题目大意: 给你一个序列An,然后求有多少个序列Bn 满足Bi<=Ai,且这个序列的gcd不为1 题解: 考虑这样做 枚举一个因子k,然后求出有多少个序列的gcd包含这个因子k 然后把结果容斥一下,我们会发现,这个容斥恰好就是求莫比乌斯函数 所以直接先预处理出来即可 于是k从2到n依次枚举,然后把结果乘以u(k)加到最后的答案里. 另一个问题是,如何快速求出有多少个序列呢,如果单纯的把每个数除以k然后加起来,就是n^2logn 显然会超时. 所以这里先把数存起来,然后整体来做 对于k来说,每次就…

TrickGCD Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 2097    Accepted Submission(s): 816 Sample Input 1 4 4 4 4 4 Sample Output Case #1: 17   Source 2017 Multi-University Training Contest…

FFF at Valentine Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1060    Accepted Submission(s): 506 Problem Description At Valentine's eve, Shylock and Lucar were enjoying their time as any oth…

Dying Light Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 513    Accepted Submission(s): 122 Problem Description LsF is visiting a local amusement park with his friends, and a mirror room su…

CSGO Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 127    Accepted Submission(s): 20 Problem Description Senior Pan is crazy about CSGO and she is so skilled. She can kill every enemy she sp…

Ch’s gift Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1354    Accepted Submission(s): 496 Problem Description Mr. Cui is working off-campus and he misses his girl friend very much. After a w…

Big binary tree Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 597    Accepted Submission(s): 207 Problem Description You are given a complete binary tree with n nodes. The root node is numbere…

Colorful Tree Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1539    Accepted Submission(s): 616 Sample Input 3 1 2 1 1 2 2 3 6 1 2 1 3 2 1 1 2 1 3 2 4 2 5 3 6 Sample Output Case #1: 6 Case #…

Function Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 652    Accepted Submission(s): 267 Sample Input 3 2 1 0 2 0 1 3 4 2 0 1 0 2 3 1 Sample Output Case #1: 4 Case #2: 4 Source 2017 Multi-U…

Balala Power! Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 2668    Accepted Submission(s): 562 Problem Description Sample Input 1 a 2 aa bb 3 a ba abc Sample Output Case #1: 25 Case #2: 132…

KazaQ's Socks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 338    Accepted Submission(s): 212 Sample Input 3 7 3 6 4 9 Sample Output Case #1: 3 Case #2: 1 Case #3: 2 Source 2017 Multi-Unive…

Add More Zero Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 398    Accepted Submission(s): 283 Sample Input 1 64   Sample Output Case #1: 0 Case #2: 19   Source 2017 Multi-University Trainin…

地址:http://acm.split.hdu.edu.cn/showproblem.php?pid=6069 题目: Counting Divisors Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 1235    Accepted Submission(s): 433 Problem Description In mathem…

地址:http://acm.split.hdu.edu.cn/showproblem.php?pid=6071 题目: Lazy Running Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 144    Accepted Submission(s): 62 Problem Description In HDU, you have…

地址:http://acm.split.hdu.edu.cn/showproblem.php?pid=6060 题目: RXD and dividing Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 522    Accepted Submission(s): 219 Problem Description RXD has a tr…

地址:http://acm.split.hdu.edu.cn/showproblem.php?pid=6058 题目: Kanade's sum Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 505    Accepted Submission(s): 176 Problem Description Give you an array …

地址:http://acm.split.hdu.edu.cn/showproblem.php?pid=6035 题面: Colorful Tree Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1651    Accepted Submission(s): 675 Problem Description There is a tre…

学长讲座讲过的,代码也讲过了,然而,当时上课没来听,听代码的时候也一脸o((⊙﹏⊙))o 我的妈呀,语文不好是硬伤,看题意看了好久好久好久(死一死)... 数学+思维题,代码懂了,也能写出来,但是还是有一点不懂,明天继续. 感谢我的队友不嫌弃我是他的猪队友(可能他心里已经骂了无数次我是猪队友了_(:з」∠)_ ) Function Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Other…

学长好久之前讲的,本来好久好久之前就要写题解的,一直都没写,懒死_(:з」∠)_ Senior Pan Time Limit: 12000/6000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1332    Accepted Submission(s): 533 Problem Description Senior Pan fails in his discrete ma…

Problem Description There is a youngster known for amateur propositions concerning several mathematical hard problems. Nowadays, he is preparing a thought-provoking problem on a specific type of supercomputer which has ability to support calculations…

Regular polygon Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 177    Accepted Submission(s): 74 Problem Description On a two-dimensional plane, give you n integer points. Your task is to figur…

Funny Function Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1109    Accepted Submission(s): 527 Sample Input 2 2 2 3 3 Sample Output 2 33 Source 2017 Multi-University Training Contest - Team…

Maximum Sequence Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1450    Accepted Submission(s): 673 Sample Input 4 8 11 8 5 3 1 4 2 Sample Output 27 Hint For the first sample: 1. Choose 2 from…

Balala Power! Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 4124    Accepted Submission(s): 1004 Problem Description Talented Mr.Tang has n strings consisting of only lower case characters.…

[Link]:http://acm.hdu.edu.cn/showproblem.php?pid=6053 [Description] 给你一个b数组,让你求一个a数组: 要求,该数组的每一位都小于等于b数组: 且这个b数组的n个数的gcd>=2 [Solution] 设f[i]表示gcd为i的a数组有多少个; 则从gcd大的开始,往gcd小的方向枚举gcd为i; 然后a的每个位置都可以为i的倍数; 则f[i] = a[1]/i * a[2] / i * a[3]/i - a[4]/i; 但是这…

地址:http://acm.split.hdu.edu.cn/showproblem.php?pid=6070 题面: Dirt Ratio Time Limit: 18000/9000 MS (Java/Others)    Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 1599    Accepted Submission(s): 740Special Judge Problem Description In…

日常绝望系列 Questionnaire HDU - 6075 In order to get better results in official ACM/ICPC contests, the team leader comes up with a questionnaire. He asked everyone in the team whether to have more training.  Picture from Wikimedia Commons Obviously many p…

Questionnaire Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 422    Accepted Submission(s): 320Special Judge Problem Description In order to get better results in official ACM/ICPC contests,…

1006(6038) 就是对a,b分别求循环节,先统计一下b中所有长度循环节的出现次数,再对a求循环节时只要满足: a的循环节长度 % b的循环节长度=0,那么这个b的循环节就可以计入答案,尼玛只要是倍数就可以阿,比赛的时候死命想以为只有长度相同或者b的长度为1才能计算贡献,简直弱智.加了一个for就对了 /** @Date : 2017-07-25 13:22:13 * @FileName: 1006.cpp * @Platform: Windows * @Author : Lweleth (…

HDU6140 Hybrid Crystals 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=6140 题目意思:这场多校是真的坑,题目爆长,心态爆炸,题目意思就是给定一个序列.序列的每个值都有属性,N代表可加可减,L代表只能加,D代表只能减,当然这些都可以用或者不用.给定一个k,问k是否可能用这个序列构成. 思路: 源头都来自这个奇怪的式子 解释一下这个式子什么意思: 如果b[i]是N那么所有b[j](j<i)属性是N的和大于b[i]. 如果b[…