leetcode#42 Trapping rain water 这道题十分有意思,可以用很多方法做出来,每种方法的思想都值得让人细细体会. 42. Trapping Rain WaterGiven n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For ex…

leetcode - 42. Trapping Rain Water - Hard descrition Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1],…

LeetCode 42. Trapping Rain Water Python解法 解题思路: 本思路需找到最高点左右遍历,时间复杂度O(nlogn),以下为向左遍历的过程. 将每一个点的高度和索引存成一个元组 (val, idx) 找到最高的点(可能有多个,任取一个),记为 (now_val, now_idx). 向左找第一个val不大于now_val的点(left_val, left_idx). 以left_val作为水平面,用height[left_val+1, now_val-1]中每一…

Given an m x n matrix of positive integers representing the height of each unit cell in a 2D elevation map, compute the volume of water it is able to trap after raining. Note:Both m and n are less than 110. The height of each unit cell is greater tha…

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. The above elevation map is represented by array [0,1,0,2,1,0,1,3,2,1,2,1]. In this case, 6 units of…

Given an m x n matrix of positive integers representing the height of each unit cell in a 2D elevation map, compute the volume of water it is able to trap after raining. Note: Both m and n are less than 110. The height of each unit cell is greater th…

42. Trapping Rain Water Problem's Link ---------------------------------------------------------------------------- Mean: 在坐标上给你一些竖直放置的条形积木,问你这个积木能够容纳多少液体. analyse: 首先找出最高的积木,然后从前往后一直扫到最高积木,从后往前一直扫到最高积木,两部分体积相加即可. Time complexity: O(N) view code ;  …

Trapping Rain Water Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example,  Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. The above elevation ma…

题目要求:Trapping Rain Water Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. The above elevatio…

题目: Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. The above elevation map is represented…

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. The above elevation map is represented by a…

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. The above elevation map is represented by a…

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. The above elevation map is represented by a…

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. The above elevation map is represented by array [0,1,0,2,1,0,1,3,2,1,2,1]. In this case, 6 units of…

题意: Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example,  Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. watermark/2/text/aHR0cDovL2Jsb2cuY3Nkb…

我在Github上新建了一个解答Leetcode问题的Project, 大家可以参考, 目前是Java 为主,里面有leetcode上的题目,解答,还有一些基本的单元测试,方便大家起步. 题目在这里: https://leetcode.com/problems/trapping-rain-water/ [标签] Array; Stack; Two Pointers 这个题我感觉很难,我自己是完全不会.下面贴的是别人想到的好方法,自己适当做了些简单调整. 我觉得,这个解法非常巧妙的使用了双向的 t…

题目链接: https://leetcode.com/problems/trapping-rain-water/?tab=Description   Problem: 根据所给数组的值,按照上图的示意图.求解积水最大体积.     首先对所给数组进行遍历操作,求出最大高度所对应的下标为maxIndex   之后从左向右进行遍历,设置左边高度为leftMax 并初始化为 height[0],从i==1到i==maxIndex进行遍历.不断更新water,以及leftMax     当height[…

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. 我做题,一般是按照AC率排序选着做的,这道题一不留神,难度居然还是Hard,好吧,确实…

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. 解题思路: 先找到第一块最高的木板,然后从前向最高木板遍历,接着从后向最高木板遍历,J…

题目描述: Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. 解题思路: 思路一:开辟两个数组空间,逐个遍历数组,找出该位置左边的最大值…

https://leetcode.com/contest/6/problems/trapping-rain-water-ii/ 看到这题,我很高兴,因为我做过!哈哈!其实我现在也写不出来,知道大概思想. 这题是google apactest 2017 round A 的第二题.https://code.google.com/codejam/contest/11274486/dashboard#s=p1 然后,简单一次调试,就ac了.不知道这算不算作弊,做完,我就看见什么instruction,说…

题目链接:https://leetcode.com/problems/trapping-rain-water/description/ 思路: 1.先找到最左侧第一个高度不为0的柱子i. 2.从i+1开始向右侧找另一个柱子max.条件:要么a[max] > a[i],要么a[max] > 右侧所有. 1) 向右侧遍历,当遇到第一个比a[i]高的柱子,相当于遇到一座山,这个柱子会把左右两侧的池子给隔开. 所以,如果遇到第一个比a[i]高的柱子,就停下来.这时候就产生了一个和右侧隔开的池子. 2)…

这个题难点在于无法保证右边是不是有更高的墙可以保证挡住水 双指针可以解决 /* 两边指针保证,保证另外一边肯定有能挡住水的地方. 如果从一边开始,不考虑另一边,是无法保证右边肯定有挡水的墙,如果右边只都比这个值小,遍历的时候是不能增加结果的 双指针每次取较小的一方开始遍历 */ public int trap(int[] height) { if (height.length<3) return 0; int l = 0; int r = height.length-1; int res = 0…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 42: Trapping Rain Waterhttps://oj.leetcode.com/problems/trapping-rain-water/ Given n non-negative integers representing an elevation map where the width of each bar is 1,compute how much wa…

https://oj.leetcode.com/problems/trapping-rain-water/ Trapping Rain WaterGiven n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,…

Given an m x n matrix of positive integers representing the height of each unit cell in a 2D elevation map, compute the volume of water it is able to trap after raining. Note: Both m and n are less than 110. The height of each unit cell is greater th…

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. The above elevation map is represented by a…

这题放上来是因为自己第一回见到这种题,觉得它好玩儿 =) Trapping Rain Water Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], retu…

Container With Most Water 题目链接 Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Find two lines, which togeth…

Trapping Rain Water Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. The above elevation map…