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How to Solve Find Number of Ways to Reach the K-th Stair Problem
Master the Find Number of Ways to Reach the K-th Stair LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#3154
LeetCode ProblemFind Number of Ways to Reach the K-th Stair
You are given a non-negative integer k. There exists a staircase with an infinite number of stairs, with the lowest stair numbered 0. Alice has an integer jump, with an initial value of 0. She starts on stair 1 and wants to reach stair k using any number of operations. If she is on stair i, in one operation she can: Return the total number of ways Alice can reach stair k. Note that it is possible that Alice reaches the stair k, and performs some operations to reach the stair k again.
MathDynamic ProgrammingBit ManipulationMemoizationCombinatorics
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Problem Breakdown
Understanding the Find Number of Ways to Reach the K-th Stair Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a non-negative integer k. There exists a staircase with an infinite number of stairs, with the lowest stair numbered 0. Alice has an integer jump, with an initial value of 0. She starts on stair 1 and wants to reach stair k using any number of operations. If she is on stair i, in one operation she can: Return the total number of ways Alice can reach stair k. Note that it is possible that Alice reaches the stair k, and performs some operations to reach the stair k again.
HardProblem #3154
LeetCodeFind Number of Ways to Reach the K-th Stair
Related Topics
MathDynamic ProgrammingBit ManipulationMemoizationCombinatorics
How Phantom Code Helps
Get real-time assistance for Find Number of Ways to Reach the K-th Stair problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
k = 0
Output
2
# Example 2
Input
k = 1
Output
4
Constraints
0 <= k <= 109
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Solve Find Number of Ways to Reach the K-th Stair — You are given a non-negative integer k. There exists a staircase with an infinit...
Here's the optimal approach using Math:
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 Number of Ways to Reach the K-th Stair and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Find Number of Ways to Reach the K-th Stair 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 Number of Ways to Reach the K-th Stair?
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 Number of Ways to Reach the K-th Stair?
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 Number of Ways to Reach the K-th Stair 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 Number of Ways to Reach the K-th Stair 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 Number of Ways to Reach the K-th Stair 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 Number of Ways to Reach the K-th Stair 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 Number of Ways to Reach the K-th Stair 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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