845. 数组中的最长山脉
https://leetcode-cn.com/problems/longest-mountain-in-array/
解法一:
一次遍历,找山顶(比两端都高)。若找到,从山顶向两端发散,求山脉长度,每次更新最大长度。
class Solution:
def longestMountain(self, A: List[int]) -> int:
n = len(A)
maxL = 0
for i in range(n):
length = 0 #山脉长度
#找到山顶
if i-1 >= 0 and i+1 < n and A[i] > A[i-1] and A[i] > A[i+1]:
length += 1
left = right = i #山顶左右两侧指针
while left-1 >= 0 and A[left] > A[left-1]:
left -= 1
length += 1
while right+1 < n and A[right] > A[right+1]:
right += 1
length += 1
maxL = max(length, maxL)
return maxL
最后更新于