Description Vasiliy is fond of solving different tasks. Today he found one he wasn't able to sol ...
链接 http: codeforces.com group EzrFFyOc contest problem C 题意: 他希望它们按词典顺序排序 就像字典中那样 ,但他不允许交换其中的任何一个。 唯一允许他做的操作是将其中的任何一个反转 第一个字符变成最后一个, 第二个字符变成最后一个,以此类推 。 思路 DP,不断更新花费的值,并且判断是否可以满足字典序排序。 dp i 表示,表示排到第i 个 ...
2018-08-08 14:13 0 915 推荐指数:
Description Vasiliy is fond of solving different tasks. Today he found one he wasn't able to sol ...
CF1153F Serval and Bonus Problem 官方的解法是\(O(n ^ 2)\)的,这里给出一个\(O(n \log n)\)的做法。 首先对于长度为\(l\)的线段,显然它的答案就是长度为\(1\)的线段的答案\(\times l\),这样做只是为了方便计算。 考虑 ...
The library you create when you are done with Learn C The Hard Way http://c.learncodethehardway.org/ https://github.com/zedshaw/liblcthw ...
题意 一个长为 \(l\) 的线段,每次等概率选择线段上两个点,共选出 \(n\) 条线段,求至少被 \(k\) 条线段覆盖的长度期望。 数据范围 \(1 \le k \le n \le 200 ...
Vasya is preparing a contest, and now he has written a statement for an easy problem. The statement is a string of length n">n consisting ...
C. Bank Hacking time limit per test 2 seconds ...
C. Watto and Mechanism time limit per test 3 seconds memory limit per test 256 megabytes input ...