此题解是教练给我的作业,AK了本场比赛的人,以及认为题目简单的人可以不必看 T1 算法一 暴力枚举对信号站顺序的不同排列,然后对代价取\(\min\)即可. 时间复杂度\(O(m! \cdot n)\),可以获得\(30\)分. 算法二 首先我们的想法是状压dp,而状压dp所记录的状态是某个位置前面所选择的信号站集合以及当前加入的信号站编号,我们需要把答案的每一项的贡献分配到dp的不同阶段! 我们设最终的排列里面编号为\(i\)的信号站在第\(p_i\)个位置. 对于\(1 \leq i < n…

最前面: AT的题都很有思维难度,总结一下一些AT的常规操作 1.对于有操作的题目,如果正面推不行的话考虑倒推,将操作转化,寻找更好的性质 2.模型转化,看到某一种的计算的式子,需要考虑有没有更简化的模型可以达到相同的效果 3.补集转化,正难则反 4.分析题目性质,计数题要找到一些限制条件或者构造方案使得计数不重不漏 目标:稳定三题 比例:D:0/1  C:3/6 B:2/3 10.12 - 10.22 AGC47:Solved A,B,C,D Aim E AGC46:Solved A,B,C,…

Dance Dance Revolution Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Practice UVA 1291 Mr. White, a fat man, now is crazy about a game named ``Dance, Dance, Revolution". But his dance skill is so poor that h…

Dance Dance Revolution Time limit: 3.000 seconds Mr. White, a fat man, now is crazy about a game named ``Dance, Dance, Revolution". But his dance skill isso poor that he could not dance a dance, even if he dances arduously every time. Does ``DDR"…

1305: [CQOI2009]dance跳舞 Description 一次舞会有n个男孩和n个女孩.每首曲子开始时,所有男孩和女孩恰好配成n对跳交谊舞.每个男孩都不会和同一个女孩跳两首(或更多)舞曲.有一些男孩女孩相互喜欢,而其他相互不喜欢(不会“单向喜欢”).每个男孩最多只愿意和k个不喜欢的女孩跳舞,而每个女孩也最多只愿意和k个不喜欢的男孩跳舞.给出每对男孩女孩是否相互喜欢的信息,舞会最多能有几首舞曲? Input 第一行包含两个整数n和k.以下n行每行包含n个字符,其中第i行第j个字符为'…

1.题目描述: 1175. Strange Sequence Time limit: 1.0 secondMemory limit: 2 MB You have been asked to discover some important properties of one strange sequences set. Each sequence of the parameterized set is given by a recurrent formula: Xn+1 = F(Xn-1, Xn)…

C. Efim and Strange Grade time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Efim just received his grade for the last test. He studies in a special school and his grade can be equal to any po…

题目链接: 传送门 A strange lift Time Limit: 1000MS     Memory Limit: 32768 K Description There is a strange lift.The lift can stop can at every floor as you want, and there is a number Ki(0 <= Ki <= N) on every floor.The lift have just two buttons: up and…

Strange fuction Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 5933 Accepted Submission(s): 4194 Problem Description Now, here is a fuction: F(x) = 6 * x^7+8*x^6+7*x^3+5*x^2-y*x (0 <= x <=100) C…

Description Elina is reading a book written by Rujia Liu, which introduces a strange way to express non-negative integers. The way is described as following: Choose k different positive integers a1, a2, …, ak. For some non-negative m, divide it by ev…