acm.jlu.edu.cn-1317-Tree Recovery

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

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

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

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

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

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

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

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