摘要：
A Scheduling Problem Description There is a set of jobs, say x1, x2,..., xn <tex2html_verbatim_mark>, to be scheduled. Each job needs one day to compl 阅读全文
摘要：
Choosing Capital for Treeland Description The country Treeland consists of n cities, some pairs of them are connected with unidirectional roads. Overa 阅读全文
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Walking Race Description flymouse’s sister wc is very capable at sports and her favorite event is walking race. Chasing after the championship in an i 阅读全文
摘要：
Fire Description Country Z has N cities, which are numbered from 1 to N. Cities are connected by highways, and there is exact one path between two dif 阅读全文