1762. Buildings With an Ocean View
单调栈
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.
The ocean is to the right of the buildings. A building has an ocean view if the building can see the ocean without obstructions. Formally, a building has an ocean view if all the buildings to its right have a smaller height.
Return a list of indices (0-indexed) of buildings that have an ocean view, sorted in increasing order.
Example 1:
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.
Example 2:
Input: heights = [4,3,2,1]
Output: [0,1,2,3]
Explanation: All the buildings have an ocean view.
Example 3:
Input: heights = [1,3,2,4]
Output: [3]
Explanation: Only building 3 has an ocean view.
Constraints:
1 <= heights.length <= 10
5
1 <= heights[i] <= 10
9
分析
单调栈
class Solution:
def findBuildings(self, heights: List[int]) -> List[int]:
stack = []
for i,h in enumerate(heights):
while stack and heights[stack[-1]] <= h:
stack.pop()
stack.append(i)
return stack
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