acm.jlu.edu.cn-2005-The Dir Command

The Dir Command We all know the dos command "dir" . It can list the files in the computer . When we

You are to write an interpreter for a simple computer. This computer uses a processor with a small n

Tree Recovery Little Valentine liked playing with binary trees very much. Her favorite game was cons

Bob and Alice started to use a brand-new encoding scheme. Surprisingly it is not a Public Key Crypto

Pascal requires that real constants have either a decimal point, or an exponent (starting with the l

Maya Calendar During his last sabbatical, professor M. A. Ya made a surprising discovery about the o

System Overload Recently you must have experienced that when too many people use the BBS simultane

I know what you are thinking, "what does this have to do with Windows?". You may be aware

All in All You have devised a new encryption technique which encodes a message by inserting betwe

这个问题是一个关于加密和解密的问题，原题如下： Cryptography deals with methods of secret communication that transform a mes