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Search a 2D Matrix
Write an efficient algorithm that searches for a value in anmxnmatrix. This matrix has the following properties:Integers in each row are sorted from l...
分类:其他好文   时间:2014-10-07 15:03:53    阅读次数:130
Set Matrix Zeroes
Given amxnmatrix, if an element is 0, set its entire row and column to 0. Do it in place.click to show follow up.Follow up:Did you use extra space?A s...
分类:其他好文   时间:2014-10-07 12:03:03    阅读次数:231
UVA11992 - Fast Matrix Operations ( 线段树 + 区间修改 + 好题 )
UVA11992 - Fast Matrix Operations ( 线段树 + 区间修改 + 好题 )这是大白书上的例题,一直放着没有去A掉,这是一道线段树区间修改的好题。线段树中需要维护三个域 ,max, min, sum,也就是区间最大值,最小值,区间和题目大意:r 行 c 列 的全0矩阵,...
分类:其他好文   时间:2014-10-05 15:31:38    阅读次数:192
R: Hierarchical Cluster 层次聚类
构造数据: > dataset = matrix(c(1,2, + 1.2,2, + 8,9, + 0.9,1.8, + 7,10, + 8.8,9.2), nrow=6, byrow=T) > dataset [,1] [,2] [1,] 1.0 2.0 [2,] 1.2 2.0 [3,] 8.0 9.0 [4,] 0.9 1.8 [5,] 7.0 1...
分类:其他好文   时间:2014-10-05 15:27:28    阅读次数:373
R:Kmeans
例如要把一组数据分成两个簇: > dataset = matrix(c(1,2, + 1.2,2, + 8,9, + 0.9,1.8, + 7,10, + 8.8,9.2), nrow=6, byrow=T) > dataset [,1] [,2] [1,] 1.0 2.0 [2,] 1.2 2.0 [3,] 8.0 9.0 [4,] 0....
分类:其他好文   时间:2014-10-05 12:29:28    阅读次数:221
POJ3422 Kaka's Matrix Travels 【最大费用最大流】
Kaka's Matrix Travels Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8006   Accepted: 3204 Description On an N × N chessboard with a non-negative number i...
分类:其他好文   时间:2014-10-05 11:40:38    阅读次数:281
HDU 4307 Matrix 最小割 矩阵乘法展开
==线代好难 #include #include #include #include #include #include #include template inline bool rd(T &ret) { char c; int sgn; if(c=getchar(),c==EOF) return 0; while(c!='-'&&(c'9')...
分类:其他好文   时间:2014-10-05 01:27:37    阅读次数:293
R:从文本文件读取矩阵
在~下有一文本文件matrix.dat内容如下: 99 102 3 12 43 213.0 12 12 2 23 21 211 方式1: > A <- matrix(scan("~/matrix.dat", n = 3*4), 3, 4, byrow = TRUE) Read 12 items > A [,1] [,2] [,3] [,4] [1...
分类:其他好文   时间:2014-10-05 00:47:17    阅读次数:307
[ACM] POJ 3740 Easy Finding (DFS)
Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 16202   Accepted: 4349 Description Given a M×N matrix A. Aij ∈ {0, 1} (0 ≤ i < M, 0 ≤ j < N), could you find some ro...
分类:其他好文   时间:2014-10-03 22:39:25    阅读次数:275
[ACM] POJ 3740 Easy Finding (DLX模板题)
Easy Finding Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 16178   Accepted: 4343 Description Given a M×N matrix A. Aij ∈ {0, 1} (0 ≤ i < M, 0 ≤ j < N), co...
分类:其他好文   时间:2014-10-03 19:55:45    阅读次数:198
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