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[Coding Made Simple] Minimum Cost Path
Given a 2 dimensional matrix, find minimum cost path to reach bottom right from top left provided you can only from down and right. For a 5 * 5 matrix ...
分类:其他好文   时间:2017-08-26 10:12:34    阅读次数:121
方差variance, 协方差covariance, 协方差矩阵covariance matrix
参考: 如何通俗易懂地解释「协方差」与「相关系数」的概念?(非常通俗易懂) 浅谈协方差矩阵 方差(variance) 集合中各个数据与平均数之差的平方的平均数。在概率论与数理统计中,方差(Variance)用来度量随机变量和其数学期望(即均值)之间的偏离程度。 方差越大,数据的离散程度就越大。 协方... ...
分类:其他好文   时间:2017-08-25 21:37:29    阅读次数:179
读 Real-Time Rendering 收获
chapter 4. Transform p54 affine transform p57 all rotation matrices have a determinant of one and are orthogonal p59 scale,reflection matrix p62 Rigid ...
分类:其他好文   时间:2017-08-23 13:48:00    阅读次数:131
[Coding Made Simple] Sum Query in 2D Immutable Array
Given a 2D immutable array, Write an efficient program to support any given sub-rectangle sum query in this 2D matrix. A simple solution is to add eac ...
分类:其他好文   时间:2017-08-22 13:18:24    阅读次数:145
ML: 降维算法-PCA
PCA (Principal Component Analysis) 主成份分析 也称为卡尔胡宁-勒夫变换(Karhunen-Loeve Transform),是一种用于探索高维数据结构的技术。PCA通常用于高维数据集的探索与可视化。还可以用于数据压缩,数据预处理等。PCA可以把可能具有相关性的高维 ...
分类:编程语言   时间:2017-08-22 01:50:08    阅读次数:521
G - Rescue 【BFS+优先队列】
Angel was caught by the MOLIGPY! He was put in prison by Moligpy. The prison is described as a N * M (N, M <= 200) matrix. There are WALLs, ROADs, and ...
分类:其他好文   时间:2017-08-22 00:20:03    阅读次数:184
数塔 Medium
Summer is coming! It's time for Iahub and Iahubina to work out, as they both want to look hot at the beach. The gym where they go is a matrix a with n ...
分类:其他好文   时间:2017-08-21 21:56:51    阅读次数:302
POJ 3685 二分套二分
Given a N × N matrix A, whose element in the i-th row and j-th column Aij is an number that equals i2 + 100000 × i + j2 - 100000 × j + i × j, you are ...
分类:其他好文   时间:2017-08-21 21:56:33    阅读次数:280
华为机试练习代码
题目描述 查找两个字符串a,b中的最长公共子串。若有多个,输出在较短串中最先出现的那个。 输入描述: 输入两个字符串 输出描述: 返回重复出现的字符 示例1 输入 abcdefghijklmnop abcsafjklmnopqrstuvw 输出 jklmnop 查找两个字符串a,b中的最长公共子串。 ...
分类:其他好文   时间:2017-08-21 13:34:25    阅读次数:348
Code Force 429B Working out【递推dp】
Summer is coming! It's time for Iahub and Iahubina to work out, as they both want to look hot at the beach. The gym where they go is a matrix a with n ...
分类:其他好文   时间:2017-08-20 18:30:27    阅读次数:192
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