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LeetCode题解,151道题完整版。广告:推荐刷题网站 https://www.lintcode.com/?utm_source=soulmachine
Add two number problem leetcode
我居然非常期待python版本
爬n阶楼梯有两种方法, 从n-1爬1步和n-2爬两步
Original method will return wrong position. 
In LRU Cache, after moving a node in the list to the front, it updated `cacheMap[key]` to `cacheList.begin()`. But I don't think the iterator to the node will be changed...