摘要： Compare two version numbers version1 and version2.If version1 > version2 return 1, if version1 < version2 return -1, otherwise return 0. You may assum 阅读全文

摘要： Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Try to solve it in linear time/space. Return 阅读全文

摘要： Given a sorted integer array where the range of elements are in the inclusive range [lower, upper], return its missing ranges. For example, given [0, 阅读全文

摘要： Given two strings S and T, determine if they are both one edit distance apart. 给定两个字符串，判断他们是否是一步变换得到的。 在这里需要注意几点： 1、不等于1的变换都要返回false（包括变换次数等于0)。 2、还有很 阅读全文

摘要： Given a string, find the length of the longest substring T that contains at most 2 distinct characters. For example, Given s = “eceba”, T is "ece" whi 阅读全文

摘要： The API: int read4(char *buf) reads 4 characters at a time from a file. The return value is the actual number of characters read. For example, it retu 阅读全文

摘要： The API: int read4(char *buf) reads 4 characters at a time from a file. The return value is the actual number of characters read. For example, it retu 阅读全文

摘要： 156. Binary Tree Upside Down Add to List QuestionEditorial Solution My Submissions 156. Binary Tree Upside Down Add to List QuestionEditorial Solution 阅读全文

摘要： java中调用commons.math3使用最小二乘法。 在这里记录一下使用方法。 阅读全文

摘要： 1.StringBuffer 与 StringBuilder a.执行速度：StringBuilder > StringBuffer =>　单线程操作大量数据 : StringBuilder b.StringBuilder:线程非安全的 StringBuffer :线程安全 => 多线程操作大量数据 阅读全文