solved(python): baekjoon 15824

Author: himitery

baekjoon/python/15824/__init__.py

@@ -0,0 +1,27 @@
+import sys
+
+read = lambda: sys.stdin.readline().rstrip()
+
+
+class Problem:
+    def __init__(self):
+        self.n = int(read())
+        self.data = sorted(list(map(int, read().split())))
+
+        self.mod = 1_000_000_007
+
+    def solve(self) -> None:
+        cached = [1 for _ in range(self.n)]
+        for idx in range(1, self.n):
+            cached[idx] = (cached[idx - 1] * 2) % self.mod
+
+        answer = 0
+        for idx in range(self.n):
+            answer += self.data[idx] * (cached[idx] - cached[self.n - idx - 1])
+            answer %= self.mod
+
+        print(answer)
+
+
+if __name__ == "__main__":
+    Problem().solve()

baekjoon/python/15824/main.py

@@ -0,0 +1,20 @@
+[
+  {
+    "input": [
+      "3",
+      "5 2 8"
+    ],
+    "expected": [
+      "18"
+    ]
+  },
+  {
+    "input": [
+      "6",
+      "1 4 5 5 6 10"
+    ],
+    "expected": [
+      "307"
+    ]
+  }
+]

baekjoon/python/15824/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()