传送门 题意: 给你一个由六位数字组成的门票编码x,并定义F(x) = | 前三位加和 - 后三位加和|: 求出给定的门票编码 x 之前并且 F(i) < F(x) 的 i 的总个数. 题解: 为方便描述,先定义一个虚拟的数组 a[ i ][ j ] : 表示前 i 个数中,经过 F() 函数映射成数 j 的整数的总个数: 首先,我先将门票编码转化成整数,然后按升序排列. 从 0 开始便利所有的整数 num,对于某个整数 num ,判断当前的 num 是否 == 某一门票编码x,如果等于, 那么…

Lucky ticketsTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=86686#problem/J Description Everyone knows that in less than a month the Ice Hockey World Championship will start in Minsk. But few of the…

题意:给定一个n.求区间[1, n]之间的全部的a的个数.a满足: a能整除  把a表示自身二进制以后1的个数 思路:题意非常绕.... 数位dp,对于全部可能的1的个数我们都dfs一次 对于某一个可能的1的个数p来说.状态dp(len, i, j, k)里的每一位分别表示当前位,当前确定位的值模除p,已经有了多少个1.是否已经小于给定的n. 注意的是这题范围非常大,要用unsigned long long 来定义n #include<cstdio> #include<cstring&g…

Problem J. Triatrip Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100342/attachments Description The travel agency “Four Russians” is offering the new service for their clients. Unlike other agencies that only suggest one-way…

Problem J. TriatripTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100342/attachments Description The travel agency “Four Russians” is offering the new service for their clients. Unlike other agencies that only suggest one-way…

题目链接:https://codeforces.com/gym/102056/problem/L LCR is really an incredible being. Thinking so, sitting on the plane and looking at the sea, Rikka savours the fantastic journey. A fire never happened. It must be interesting to share it with her mate…

 Gym 101047M Removing coins in Kem Kadrãn Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Practice Description standard input/output Andréh and his friend Andréas are board-game aficionados. They know many of their friend…

 Gym 101047K Training with Phuket's larvae Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Practice Description standard input/output Thai cuisine is known for combining seasonings so that every dish has flavors that are…

Gym 101047E Escape from Ayutthaya Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u  Practice  Description standard input/output Ayutthaya was one of the first kingdoms in Thailand, spanning since its foundation in 1350 to…

 Gym 101047B  Renzo and the palindromic decoration Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Practice Description standard input/output At the ruins of Wat Phra Si Sanphet (วดพระศรสรรเพชญ), one can find famous inscr…