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How to Solve Kth Smallest Instructions Problem
Master the Kth Smallest Instructions LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#1643
LeetCode ProblemKth Smallest Instructions
Bob is standing at cell (0, 0), and he wants to reach destination: (row, column). He can only travel right and down. You are going to help Bob by providing instructions for him to reach destination. The instructions are represented as a string, where each character is either: Multiple instructions will lead Bob to destination. For example, if destination is (2, 3), both "HHHVV" and "HVHVH" are valid instructions. However, Bob is very picky. Bob has a lucky number k, and he wants the kth lexicographically smallest instructions that will lead him to destination. k is 1-indexed. Given an integer array destination and an integer k, return the kth lexicographically smallest instructions that will take Bob to destination.
ArrayMathDynamic ProgrammingCombinatorics
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Problem Breakdown
Understanding the Kth Smallest Instructions Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Bob is standing at cell (0, 0), and he wants to reach destination: (row, column). He can only travel right and down. You are going to help Bob by providing instructions for him to reach destination. The instructions are represented as a string, where each character is either: Multiple instructions will lead Bob to destination. For example, if destination is (2, 3), both "HHHVV" and "HVHVH" are valid instructions. However, Bob is very picky. Bob has a lucky number k, and he wants the kth lexicographically smallest instructions that will lead him to destination. k is 1-indexed. Given an integer array destination and an integer k, return the kth lexicographically smallest instructions that will take Bob to destination.
HardProblem #1643
LeetCodeKth Smallest Instructions
Related Topics
ArrayMathDynamic ProgrammingCombinatorics
How Phantom Code Helps
Get real-time assistance for Kth Smallest Instructions problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
destination = [2,3], k = 1
Output
"HHHVV"
# Example 2
Input
destination = [2,3], k = 2
Output
"HHVHV"
# Example 3
Input
destination = [2,3], k = 3
Output
"HHVVH"
Constraints
destination.length == 2
1 <= row, column <= 15
1 <= k <= nCr(row + column, row), where nCr(a, b) denotes a choose b.
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Solve Kth Smallest Instructions — Bob is standing at cell (0, 0), and he wants to reach destination: (row, column)...
Here's the optimal approach using Array:
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 Kth Smallest Instructions and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Kth Smallest Instructions 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 Kth Smallest Instructions?
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 Kth Smallest Instructions?
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 Kth Smallest Instructions 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 Kth Smallest Instructions 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 Kth Smallest Instructions 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 Kth Smallest Instructions 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 Kth Smallest Instructions 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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