Top Problems on Bit Manipulation for Interviews

This topic focuses on operations involving binary numbers and bitwise operators, which can lead to highly efficient solutions for complex problems. Bit manipulation often offers optimized time and space complexity, especially in algorithms involving large datasets, arrays, or numbers.

Common operations like AND, OR, XOR, and NOT allow you to manipulate individual bits within integers, providing a powerful toolkit for solving problems such as detecting duplicates, counting set bits, or performing arithmetic operations efficiently. Whether it's finding the missing number in a sequence or optimizing space in data structures, bit manipulation techniques can significantly improve your problem-solving approach in coding interviews.

Easy Problems

• Binary Representation
• Turn off the rightmost set bit
• Check if K-th Bit Set
• Set the K-th Bit
• Modulus division by 2's Power
• Odd Occurring Number
• Power of two
• The only set bit
• Add Bit Strings
• Check for Integer Overflow
• XOR without using XOR
• Check for Equal
• Check for opposite signs
• Swap Two Numbers
• Russian Peasant

Medium Problems

• Most Significant Set Bit
• Rightmost Set Bit
• Count Set Bits
• Swap Bits
• Rotate Bits
• Smallest of Three
• Minimum without branching
• Smallest power of 2 greater than or equal to n
• Program to find parity
• Check if binary is palindrome
• Generate n-bit Gray Codes
• Check for Sparse
• Euclid when % and / are costly
• Square without using *, / and pow()
• Cyclic Redundancy Check and Modulo-2 Division
• Set Bits in a Range
• Check for Bleak
• Gray to Binary and Vice Versa

Hard Problems

• Next higher with same set bits
• Karatsuba Algorithm for fast Multiplication
• Max Subarray XOR
• Longest Sequence of 1’s in Binary with One Flip
• Closest Smaller and greater with same set bits
• Bitmasking and Dynamic Programming
• Compute the Parity
• XOR Encryption by Shifting Plaintext
• Count pairs with at least one digit common
• Floating to Binary
• Booth’s Multiplication Algorithm
• Pairs with Pandigital Concatenation
• n-th number whose binary is a palindrome
• Two non-repeating in an array of repeating