dp[idx] = [
+                min(dp[idx - 1][1] + inner_count, dp[idx - 1][2] + 1),
+                min(dp[idx - 1][0] + outer_count, dp[idx - 1][2] + 1),
+                min(
+                    dp[idx - 2][2] + inner_count + outer_count,
+                    dp[idx - 1][0] + outer_count + 1,
+                    dp[idx - 1][1] + inner_count + 1,
+                    dp[idx - 1][2] + vertical_count,
+                ),
+            ]
+
+        return dp
+
+
+if __name__ == "__main__":
+    for _ in range(int(read())):
+        Problem().solve()

baekjoon/python/1006/main.py

@@ -0,0 +1,13 @@
+[
+  {
+    "input": [
+      "1",
+      "8 100",
+      "70 60 55 43 57 60 44 50",
+      "58 40 47 90 45 52 80 40"
+    ],
+    "expected": [
+      "11"
+    ]
+  }
+]

baekjoon/python/1006/sample.json

@@ -0,0 +1,38 @@
+import json
+import os.path
+import sys
+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,
+        ):
+            for _ in range(int(sys.stdin.readline().rstrip())):
+                Problem().solve()
+
+            result = output.getvalue().rstrip()
+
+        # Then
+        self.assertEqual("\n".join(expected), result)
+
+
+if __name__ == "__main__":
+    unittest.main()