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How to Solve Kth Missing Positive Number Problem
Master the Kth Missing Positive Number LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
Phantom Code AI generates complete solutions and debugging hints that you can use while explaining your approach, so you stay calm and in control.
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LeetCode ProblemKth Missing Positive Number
Given an array arr of positive integers sorted in a strictly increasing order, and an integer k. Return the kth positive integer that is missing from this array. Example 1: Example 2: Constraints: Follow up: Could you solve this problem in less than O(n) complexity?
ArrayBinary Search
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Problem Breakdown
Understanding the Kth Missing Positive Number Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given an array arr of positive integers sorted in a strictly increasing order, and an integer k. Return the kth positive integer that is missing from this array. Example 1: Example 2: Constraints: Follow up: Could you solve this problem in less than O(n) complexity?
EasyProblem #1539
LeetCodeKth Missing Positive Number
Related Topics
ArrayBinary Search
How Phantom Code AI Helps
Get real-time assistance for Kth Missing Positive Number problems during coding interviews. Phantom Code AI provides instant solutions and explanations.
Examples
# Example 1
Input
arr = [2,3,4,7,11], k = 5
Output
9
# Example 2
Input
arr = [1,2,3,4], k = 2
Output
6
Constraints
1 <= arr.length <= 1000
1 <= arr[i] <= 1000
1 <= k <= 1000
arr[i] < arr[j] for 1 <= i < j <= arr.length
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Solve Kth Missing Positive Number — Given an array arr of positive integers sorted in a strictly increasing order, a...
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 Missing Positive Number and using Phantom Code AI during coding interviews.
How does Phantom Code AI help me solve coding problems like Kth Missing Positive Number during interviews?
Phantom Code AI 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 Missing Positive Number?
Phantom Code AI 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 AI help me communicate my solution for problems like Kth Missing Positive Number?
Yes. Phantom Code AI 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 AI assist with different programming languages for Kth Missing Positive Number type problems?
Phantom Code AI 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 AI help me avoid during Kth Missing Positive Number interviews?
Phantom Code AI 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 AI detectable when solving problems like Kth Missing Positive Number during live interviews?
No. Phantom Code AI 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 AI help when I'm struggling with Kth Missing Positive Number 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 AI work for the coding platforms used in Kth Missing Positive Number interviews?
Yes. Phantom Code AI works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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