摘要：
Given a collection of intervals, merge all overlapping intervals. For example, Given [1,3],[2,6],[8,10],[15,18], return [1,6],[8,10],[15,18]. 思路1：现将左右 阅读全文
摘要：
Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 思路：参考：http://www.cnblogs.com/zuoyuan/p/3772372.html 阅读全文
摘要：
Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 思路：先建立一个对应的dict。注意转换规则中的特例，比如XL (=50-10), 阅读全文