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Hi Everyone, this is the 138th video of our Playlist "Leetcode Easy : Popular Interview Problems".
Now we will be solving a simple bit magic related problem - Binary Number with Alternating Bits | 3 Approaches | Detailed | Leetcode 693 | codestorywithMIK

Problem Name : Binary Number with Alternating Bits | 3 Approaches | Detailed | Leetcode 693 | codestorywithMIK
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Video Summary :
Approach-1 (Direct Adjacent Comparison)
Traverse the binary representation and compare every pair of adjacent bits. If any two neighboring bits are the same, the number does not have alternating bits.

Approach-2 (Extract and Compare Last Bit)
Keep removing the last bit and compare it with the previous one. As soon as two consecutive extracted bits match, the pattern breaks.

Approach-3 (XOR Pattern Trick)
If bits are alternating, XORing the number with its right-shifted version produces a sequence of all 1s. Then we simply verify whether the result is of the form 111..., which confirms alternating in constant time.



✨ Timelines✨
00:00 - Introduction
00:07 - Motivation
00:30 - Problem Explanation
00:58 - Approach-1
06:30 - Approach-2
09:28 - Approach-1
16:08 - Showing the code
16:57 - Approach-3 Corner Case

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