Cpp环境【POJ3623】【Usaco2007Dec】【Vijos2993】Best Cow Line, Gold 最佳队列[2]

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POJ3623 Best Cow Line，Gold 原题

Description  问题描述

FJ is about to take his N (1 ≤ N ≤ 30,000) cows to the annual”Farmer of the Year” competition. In this contest every farmer arranges his cows in a line and herds them past the judges.
The contest organizers adopted a new registration scheme this year: simply register the initial letter of every cow in the order they will appear (i.e., If FJ takes Bessie, Sylvia, and Dora in that order he just registers BSD). After the registration phase ends, every group is judged in increasing lexicographic order according to the string of the initials of the cows’ names.
FJ is very busy this year and has to hurry back to his farm, so he wants to be judged as early as possible. He decides to rearrange his cows, who have already lined up, before registering them.
FJ marks a location for a new line of the competing cows. He then proceeds to marsh