28ms, 82%, 68%.

Author: Jeromestein

1009.complement-of-base-10-integer.py

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+#
+# @lc app=leetcode id=1009 lang=python3
+#
+# [1009] Complement of Base 10 Integer
+#
+
+# @lc code=start
+
+# Built-in Functions to Construct 1-bits Bitmask
+class Solution:
+    def bitwiseComplement(self, n: int) -> int:
+        if n == 0:
+            return 1
+        else:
+            return (1 << n.bit_length())-n-1
+
+# @lc code=end