solved(python): baekjoon 5670

Author: himitery

baekjoon/python/5670/__init__.py

@@ -0,0 +1,47 @@
+import sys
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.n = int(read())
+        self.words = [read() for _ in range(self.n)]
+
+    def solve(self) -> None:
+        total, trie = 0, self.make_trie()
+        for word in self.words:
+            total += self.count_keystrokes(word, trie)
+
+        print(f"{total / self.n:.2f}")
+
+    def make_trie(self) -> dict:
+        trie = {}
+
+        for word in self.words:
+            node = trie
+            for char in word:
+                node = node.setdefault(char, {})
+
+            node["*"] = True
+
+        return trie
+
+    def count_keystrokes(self, word: str, trie: dict) -> int:
+        strokes, node = 1, trie[word[0]]
+
+        for char in word[1:]:
+            if len(node) > 1 or "*" in node:
+                strokes += 1
+
+            node = node[char]
+
+        return strokes
+
+
+if __name__ == "__main__":
+    while True:
+        try:
+            Problem().solve()
+        except (EOFError, ValueError):
+            break

baekjoon/python/5670/main.py

@@ -0,0 +1,28 @@
+[
+  {
+    "input": [
+      "4",
+      "hello",
+      "hell",
+      "heaven",
+      "goodbye",
+      "3",
+      "hi",
+      "he",
+      "h",
+      "7",
+      "structure",
+      "structures",
+      "ride",
+      "riders",
+      "stress",
+      "solstice",
+      "ridiculous"
+    ],
+    "expected": [
+      "2.00",
+      "1.67",
+      "2.71"
+    ]
+  }
+]

baekjoon/python/5670/sample.json

@@ -0,0 +1,40 @@
+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,
+        ):
+            while True:
+                try:
+                    Problem().solve()
+                except StopIteration:
+                    break
+
+            result = output.getvalue().rstrip()
+
+        # Then
+        self.assertEqual("\n".join(expected), result)
+
+
+if __name__ == "__main__":
+    unittest.main()