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How to Solve Delete Columns to Make Sorted Problem
Master the Delete Columns to Make Sorted LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsEasy#944
LeetCode ProblemDelete Columns to Make Sorted
You are given an array of n strings strs, all of the same length. The strings can be arranged such that there is one on each line, making a grid. You want to delete the columns that are not sorted lexicographically. In the above example (0-indexed), columns 0 ('a', 'b', 'c') and 2 ('c', 'e', 'e') are sorted, while column 1 ('b', 'c', 'a') is not, so you would delete column 1. Return the number of columns that you will delete.
ArrayString
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Problem Breakdown
Understanding the Delete Columns to Make Sorted Problem
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Problem Statement
You are given an array of n strings strs, all of the same length. The strings can be arranged such that there is one on each line, making a grid. You want to delete the columns that are not sorted lexicographically. In the above example (0-indexed), columns 0 ('a', 'b', 'c') and 2 ('c', 'e', 'e') are sorted, while column 1 ('b', 'c', 'a') is not, so you would delete column 1. Return the number of columns that you will delete.
EasyProblem #944
LeetCodeDelete Columns to Make Sorted
Related Topics
ArrayString
How Phantom Code Helps
Get real-time assistance for Delete Columns to Make Sorted problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
—
Output
—
# Example 2
Input
strs = ["cba","daf","ghi"]
Output
1
# Example 3
Input
strs = ["a","b"]
Output
0
# Example 4
Input
strs = ["zyx","wvu","tsr"]
Output
3
Constraints
n == strs.length
1 <= n <= 100
1 <= strs[i].length <= 1000
strs[i] consists of lowercase English letters.
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Solve Delete Columns to Make Sorted — You are given an array of n strings strs, all of the same length. The strings ca...
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 Delete Columns to Make Sorted and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Delete Columns to Make Sorted 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 Delete Columns to Make Sorted?
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 Delete Columns to Make Sorted?
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 Delete Columns to Make Sorted 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 Delete Columns to Make Sorted 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 Delete Columns to Make Sorted 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 Delete Columns to Make Sorted 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 Delete Columns to Make Sorted 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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