原題: In the movie “Die Hard 3”, Bruce Willis and Samuel L. Jackson were confronted with the following puzzle. They were given a 3-gallon jug and a 5-gallon jug and were asked to fill the 5-gallon jug with exactly 4 gallons. This problem generalizes
原題: Little Valentine liked playing with binary trees very much. Her favorite game was constructing randomly looking binary trees with capital letters in the nodes. This is an example of one of her creations: To record her trees for future
序列 序列(sequence)是一組排好序的項集,不一定是直接連續的,但依然滿足次序。序列模式的元素還可以是一個項集,如一組頁面序列。序列模式挖掘比關聯挖掘能得到更深刻的知識。 序列模式 sequence patternmining,針對Frequent Sequences,典型的應用還是限於離散型的序列,happens-after relationship and not just the consecutive subsequences。
A factory produces products packed in square packets of the same height h and of the sizes 1*1 , 2*2 ,3*3 , 4*4 , 5*5 , 6*6 . These products are always delivered to customers in the square parcels of the same height h as the products have and of the
原題: There is a famous railway station in PopPush City. Country there is incredibly hilly. The station was built in last century. Unfortunately, funds were extremely limited that time. It was possible to establish only a surface track. Moreover,
以下內容轉載自:http://blog.csdn.net/yohohohoho/article/details/6735066 作用:保證此時沒有其他線程對self對象進行修改 Using the @synchronized Directive The @synchronized directive is a convenient way to create mutex locks on the fly in
原題: There is a town with N citizens. It is known that some pairs of people are friends. According to the famous saying that “The friends of my friends are my friends, too” it follows that if A and B are friends and B and C are friends then A and C