摘要： 不知道是不是我引起的话题，老赵出了个O1的面试题。 // Please write an sequence list implements the interface with the required // time complexity described in the comments. The users can add the same // element as many times as they want, but it doesn't support the null item. // You can use any types in .NET BCL but cannot use any 3rd party libraries. // PS: You don't need to consider the multi-threaded environment. 阅读全文