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How to Solve Find the Student that Will Replace the Chalk Problem
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Medium#1894
LeetCode ProblemFind the Student that Will Replace the Chalk
There are n students in a class numbered from 0 to n - 1. The teacher will give each student a problem starting with the student number 0, then the student number 1, and so on until the teacher reaches the student number n - 1. After that, the teacher will restart the process, starting with the student number 0 again. You are given a 0-indexed integer array chalk and an integer k. There are initially k pieces of chalk. When the student number i is given a problem to solve, they will use chalk[i] pieces of chalk to solve that problem. However, if the current number of chalk pieces is strictly less than chalk[i], then the student number i will be asked to replace the chalk. Return the index of the student that will replace the chalk pieces.
ArrayBinary SearchSimulationPrefix Sum
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Problem Breakdown
Understanding the Find the Student that Will Replace the Chalk Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
There are n students in a class numbered from 0 to n - 1. The teacher will give each student a problem starting with the student number 0, then the student number 1, and so on until the teacher reaches the student number n - 1. After that, the teacher will restart the process, starting with the student number 0 again. You are given a 0-indexed integer array chalk and an integer k. There are initially k pieces of chalk. When the student number i is given a problem to solve, they will use chalk[i] pieces of chalk to solve that problem. However, if the current number of chalk pieces is strictly less than chalk[i], then the student number i will be asked to replace the chalk. Return the index of the student that will replace the chalk pieces.
MediumProblem #1894
LeetCodeFind the Student that Will Replace the Chalk
Related Topics
ArrayBinary SearchSimulationPrefix Sum
How Phantom Code AI Helps
Get real-time assistance for Find the Student that Will Replace the Chalk problems during coding interviews. Phantom Code AI provides instant solutions and explanations.
Examples
# Example 1
Input
chalk = [5,1,5], k = 22
Output
0
# Example 2
Input
chalk = [3,4,1,2], k = 25
Output
1
Constraints
chalk.length == n
1 <= n <= 105
1 <= chalk[i] <= 105
1 <= k <= 109
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Solve Find the Student that Will Replace the Chalk — There are n students in a class numbered from 0 to n - 1. The teacher will give ...
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 Find the Student that Will Replace the Chalk and using Phantom Code AI during coding interviews.
How does Phantom Code AI help me solve coding problems like Find the Student that Will Replace the Chalk 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 Find the Student that Will Replace the Chalk?
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 Find the Student that Will Replace the Chalk?
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 Find the Student that Will Replace the Chalk 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 Find the Student that Will Replace the Chalk 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 Find the Student that Will Replace the Chalk 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 Find the Student that Will Replace the Chalk 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 Find the Student that Will Replace the Chalk 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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