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How to Solve Count Square Submatrices with All Ones Problem
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Medium#1277
LeetCode ProblemCount Square Submatrices with All Ones
Given a m * n matrix of ones and zeros, return how many square submatrices have all ones.
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Problem Breakdown
Understanding the Count Square Submatrices with All Ones Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given a m * n matrix of ones and zeros, return how many square submatrices have all ones.
MediumProblem #1277
LeetCodeCount Square Submatrices with All Ones
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How PhantomCodeAI Helps
Get real-time assistance for Count Square Submatrices with All Ones problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.
Examples
# Example 1
Input
matrix = [ [0,1,1,1], [1,1,1,1], [0,1,1,1] ]
Output
15
# Example 2
Input
matrix = [ [1,0,1], [1,1,0], [1,1,0] ]
Output
7
Constraints
1 <= arr.length <= 300
1 <= arr[0].length <= 300
0 <= arr[i][j] <= 1
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Solve Count Square Submatrices with All Ones — Given a m * n matrix of ones and zeros, return how many square submatrices have ...
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 Count Square Submatrices with All Ones 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?
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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.
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