Guess the Number Using Bitwise Questions II - Video Solutions

MediumBit ManipulationInteractive

Number of 1 Bits - Leetcode 191 - Python

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Guess the Number Using Bitwise Questions II - Video Solution

Watch 10 video solutions for Guess the Number Using Bitwise Questions II, a medium level problem involving Bit Manipulation, Interactive. This walkthrough by NeetCode has 155,494 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.

Problem Statement

There is a number n between 0 and 2³⁰ - 1 (both inclusive) that you have to find.

There is a pre-defined API int commonBits(int num) that helps you with your mission. But here is the challenge, every time you call this function, n changes in some way. But keep in mind, that you have to find the initial value of n.

commonBits(int num) acts as follows:

Calculate count which is the number of bits where both n and num have the same value in that position of their binary representation.
n = n XOR num
Return count.

Return the number n.

Note: In this world, all numbers are between 0 and 2³⁰ - 1 (both inclusive), thus for counting common bits, we see only the first 30 bits of those numbers.

Constraints:

0 <= n <= 2³⁰ - 1
0 <= num <= 2³⁰ - 1
If you ask for some num out of the given range, the output wouldn't be reliable.

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Problem Statement

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