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311. Sparse Matrix Multiplication
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分类:其他好文   时间:2016-07-05 06:24:11    阅读次数:500
递增矩阵的查找
确定一个数是否存在于递增型矩阵中: bool FindInMatrixFromTopRightCorner(int(*Matrix)[5], int Row, int Find) { int i = 0, j = 4, tmp = Matrix[0][4]; while (i <= 4) { if ...
分类:其他好文   时间:2016-07-04 20:33:10    阅读次数:144
transform
transform:none|rotate|scale|skew|translate|matrix;(以空格分开) none:不进行转换; rotate:旋转。正数是顺时针旋转,负数为逆时针旋转。如transform:rotate(45deg); scale:缩放。scale(x,y)水平,垂直同时 ...
分类:其他好文   时间:2016-07-02 18:52:18    阅读次数:135
221. Maximal Square java solutions
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 mat ...
分类:编程语言   时间:2016-07-02 15:49:17    阅读次数:141
304. Range Sum Query 2D - Immutable java solutions
Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2 ...
分类:编程语言   时间:2016-07-01 15:54:44    阅读次数:166
反射矩阵(reflection matrix)推导
设平面为(nx,ny,nz,d),则以此平面为镜面的列主序反射矩阵如下: 推导如下: 一,平台的表示: 如图所示,过点p,法向量为n的平面,可表示为: np+d=0 其中d为平面到原点的有向距离。如果平面面向原点,则d为正,如果平面背向原点,则d为负。 于是平面可以表示为四维向量(nx,ny,nz, ...
分类:其他好文   时间:2016-06-30 20:00:44    阅读次数:233
74. Search a 2D Matrix java solutions
Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted f ...
分类:编程语言   时间:2016-06-28 10:58:59    阅读次数:187
48. Rotate Image java solutions
You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Follow up:Could you do this in-place? 题目大意是将矩阵做就地顺 ...
分类:编程语言   时间:2016-06-27 19:47:14    阅读次数:192
1374 - Confusion in the Problemset
1374 - Confusion in the Problemset PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB A small confusion in a problem set may r ...
分类:其他好文   时间:2016-06-27 17:39:34    阅读次数:269
240. Search a 2D Matrix II java solutions
Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted i ...
分类:编程语言   时间:2016-06-27 15:37:58    阅读次数:128
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