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74. Search a 2D Matrix (Graph; Divide-and-Conquer)
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 fr...
分类:其他好文   时间:2015-10-04 17:10:18    阅读次数:132
138. Copy List with Random Pointer (Graph, Map; DFS)
A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.Return a deep copy ...
分类:其他好文   时间:2015-10-04 17:10:15    阅读次数:140
54. Spiral Matrix (Graph)
Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. For example,Given the following matrix:[ [ 1,...
分类:其他好文   时间:2015-10-04 17:10:04    阅读次数:165
130. Surrounded Regions (Graph; DFS)
Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'.A region is captured by flipping all 'O's into 'X's in that surrounded ...
分类:其他好文   时间:2015-10-04 17:09:19    阅读次数:121
59. Spiral Matrix II (Graph)
Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example,Given n = 3,You should return the followin...
分类:其他好文   时间:2015-10-04 17:03:59    阅读次数:106
48. Rotate Image (Graph)
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?class Solution ...
分类:其他好文   时间:2015-10-04 15:52:14    阅读次数:154
118. Pascal's Triangle (Graph; WFS)
Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return[ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,...
分类:其他好文   时间:2015-10-04 15:52:13    阅读次数:244
codeforces 459E E. Pashmak and Graph(dp)
题目链接:codeforces 459E题目大意:给出n个点,m条边的有向图,每个边有边权,求一条最长的边权上升的路径的长度。题目分析: 定义dp[i]表示第i条边结尾的情况下的最长路径。 定义g[i]表示点i结尾的情况的最长路径。 对所有的边进行排序,那么前面的边只可能小于等于后面的边。 所以dp[i] = g[e[i].u]+1 然后只需要特殊考虑一下边相等的情况,更新g[i]即可,具体见代码...
分类:其他好文   时间:2015-10-03 12:00:07    阅读次数:191
hdu1845 Jimmy’s Assignment --- 完整匹配
意甲冠军:它需要一个特殊的图,以找到最大匹配。该图的特征是:无向图,度的每个节点3。这是一个双边连接组件(the graph is 2-edge-connected (that is, at least 2 edges need to be removed in order to make the ...
分类:其他好文   时间:2015-10-02 12:35:51    阅读次数:266
Graph Valid Tree
主要是看了这篇文章http://www.geeksforgeeks.org/union-find/总结下目前理解的Union-Find用在disjoint-set data structure上,disjoint-set keeps track of a set of elements partit...
分类:其他好文   时间:2015-09-29 06:38:18    阅读次数:178
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