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1009. Complement of Base 10 Integer

Description

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 n, return its complement.

 

Example 1:

Input: n = 5
Output: 2
Explanation: 5 is "101" in binary, with complement "010" in binary, which is 2 in base-10.

Example 2:

Input: n = 7
Output: 0
Explanation: 7 is "111" in binary, with complement "000" in binary, which is 0 in base-10.

Example 3:

Input: n = 10
Output: 5
Explanation: 10 is "1010" in binary, with complement "0101" in binary, which is 5 in base-10.

 

Constraints:

• 0 <= n < 109

 

Note: This question is the same as 476: https://leetcode.com/problems/number-complement/

Solutions

• Java
• C++
• Python
• Go

• class Solution {
      public int bitwiseComplement(int n) {
          if (n == 0) {
              return 1;
          }
          int ans = 0;
          boolean find = false;
          for (int i = 30; i >= 0; --i) {
              int b = n & (1 << i);
              if (!find && b == 0) {
                  continue;
              }
              find = true;
              if (b == 0) {
                  ans |= (1 << i);
              }
          }
          return ans;
      }
  }
  

• class Solution {
  public:
      int bitwiseComplement(int n) {
          if (n == 0) return 1;
          int ans = 0;
          bool find = false;
          for (int i = 30; i >= 0; --i) {
              int b = n & (1 << i);
              if (!find && b == 0) continue;
              find = true;
              if (b == 0) ans |= (1 << i);
          }
          return ans;
      }
  };
  

• class Solution:
      def bitwiseComplement(self, n: int) -> int:
          if n == 0:
              return 1
          ans = 0
          find = False
          for i in range(30, -1, -1):
              b = n & (1 << i)
              if not find and b == 0:
                  continue
              find = True
              if b == 0:
                  ans |= 1 << i
          return ans
  
  

• func bitwiseComplement(n int) int {
  	if n == 0 {
  		return 1
  	}
  	ans := 0
  	find := false
  	for i := 30; i >= 0; i-- {
  		b := n & (1 << i)
  		if !find && b == 0 {
  			continue
  		}
  		find = true
  		if b == 0 {
  			ans |= (1 << i)
  		}
  	}
  	return ans
  }
  

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