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How to Solve Max Increase to Keep City Skyline Problem
Master the Max Increase to Keep City Skyline LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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LeetCode ProblemMax Increase to Keep City Skyline
There is a city composed of n x n blocks, where each block contains a single building shaped like a vertical square prism. You are given a 0-indexed n x n integer matrix grid where grid[r][c] represents the height of the building located in the block at row r and column c. A city's skyline is the outer contour formed by all the building when viewing the side of the city from a distance. The skyline from each cardinal direction north, east, south, and west may be different. We are allowed to increase the height of any number of buildings by any amount (the amount can be different per building). The height of a 0-height building can also be increased. However, increasing the height of a building should not affect the city's skyline from any cardinal direction. Return the maximum total sum that the height of the buildings can be increased by without changing the city's skyline from any cardinal direction.
ArrayGreedyMatrix
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Problem Breakdown
Understanding the Max Increase to Keep City Skyline Problem
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Problem Statement
There is a city composed of n x n blocks, where each block contains a single building shaped like a vertical square prism. You are given a 0-indexed n x n integer matrix grid where grid[r][c] represents the height of the building located in the block at row r and column c. A city's skyline is the outer contour formed by all the building when viewing the side of the city from a distance. The skyline from each cardinal direction north, east, south, and west may be different. We are allowed to increase the height of any number of buildings by any amount (the amount can be different per building). The height of a 0-height building can also be increased. However, increasing the height of a building should not affect the city's skyline from any cardinal direction. Return the maximum total sum that the height of the buildings can be increased by without changing the city's skyline from any cardinal direction.
MediumProblem #807
LeetCodeMax Increase to Keep City Skyline
Related Topics
ArrayGreedyMatrix
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Examples
# Example 1
Input
grid = [[3,0,8,4],[2,4,5,7],[9,2,6,3],[0,3,1,0]]
Output
35
# Example 2
Input
grid = [[0,0,0],[0,0,0],[0,0,0]]
Output
0
Constraints
n == grid.length
n == grid[r].length
2 <= n <= 50
0 <= grid[r][c] <= 100
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Solve Max Increase to Keep City Skyline — There is a city composed of n x n blocks, where each block contains a single bui...
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 Max Increase to Keep City Skyline and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Max Increase to Keep City Skyline 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 Max Increase to Keep City Skyline?
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.
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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.
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What coding mistakes does Phantom Code help me avoid during Max Increase to Keep City Skyline 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 Max Increase to Keep City Skyline during live interviews?
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How does Phantom Code help when I'm struggling with Max Increase to Keep City Skyline 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 Max Increase to Keep City Skyline 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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