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How to Solve Minimum Lines to Represent a Line Chart Problem

Master the Minimum Lines to Represent a Line Chart LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.

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Medium#2280

LeetCode Problem

Minimum Lines to Represent a Line Chart

You are given a 2D integer array stockPrices where stockPrices[i] = [dayi, pricei] indicates the price of the stock on day dayi is pricei. A line chart is created from the array by plotting the points on an XY plane with the X-axis representing the day and the Y-axis representing the price and connecting adjacent points. One such example is shown below: Return the minimum number of lines needed to represent the line chart.

ArrayMathGeometrySortingNumber Theory

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Problem Breakdown

Understanding the Minimum Lines to Represent a Line Chart Problem

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

Problem Statement

MediumProblem #2280

LeetCode

Minimum Lines to Represent a Line Chart

How Phantom Code Helps

Get real-time assistance for Minimum Lines to Represent a Line Chart problems during coding interviews. Phantom Code provides instant solutions and explanations.

Examples

# Example 1

Input

stockPrices = [[1,7],[2,6],[3,5],[4,4],[5,4],[6,3],[7,2],[8,1]]

Output

# Example 2

Input

stockPrices = [[3,4],[1,2],[7,8],[2,3]]

Output

Constraints

1 <= stockPrices.length <= 105

stockPrices[i].length == 2

1 <= dayi, pricei <= 109

All dayi are distinct.

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Solve Minimum Lines to Represent a Line Chart — You are given a 2D integer array stockPrices where stockPrices[i] = [dayi, price...

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

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Platform Compatibility

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Undetectability and technical details

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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 Minimum Lines to Represent a Line Chart and using Phantom Code during coding interviews.

How does Phantom Code help me solve coding problems like Minimum Lines to Represent a Line Chart 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 Minimum Lines to Represent a Line Chart?

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 Minimum Lines to Represent a Line Chart?

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 Minimum Lines to Represent a Line Chart 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 Minimum Lines to Represent a Line Chart 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 Minimum Lines to Represent a Line Chart 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 Minimum Lines to Represent a Line Chart 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 Minimum Lines to Represent a Line Chart 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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