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题目:It is necessary to arrange numbers from 0 to 2^(N+M)-1 in the matrix with 2^N rows and 2^M columns. Moreover, numbers occupying two adjacent cells ...
分类:其他好文   时间:2015-04-11 13:11:27    阅读次数:153
Rotate Image
You are given annxn2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Follow up:Could you do this in-place?solution:找规律 int[i]...
分类:其他好文   时间:2015-04-11 06:33:05    阅读次数:121
Leetcode: Search a 2D Matrix
题目: 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 from left to right. The first integer of...
分类:其他好文   时间:2015-04-11 00:03:23    阅读次数:132
Codeforces Round #236 (Div. 2)E. Strictly Positive Matrix(402E)
E. Strictly Positive MatrixYou have matrixaof sizen?×?n. Let's number the rows of the matrix from1tonfrom top to bottom, let...
分类:其他好文   时间:2015-04-10 22:25:42    阅读次数:209
UVA 11149-Power of Matrix (等比矩阵求和)
Problem B : Power of Matrix Time limit: 10 seconds Consider an n-by-n matrix A. We define Ak = A * A * ... * A (k times). Here, * denotes the usual matrix multiplication. You ar...
分类:其他好文   时间:2015-04-10 18:07:31    阅读次数:220
HDU 4965 Fast Matrix Calculation(利用矩阵运算性质)
题意:给出n*k的矩阵A和k*n的B,求(AB)^(n*n)结果矩阵中各元素模6 之和。(n 思路:A*B的矩阵是n*n(1000*1000)的矩阵,再快速幂肯定超时,用乘法结合律A^(N*N) * B^(N*N) = A*B*A*B*A*B*A··· = A*(B*A)*(B*A)···,以B*A的6*6的矩阵再快速幂即可 //62MS 1716K 1968 B C++ #inclu...
分类:其他好文   时间:2015-04-10 13:45:56    阅读次数:122
HDU 5015 233 Matrix (构造矩阵)
题意:给出矩阵的第0行(233,2333,23333,...)和第0列a1,a2,...an(n 数据范围:n,m(n ≤ 10,m ≤ 109).  思路:因为m ≤ 109 显然是要找到列与列的递推关系,用logn幂加速。 从递推式可以得知:a[i][j]可以由a[1...i][j-1] 递推得到,所以构造递推矩阵实现a[1...1][j-1]向a[1...1][j]的转移‘即可 #...
分类:其他好文   时间:2015-04-10 11:33:56    阅读次数:151
leetcode || 74、Search a 2D Matrix
problem: 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 from left to right.The f...
分类:其他好文   时间:2015-04-09 15:30:22    阅读次数:150
leetcode || 73、Set Matrix Zeroes
problem: Given a m x n matrix, 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 straight forward ...
分类:其他好文   时间:2015-04-09 12:00:06    阅读次数:138
记一道有意思的算法题Rotate Image(旋转图像)
题出自https://leetcode.com/problems/rotate-image/ 内容为: You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise)...
分类:编程语言   时间:2015-04-09 06:18:54    阅读次数:165
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