1. Maximal Square 题目链接 题目要求: Given a 2D binary matrix filled with 0's and 1's, find the largest square containing all 1's and return its area. For example, given the following matrix: Return 4. 在GeeksforGeeks有一个解决该问题的方法: 1) Construct a sum matrix S[R…

Largest Rectangle in Histogram Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram. Above is a histogram where width of each bar is 1, given heigh…

https://leetcode.com/problems/largest-rectangle-in-histogram/ https://leetcode.com/problems/maximal-rectangle/ class Solution { public: int largestRectangleArea2(vector<int> height) { ) ; int ret = numeric_limits<int>::min(); ;i<height.size…

1. Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram. Above is a histogram where width of each bar is 1, given height = [2,1,5,6,2,3]. The large…

链接: https://leetcode.com/problems/maximal-rectangle/ [描述] Given a 2D binary matrix filled with '0's and '1's, find the largest rectangle containing all ones and return its area. [中文描述] 给一个二维数组, 算出里面最大的全1矩形面积,比如: [ ['1','1','1','0'], ['1','1','1','1']…

84题和85五题 基本是一样的,先说84题 84--柱状图中最大的矩形( Largest Rectangle in Histogram) 思路很简单,通过循环,分别判断第 i 个柱子能够延展的长度len,最后把len*heights[i] 就是延展开的面积,最后做比对,得出最大. public int largestRectangleArea(int[] heights) { int ans=0; for(int i=0;i<heights.length;i++) { int len=1,lef…

LeetCode 84. Largest Rectangle in Histogram 单调栈应用 leetcode+ 循环数组,求右边第一个大的数字 求一个数组中右边第一个比他大的数(单调栈 LeetCode--寻找数组中第三大的数…

Largest Rectangle in Histogram Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram. Above is a histogram where width of each bar is 1, given heigh…

Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram. Above is a histogram where width of each bar is 1, given height = [2,1,5,6,2,3]. The largest…

题目描述 给定 n 个非负整数,用来表示柱状图中各个柱子的高度.每个柱子彼此相邻,且宽度为 1 . 求在该柱状图中,能够勾勒出来的矩形的最大面积. 以上是柱状图的示例,其中每个柱子的宽度为 1,给定的高度为 [2,1,5,6,2,3]. 图中阴影部分为所能勾勒出的最大矩形面积,其面积为 10 个单位. 示例: 输入: [2,1,5,6,2,3] 输出: 10 解题思路 这道题跟LeetCode 11很相似,但是因为考虑柱子宽度,因此解题技巧不相同,此题考查单调栈的应用.我们首先在数组最后加入0,…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 单调栈 日期 题目地址: https://leetcode.com/problems/largest-rectangle-in-histogram/description/ 题目描述 Given n non-negative integers representing the histogram's bar height where the widt…

84. 柱状图中最大的矩形 84. Largest Rectangle in Histogram…

Largest Rectangle in Histogram Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram. Above is a histogram where width of each bar is 1, given heigh…

https://www.cnblogs.com/grandyang/p/4322653.html 1.存储一个单调递增的栈 2.如果你不加一个0进去,[1]这种情况就会输出结果0,而不是1 3.单调递增的栈,如果遇到比栈的top小的,就要计算一次.其实可以看到,这个top,从左向top是最大的,top向右也是最大的,所以只能乘以他自己. class Solution { public: int largestRectangleArea(vector<int>& heights) { s…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址: https://leetcode.com/problems/maximal-rectangle/description/ 题目描述: Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. Exa…

Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram. Above is a histogram where width of each bar is 1, given height = [2,1,5,6,2,3]. The largest…

之前切了道求解最大正方形的题,题解猛戳 这里.这道题 Maximal Rectangle 题意与之类似,但是解法完全不一样. 先来看这道题 Largest Rectangle in Histogram,如果暴力求解,可以枚举每个点为最小值,向两边扩展,复杂度 O(n^2).我们可以维护一个栈,从而将复杂度降低到 O(n),这个栈的思维非常巧妙,参考了 discuss,我是完全想不出来(或者说忘记了).具体代码可以猛戳 这里. 2016-08-07 补:stack 数组维护的是一个单调递增的数组,…

