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Problem Path Sum II
Problem Description:Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.Solution: 递归。 1 public List>...
分类:其他好文   时间:2014-07-07 16:59:12    阅读次数:169
Problem Max Points On a Line
Problem Description:Givennpoints on a 2D plane, find the maximum number of points that lie on the same straight line.Solution: 1 public int maxPoint.....
分类:其他好文   时间:2014-07-07 16:55:19    阅读次数:281
Problem Single Number II
Problem Description:Given an array of integers, every element appearsthreetimes except for one. Find that single one.Solution:1 Arrays.sort(A...
分类:其他好文   时间:2014-07-07 16:10:04    阅读次数:174
Minimum Path Sum
题目 Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path. Note: You can only move either down...
分类:其他好文   时间:2014-06-30 11:10:34    阅读次数:211
POJ1258 Agri-Net MST最小生成树题解
搭建一个最小代价的网络,最原始的最小生成树的应用。 这里使用Union find和Kruskal算法求解. 注意: 1 给出的数据是原始的矩阵图,但是需要转化为边表示的图,方便运用Kruskal,因为需要sort 2 减少边,一个矩阵最多需要(N*N-N)>>1条边,有人讨论本题是否有向,那是无意义的,因为本题的最小生成树和方向无关。 3 使用Union find是为了判断是否有环,比原...
分类:Web程序   时间:2014-06-30 08:10:08    阅读次数:200
Median of Two Sorted Arrays
题目 There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). 方法 转换为寻找第k大的数。 ...
分类:其他好文   时间:2014-06-30 06:05:58    阅读次数:261
Edit Distance
题目 Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitte...
分类:其他好文   时间:2014-06-30 00:46:38    阅读次数:262
leetCode: Single Number II [137]
【题目】 Given an array of integers, every element appears three times except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? 【题意】 给定一个整数以外,其中除了一个整数只出现一次以外...
分类:其他好文   时间:2014-06-29 22:52:35    阅读次数:246
linux find命令强大之处
find命令 find pathname -options [-print -exec -ok ...]   -print: find命令将匹配的文件输出到标准输出。   -exec: find命令对匹配的文件执行该参数所给出的shell命令。相应命令的形式为'command' { } \;,注意{ }和\;之间的空格。   -ok: 和-exec的作用相同,只不过以一种更...
分类:系统相关   时间:2014-06-29 20:48:34    阅读次数:355
Minimum Window Substring
题目 Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n). For example, S = "ADOBECODEBANC" T = "ABC" Minimum wi...
分类:Windows程序   时间:2014-06-29 20:38:14    阅读次数:239
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