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How to Solve Find Kth Bit in Nth Binary String Problem
Master the Find Kth Bit in Nth Binary String LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#1545
LeetCode ProblemFind Kth Bit in Nth Binary String
Given two positive integers n and k, the binary string Sn is formed as follows: Where + denotes the concatenation operation, reverse(x) returns the reversed string x, and invert(x) inverts all the bits in x (0 changes to 1 and 1 changes to 0). For example, the first four strings in the above sequence are: Return the kth bit in Sn. It is guaranteed that k is valid for the given n.
StringRecursionSimulation
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Problem Breakdown
Understanding the Find Kth Bit in Nth Binary String Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given two positive integers n and k, the binary string Sn is formed as follows: Where + denotes the concatenation operation, reverse(x) returns the reversed string x, and invert(x) inverts all the bits in x (0 changes to 1 and 1 changes to 0). For example, the first four strings in the above sequence are: Return the kth bit in Sn. It is guaranteed that k is valid for the given n.
MediumProblem #1545
LeetCodeFind Kth Bit in Nth Binary String
Related Topics
StringRecursionSimulation
How Phantom Code Helps
Get real-time assistance for Find Kth Bit in Nth Binary String problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
n = 3, k = 1
Output
"0"
# Example 2
Input
n = 4, k = 11
Output
"1"
Constraints
1 <= n <= 20
1 <= k <= 2n - 1
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Solve Find Kth Bit in Nth Binary String — Given two positive integers n and k, the binary string Sn is formed as follows: ...
Here's the optimal approach using String:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Find Kth Bit in Nth Binary String and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Find Kth Bit in Nth Binary String during interviews?
Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Find Kth Bit in Nth Binary String?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code help me communicate my solution for problems like Find Kth Bit in Nth Binary String?
Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Find Kth Bit in Nth Binary String type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Find Kth Bit in Nth Binary String interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Find Kth Bit in Nth Binary String during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Find Kth Bit in Nth Binary String style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Find Kth Bit in Nth Binary String interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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