摘要：
DescriptionWe give the following inductive definition of a “regular brackets” sequence:the empty sequence is a regular brackets sequence,ifsis a regular brackets sequence, then (s) and [s] are regular brackets sequences, andifaandbare regular brackets sequences, thenabis a regular brackets sequence. 阅读全文
摘要：
DescriptionSome of you may have played a game called 'Blocks'. There are n blocks in a row, each box has a color. Here is an example: Gold, Silver, Silver, Silver, Silver, Bronze, Bronze, Bronze, Gold.The corresponding picture will be as shown below:Figure 1If some adjacent boxes are all of 阅读全文
摘要：
DescriptionBugs Integrated, Inc. is a major manufacturer of advanced memory chips. They are launching production of a new six terabyte Q-RAM chip. Each chip consists of six unit squares arranged in a form of a 2*3 rectangle. The way Q-RAM chips are made is such that one takes a rectangular plate of 阅读全文