这两天在做leetcode的题目,最大矩形的题目以前遇到很多次了,一直都是用最笨的方法,扫描每个柱子,变换宽度,计算矩形面积,一直都以为就这样O(n2)的方法了,没有想到居然还有研究出了O(n)的算法,真是对GeeksForGeeks大神膜拜啊. 首先是Largest Rectangle in Histogram这个题目 class Solution { public: int largestRectangleArea(vector<int> &height) { int len=he…

Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. Example: Input: [ ["1","0","1","0","0"], ["1","0","1",&qu…

作者:jostree 转载请注明出处 http://www.cnblogs.com/jostree/p/4052343.html 题目链接 leetcode Largest Rectangle in Histogram 单调栈 对于每一个长条都向前找包含这个长条的最大面积使可行的,但是时间复杂度是O(n^2)大数据会超时.经过观察发现并不需要对每一个长条都向前查找,对于height[i],如果height[i+1]>height[i],那么就没有必要向前查找,原因是可以从height[i]查找到…

问题来源:Largest Rectangle in Histogram 问题描述:给定一个长度为n的直方图,我们可以在直方图高低不同的长方形之间画一个更大的长方形,求该长方形的最大面积.例如,给定下述直方图, 我们可以以高度5宽度2画一个更大的长方形,如下图,该长方形即是面积最大的长方形.该问题是难度比较大的问题,但是很出名,经常作为面试题出现.最近陈利人老师给出该问题的一个O(n)解法,非常巧妙,并从二维三维角度对问题进行了扩展.我们在陈老师的基础上,对该问题进行深入分析,给出多种方法,拓展大…

Maximal Rectangle Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area. 如果用DP来做,判断(begin1,end1)~(begin2,end2)范围是否全1,会超时. 对于矩阵matrix,逐行构建height数组,调用Largest Rectangle in Histogram即可. 对matr…

For example, Given height = [2,1,5,6,2,3], return 10. 解题思路: 参考Problem H: Largest Rectangle in a Histogram第四种思路,或者翻译版Largest Rectangle in Histogram@LeetCode,JAVA实现如下: public int largestRectangleArea(int[] height) { Stack<Integer> stk = new Stack<I…

一.题目说明 题目84. Largest Rectangle in Histogram,给定n个非负整数(每个柱子宽度为1)形成柱状图,求该图的最大面积.题目难度是Hard! 二.我的解答 这是一个 看起来容易,做起来很容易错的题目.我开始用的是"挖坑法",遗憾的是总是Time Limit Exceeded.经过10次优化,还是很难看. class Solution{ public: int largestRectangleArea(vector<int>& hei…

Given a rows x cols binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. Example 1: Input: matrix = [["1","0","1","0","0"],["1","0"…

题目: Largest Rectangle in Histogram Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram. Above is a histogram where width of each bar is 1, given h…

给定一个只含0和1的数组,求含1的最大矩形面积. Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area. 这样的题一般看来都是有O(n*m)的解法的. 借助上一题Largest Rectangle in Histogram 的解法. 我们现在把矩阵的每一行当做是上一题的问题,然后遍历所有的行数,取最大数就是解. 这里的…

在某篇博客见到的Largest Rectangle in Histogram的题目,感觉蛮好玩的,于是想呀想呀,怎么求解呢? 还是先把题目贴上来吧 题目写的很直观,就是找直方图的最大矩形面积,不知道是受之前的trie tree影响怎么的,感觉树这玩意还真有用,于是就思考呀,还真别说,真想出一种方式,好吧,其实是入了一个大坑,也无妨,记录下来,好歹也是思路历程..... 大概思路这样的: 每次寻找直方图的最小值,记录此时以该最小值,和以其为高度的矩形面积,再将直方图以该最小值为界限,将直方图分成若…

Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. For example, given the following matrix: 1 0 1 0 0 1 0 1 1 1 0 0 1 0 Return 6. [题目分析] 这个问题是要在一个0-1矩阵中找到由1构成的最大最大的矩阵的面积. [思路] 如何下手呢?…

Largest Rectangle in Histogram Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram. Above is a histogram where width of each bar is 1, given heigh…