链接[http://codeforces.com/group/1EzrFFyOc0/contest/706/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 ...
Description Vasiliy is fond of solving different tasks. Today he found one he wasn t able to solve himself, so he asks you to help. Vasiliy is givennstrings consisting of lowercase English letters. He ...
2020-02-20 21:33 0 207 推荐指数:
链接[http://codeforces.com/group/1EzrFFyOc0/contest/706/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 ...
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 ...
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 ...
CF1446D1, D2 Frequency Problem 题目来源:Codeforces, Codeforces Round #683 (Div. 1, by Meet IT),CF1446D1 Frequency Problem (Easy Version),CF ...