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HDU 1506 Largest Rectangle in a Histogram(DP)
可以发现 当第i-1个比第i个高的时候 比第i-1个高的所有也一定比第i个高 于是可以用到动态规划的思想 令left[i]表示包括i在内比i高的连续序列中最左边一个的编号 right[i]为最右边一个的编号 那么有 当h[left[i]-1]>=h[i]]时 left[i]=left[left[i]-1] 从前往后可以递推出left[i] 同理 当h[right[i]+1]>=h[i]]时 right[i]=right[right[i]+1] 从后往前可递推...
分类:其他好文   时间:2014-08-05 09:39:49    阅读次数:276
HDU 1506 Largest Rectangle in a Histogram
Problem Description A histogram is a polygon composed of a sequence of rectangles aligned at a common base line. The rectangles have equal widths but may have different heights. For example, the fi...
分类:其他好文   时间:2014-08-01 09:16:21    阅读次数:280
java 图片处理工具类
import java.awt.Image; import java.awt.Rectangle; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image...
分类:编程语言   时间:2014-07-31 16:14:36    阅读次数:338
HDU 1081 To The Max
DescriptionGiven a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous sub-array of size 1 x 1 or greater locat...
分类:其他好文   时间:2014-07-31 02:38:55    阅读次数:292
HDU 2830 Matrix Swapping II
Problem Description Given an N * M matrix with each entry equal to 0 or 1. We can find some rectangles in the matrix whose entries are all 1, and we define the maximum area of such rectangle as thi...
分类:移动开发   时间:2014-07-30 20:48:34    阅读次数:260
Maximum Subarray leetcode java
题目: Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array [?2,1,?3,4,?1...
分类:编程语言   时间:2014-07-30 05:34:43    阅读次数:319
HDU 2870 Largest Submatrix
这三道题的关系是这样的,1505是1506的加强版,2870又是1505的加强版如果按照上面由简到易的顺序来做的话,还是很简单的这道题的思想就是 枚举+DP因为某些字符可以变值,所以我们枚举a, b, c三个矩阵分别求出对应的h数组以及最大子矩阵,再在里面求出一个最大值即可。 1 //#define...
分类:其他好文   时间:2014-07-30 03:14:02    阅读次数:201
HDU 1506 Largest Rectangle in a Histogram
这个问题姑且也叫做最大子矩阵吧给一个树状图,求一个最大面积的子矩阵思路是这样的,对于每个单位矩阵,求出左边连续不比它低的矩阵的下标,放在l数组里同样,再求出右边连续的不比它低的矩阵的下标这样,对于每个单个矩阵所能得到的最大面积就是(r[i]-l[i]+1)*a[i] 1 //#define LOCA...
分类:其他好文   时间:2014-07-29 20:54:32    阅读次数:158
Topcoder 多校T-shirt场
盗用名字:C题题目都没看懂, B:You are given a long longn. Return the largest divisor ofnthat is a perfect square. That is, the correct return value is x if and ...
分类:其他好文   时间:2014-07-29 10:54:36    阅读次数:204
Maximal Rectangle leetcode java
题目:Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area.题解:这道题可以应用之前解过的Largetst Recta....
分类:编程语言   时间:2014-07-26 09:55:57    阅读次数:301
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