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How to Solve Find All Good Indices Problem

Master the Find All Good Indices LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.

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Medium#2420
LeetCode Problem

Find All Good Indices

You are given a 0-indexed integer array nums of size n and a positive integer k. We call an index i in the range k <= i < n - k good if the following conditions are satisfied: Return an array of all good indices sorted in increasing order.

ArrayDynamic ProgrammingPrefix Sum

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Problem Breakdown

Understanding the Find All Good Indices Problem

Let's break down this LeetCode problem and understand what makes it challenging in interview settings.

Problem Statement

You are given a 0-indexed integer array nums of size n and a positive integer k. We call an index i in the range k <= i < n - k good if the following conditions are satisfied: Return an array of all good indices sorted in increasing order.

MediumProblem #2420
LeetCode

Find All Good Indices

Related Topics

ArrayDynamic ProgrammingPrefix Sum

How PhantomCodeAI Helps

Get real-time assistance for Find All Good Indices problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.

Examples

# Example 1

Input
nums = [2,1,1,1,3,4,1], k = 2
Output
[2,3]

# Example 2

Input
nums = [2,1,1,2], k = 2
Output
[]

Constraints

n == nums.length
3 <= n <= 105
1 <= nums[i] <= 106
1 <= k <= n / 2

How PhantomCodeAI Helps with LeetCode Problems

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Solve Find All Good Indices — You are given a 0-indexed integer array nums of size n and a positive integer k....

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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Undetectability Checklist

Run compatibility test before interviews
Use recommended Zoom version settings
Enable advanced screen capture options
Verify native desktop architecture
Test with screen recording software

Platform Compatibility

Zoom
Supported
Google Meet
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HackerRank
Supported
CodeSignal
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CoderPad
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Teams
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User results and traction

Thousands of developers use PhantomCodeAI. Social proof signals that this approach helps real candidates land offers across a range of companies.

Undetectability and technical details

Our native desktop architecture avoids common detection vectors used by browser extensions. We provide a clear checklist so you can run basic checks and confirm the app will be invisible.

Platform compatibility and limitations

We work with Zoom, HackerRank, CodeSignal, CoderPad and other web-based platforms. Check the compatibility note and request a browser link if a specific desktop app is unsupported.

Frequently Asked Questions

Common questions about solving Find All Good Indices and using PhantomCodeAI during coding interviews.

How does PhantomCodeAI help with LeetCode problems during a coding interview?
PhantomCodeAI reads the problem from a screenshot or listens to it via audio, then generates a complete solution with a step-by-step approach and time/space complexity, so you can focus on explaining your reasoning rather than getting stuck on implementation.
Which programming languages does PhantomCodeAI support?
11 languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set a preferred language to get idiomatic solutions.
Does PhantomCodeAI work with HackerRank, CodeSignal, and CoderPad?
Yes — it works alongside LeetCode, HackerRank, CodeSignal, CoderPad, and HackerEarth, plus any browser-based coding environment.
Can PhantomCodeAI handle follow-up questions and modifications?
Yes. Capture the modified problem by screenshot or audio and get an updated solution within seconds, including new edge cases and optimizations.
Is PhantomCodeAI detectable during live interviews?
PhantomCodeAI runs as a native desktop overlay that does not appear in screen shares, recordings, or proctoring software, and works with Zoom, Google Meet, Microsoft Teams, and major coding platforms.
Should I still practice these problems on my own first?
Yes. The most durable preparation is solving problems unaided first, then using AI afterward to review your approach, complexity, and missed edge cases — use it to debrief and learn, not to skip the reps.

Related LeetCode Problems

Practice more problems similar to Find All Good Indices.

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← Previous Longest Subarray With Maximum Bitwise ANDNext → Number of Good Paths
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