leetcode

commit 77f46021e62b1d16803e746db4a39d22d17700e2
parent 716c5f21d28b5fb06efd5cd637ae14056d1eead8
Author: Jack Sangdahl <jack@pngu.org>
Date:   Wed, 21 Aug 2024 18:52:54 -0600

476. number complement

Diffstat:
A
number_complement.c
 | 
16
++++++++++++++++
A
number_complement.py
 | 
26
++++++++++++++++++++++++++

2 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/number_complement.c b/number_complement.c
@@ -0,0 +1,16 @@
+// 476. Number Complement
+#include "leetcode.h"
+
+/*
+ * the complement of an integer is the integer you get when you flip all the 0's
+ * to 1's and all the 1's to 0's in its binary representation. for example, the
+ * integer 5 is "101" in binary and its complement is "010", which is the
+ * integer 2. given an integer 'num', return its complement
+ */
+
+int findComplement(int num) { return (uint)~0 >> __builtin_clz(num) ^ num; }
+
+int main() {
+  printf("%d\n", findComplement(5)); // expect: 2
+  printf("%d\n", findComplement(1)); // expect: 0
+}
diff --git a/number_complement.py b/number_complement.py
@@ -0,0 +1,26 @@
+# 476. Number Complement
+
+"""
+the complement of an integer is the integer you get when you flip all the 0's
+to 1's and all the 1's to 0's in its binary representation. for example, the
+integer 5 is "101" in binary and its complement is "010", which is the
+integer 2. given an integer 'num', return its complement
+"""
+
+
+class Solution(object):
+    def findComplement(self, num):
+        """
+        :type num: int
+        :rtype: int
+        """
+        i = 1
+        while i <= num:
+            i = i << 1
+        return (i - 1) ^ num
+
+
+if __name__ == "__main__":
+    obj = Solution()
+    print(obj.findComplement(5))
+    print(obj.findComplement(1))