代码随想录训练营Day59| 503.下一个更大元素II 42. 接雨水

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学习内容

 503.下一个更大元素II 

 42. 接雨水

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学习目标

•  503.下一个更大元素II 

•  42. 接雨水  

学习内容

 503.下一个更大元素II 

503. 下一个更大元素 II - 力扣（LeetCode）https://leetcode.cn/problems/next-greater-element-ii/

class Solution:
    def nextGreaterElements(self, nums: List[int]) -> List[int]:
        n = len(nums)
        stack = []
        res = [-1]*n
        for i in range(2*n):
            while stack and nums[stack[-1]]

 42. 接雨水

42. 接雨水 - 力扣（LeetCode）https://leetcode.cn/problems/trapping-rain-water/

class Solution:
    def trap(self, height: List[int]) -> int:
        #height = height[0]+height+height[-1]
        n = len(height)
        tmp = [0]*n
        a = 0
        for i in range(n):
            a = max(a,height[i])
            tmp[i]= a
        a = 0 
        for i in range(n-1,-1,-1):
            a = max(a,height[i])
            tmp[i]=min(tmp[i],a)
        res = sum(tmp)-sum(height)
        return res