mtry

摘要： Zero SumConsider the sequence of digits from 1 through N (where N=9) in increasing order:1 2 3 ... N.Now insert either a `+' for addition or a `-' for subtraction or a ` ' [blank] to run the digits together between each pair of digits (not in front of the first digit). Calculate the resu 阅读全文

摘要： Longest PrefixIOI'96The structure of some biological objects is represented by the sequence of their constituents, where each part is denote by an uppercase letter. Biologists are interested in decomposing a long sequence into shorter ones calledprimitives.We say that a sequence S can be compose 阅读全文