Given two Integer numbers x and y. Compare and print which one of them has more leading zeros using Bitwise operation. If both the no. has same no. of leading zeros, print “Equal”.
Note:- A leading zero is any 0 digit that comes before the first nonzero digit in the binary notation of the number.
Input : 10, 16 Output :10 Explanation: If we represent the no.s using 8 bit only then Binary(10) = 00001010 Binary(16) = 00010000 Clearly, 10 has 4 leading zeros and 16 has 3 leading zeros Input : 10, 12 Output : Equal Binary(10) = 00001010 Binary(12) = 00001100 Both have equal no. of leading zeros.
Solution 1 : The Naive approach is to first find the binary representation of the numbers and then count the no. of leading zeros.
Solution 2 : Find largest power of twos smaller than given numbers, and compare these powers of twos to decide answer.
Solution 3: An efficient approach is to bitwise XOR and AND operators.
Case 1: If both have same no. of leading zeros then (x^y) <= (x & y) because same number of leading 0s would cause a 1 at higher position in x & y.
Case 2 : If we do negation of y and do bitwise AND with x, we get a one at higher position than in y when y has more number of leading 0s.
Case 3: Else x has more leading zeros
Time Complexity: O(1)
Space Complexity: O(1)
- Count of N-bit binary numbers without leading zeros
- Number of leading zeros in binary representation of a given number
- Check if binary representations of two numbers are anagram
- XOR of two numbers after making length of their binary representations equal
- Count number of trailing zeros in Binary representation of a number using Bitset
- 1 to n bit numbers with no consecutive 1s in binary representation
- 1 to n bit numbers with no consecutive 1s in binary representation.
- Fibbinary Numbers (No consecutive 1s in binary)
- Fibbinary Numbers (No consecutive 1s in binary) - O(1) Approach
- First element greater than or equal to X in prefix sum of N numbers using Binary Lifting
- Bitwise AND of the sum of prime numbers and the sum of composite numbers in an array
- Meta Binary Search | One-Sided Binary Search
- Absolute difference between the XOR of Non-Prime numbers and Prime numbers of an Array
- Gray to Binary and Binary to Gray conversion
- Bitwise AND of N binary strings
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