摘要：
Recommendation system predicts the preference that a user would give to an item. Now you are asked to program a very simple recommendation system that 阅读全文
摘要：
The task of this problem is simple: insert a sequence of distinct positive integers into a hash table, and output the positions of the input numbers. 阅读全文
摘要：
With highways available, driving a car from Hangzhou to any other city is easy. But since the tank capacity of a car is limited, we have to find gas s 阅读全文
摘要：
Given a sequence of K integers { N1, N2, ..., NK }. A continuous subsequence is defined to be { Ni, Ni+1, ..., Nj } where 1. The Max 阅读全文