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Notes About Singular Value Decomposition
A brief summary of SVD:An original matrix Amn is represented as a muliplication of three matrices: Amn = UmmSmnVnnTThe columns of Uare the orthonorma....
分类:其他好文   时间:2015-06-08 14:41:27    阅读次数:143
[leetcode] Maximal Square
Problem: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 follow...
分类:其他好文   时间:2015-06-07 23:31:41    阅读次数:123
面试题3:二维数组查找
1 bool Find(const int *matrix, int rows, int columns, int number) 2 { 3 int key; 4 int indexRow; 5 int indexCol; 6 7 /*合法性检查*/ 8 ...
分类:编程语言   时间:2015-06-07 17:15:24    阅读次数:118
LeetCode Maximal Square
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 matr...
分类:其他好文   时间:2015-06-07 14:34:37    阅读次数:198
codeforces Looksery Cup 2015 H Degenerate Matrix
The determinant of a matrix 2?×?2 is defined as follows: A matrix is called degenerate if its determinant is equal to zero. The norm ||A|| of a matrix A is defined as a maximum of absolute v...
分类:其他好文   时间:2015-06-07 13:52:04    阅读次数:121
【生成树计数】Matrix-tree定理学习笔记
学完了矩阵和行列式基础知识,终于可以去学矩阵数定理~(≧▽≦)/~———————————–线割分是我>w<———————————————– Matrix-tree定理,又叫Kirchhoff矩阵定理,于1847年首次被基尔霍夫先生证明,后来被广泛应用于生成树的计数问题. 要用它,需要先知道几个重要概念: 无向图的度数矩阵和邻接矩阵. 假定有无向图G,图中共有n个点. G的度数矩阵称D[G]...
分类:其他好文   时间:2015-06-07 09:49:37    阅读次数:314
codeforces Looksery Cup 2015 H Degenerate Matrix 二分 注意浮点数陷阱
#include #include #include #include #include #include using namespace std; bool fun(double l1,double r1,double l2,double r2){ return (l1 = l2) || (l2 >= l1 && l2 <= r1); } int main() { doub...
分类:其他好文   时间:2015-06-07 09:31:20    阅读次数:101
[LeetCode] Maximal Square
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:1 0 1 0 0 1 0 1 1 1 1 1 1 1 1 1 0 0 1 0Return...
分类:其他好文   时间:2015-06-06 14:59:51    阅读次数:138
Maximal Square
Problem: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 follow...
分类:其他好文   时间:2015-06-06 14:44:05    阅读次数:88
LeetCode Maximal Square
LeetCode Maximal Square题目思路思路还是很容易理解的,用DP; 令dp[i][j]表示以matrix[i][j]为正方形右下角的点时所能形成的最大面积; 公式显而易见,在代码中; 这题用宏定义定义MIN的时候犯了个错误耽误了很多时间; 那就是忘记加括号,要知道宏定义是直接替换;代码#define MIN(i, j) (i < j ? i : j)int maximalS...
分类:其他好文   时间:2015-06-06 09:08:58    阅读次数:93
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