摘要：
Limited Permutation Problem Description As to a permutation p1,p2,⋯,pn from 1 to n, it is uncomplicated for each 1≤i≤n to calculate (li,ri) meeting th 阅读全文
摘要：
Hints of sd0061 Problem Description sd0061, the legend of Beihang University ACM-ICPC Team, retired last year leaving a group of noobs. Noobs have no 阅读全文