After the data structures exam, students lined up in the cafeteria to have a drink and chat about how much they have enjoyed the exam and how good their professors are. Since it was late in the evening, the cashier has already closed the cash registe…
题目链接: Gym Class Time Limit: 6000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) Problem Description 众所周知,度度熊喜欢各类体育活动. 今天,它终于当上了梦寐以求的体育课老师.第一次课上,它发现一个有趣的事情.在上课之前,所有同学要排成一列, 假设最开始每个人有一个唯一的ID,从1到N,在排好队之后,每个同学会找出包括自己在内的前方所有同学的最小ID,…
After the data structures exam, students lined up in the cafeteria to have a drink and chat about how much they have enjoyed the exam and how good their professors are. Since it was late in the evening, the cashier has already closed the cash registe…
题意:给定一个序列,让你经过不超过9的6次方次操作,变成一个有序的,操作只有在一个连续区间,交换前一半和后一半. 析:这是一个构造题,我们可以对第 i 个位置找 i 在哪,假设 i 在pos 位置,那么如果 (pos-i)*2+i-1 <= n,那么可以操作一次换过来, 如果不行再换一种,如果他们之间元素是偶数,那么交换 i - pos,如果是奇数,交换 i - pos+1,然后再经过一次就可以换到指定位置. 代码如下: #pragma comment(linker, "/STACK:1…
Shopping 题目连接: http://codeforces.com/gym/100803/attachments Description Your friend will enjoy shopping. She will walk through a mall along a straight street, where N individual shops (numbered from 1 to N) are aligned at regular intervals. Each shop…