How hard is LeetCode 1762. Buildings With an Ocean View?

LeetCode 1762. Buildings With an Ocean View is rated Medium on LeetCode.

What is the time complexity of LeetCode 1762. Buildings With an Ocean View?

The Python solution on this page runs in O(n), where n is the length of the array.

What is the space complexity of LeetCode 1762. Buildings With an Ocean View?

The Python solution on this page uses O(1) auxiliary space.

What topics does LeetCode 1762. Buildings With an Ocean View cover?

LeetCode 1762. Buildings With an Ocean View is tagged Stack, Array and Monotonic Stack on LeetCode.

Is LeetCode 1762. Buildings With an Ocean View a premium problem?

Yes. LeetCode 1762. Buildings With an Ocean View is a LeetCode Premium problem, so the full statement and test cases require a paid LeetCode subscription.

Buildings With an Ocean View — LeetCode 1762 Python Solution

MediumLeetCode PremiumStackArrayMonotonic Stack

Problem: #1762
Pattern: Stack
Reading time: 2 min
Source: leetcode.com

The problem

There are n buildings in a line. You are given an integer array heights of size n that represents the heights of the buildings in the line.

Example

Input: heights = [4,2,3,1]
Output: [0,2,3]
Explanation: Building 1 (0-indexed) does not have an ocean view because building 2 is taller.

Python solution

Python

class Solution:
    def findBuildings(self, heights: List[int]) -> List[int]:
        ans = []
        mx = 0
        for i in range(len(heights) - 1, -1, -1):
            if heights[i] > mx:
                ans.append(i)
                mx = heights[i]
        return ans[::-1]

Complexity

Measure	Complexity
Time	O(n), where n is the length of the array
Space	O(1) auxiliary

Pattern: Stack

When the most recent unresolved thing is the one that matters, use a stack. LeetCode 1762. Buildings With an Ocean View is filed here because LeetCode tags it Stack, which is the vocabulary this hub collects.

The stack guide has the Python template for the pattern and the 194 LeetCode problems that use it.

Frequently asked questions

How hard is LeetCode 1762. Buildings With an Ocean View?: LeetCode 1762. Buildings With an Ocean View is rated Medium on LeetCode.
What is the time complexity of LeetCode 1762. Buildings With an Ocean View?: The Python solution on this page runs in O(n), where n is the length of the array.
What is the space complexity of LeetCode 1762. Buildings With an Ocean View?: The Python solution on this page uses O(1) auxiliary space.
What topics does LeetCode 1762. Buildings With an Ocean View cover?: LeetCode 1762. Buildings With an Ocean View is tagged Stack, Array and Monotonic Stack on LeetCode.
Is LeetCode 1762. Buildings With an Ocean View a premium problem?: Yes. LeetCode 1762. Buildings With an Ocean View is a LeetCode Premium problem, so the full statement and test cases require a paid LeetCode subscription.