前人的总结贴
http://blog.csdn.net/cqkxboy168/article/details/40464351
https://github.com/gaochengcheng/LeetCode/blob/master/Leetcode%E5%88%B7%E9%A2%98%E7%AC%94%E8%AE%B0%EF%BC%88%E9%93%BE%E8%A1%A8%E9%83%A8%E5%88%86%EF%BC%89.md