摘要：
A vertex cover of a graph is a set of vertices such that each edge of the graph is incident to at least one vertex of the set. Now given a graph with 阅读全文
摘要：
Given a singly linked list, you are supposed to rearrange its elements so that all the negative values appear before all of the non-negatives, and all 阅读全文
摘要：
Cutting an integer means to cut a K digits lone integer Z into two integers of (K/2) digits long integers A and B. For example, after cutting Z = 1673 阅读全文