九月旧约 - 博客园

求大的组合数模板利用Lucas定理

摘要： Lucas定理：A、B是非负整数，p是质数。A B写成p进制：A=a[n]a[n-1]…a[0]，B=b[n]b[n-1]…b[0]。则组合数C(A,B)与C(a[n],b[n])C(a[n-1],b[n-1])…*C(a[0],b[0]) mod p同余即：Lucas(n,m,p)=C(n%p 阅读全文

posted @ 2018-10-03 16:30 九月旧约阅读(215) 评论(0) 推荐(0)

2018CCPC 吉林现场赛赛后总结

摘要：一直以来都没有比赛完写总结的习惯，导致前面几次比赛都没有写过总结。这是我写的第一场总结把，有时间有想法还记得细节的话再把前面几次比赛的总结给补上把。热身赛：热身赛的时候，写的比较急想着快点做出题，队友B看懂了A题发现是一个水题当时过的人也挺多的，就想着赶紧写完交，写完后过了样例就提交了，然后就阅读全文

posted @ 2018-09-29 20:52 九月旧约阅读(1077) 评论(0) 推荐(0)

CF915C Permute Digits 字符串贪心

摘要： You are given two positive integer numbers a and b. Permute (change order) of the digits of a to construct maximal number not exceeding b. No number i 阅读全文

posted @ 2018-09-28 20:48 九月旧约阅读(320) 评论(0) 推荐(0)

CF1036C Classy Numbers dfs+二分

摘要： Classy Numbers time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Let's call some positive 阅读全文

posted @ 2018-09-11 16:58 九月旧约阅读(199) 评论(0) 推荐(0)

Ryuji doesn't want to study 2018徐州icpc网络赛树状数组

摘要： Ryuji is not a good student, and he doesn't want to study. But there are n books he should learn, each book has its knowledge a[i]a[i]. Unfortunately, 阅读全文

posted @ 2018-09-10 18:48 九月旧约阅读(163) 评论(0) 推荐(0)

Supreme Number 2018沈阳icpc网络赛找规律

摘要： A prime number (or a prime) is a natural number greater than 11 that cannot be formed by multiplying two smaller natural numbers. Now lets define a nu 阅读全文

posted @ 2018-09-09 20:19 九月旧约阅读(388) 评论(0) 推荐(0)

Trace 2018徐州icpc网络赛思维+二分

摘要： There's a beach in the first quadrant. And from time to time, there are sea waves. A wave ( xx , yy) means the wave is a rectangle whose vertexes are 阅读全文

posted @ 2018-09-09 20:12 九月旧约阅读(690) 评论(2) 推荐(2)

Features Track 2018徐州icpc网络赛思维

摘要： Morgana is learning computer vision, and he likes cats, too. One day he wants to find the cat movement from a cat video. To do this, he extracts cat f 阅读全文

posted @ 2018-09-09 19:59 九月旧约阅读(295) 评论(0) 推荐(0)

牛客多校第六场 C Generation I 组合数学阶乘逆元模板

摘要：链接：https://www.nowcoder.com/acm/contest/144/C来源：牛客网 Oak is given N empty and non-repeatable sets which are numbered from 1 to N. Now Oak is going to d 阅读全文

posted @ 2018-08-30 15:02 九月旧约阅读(274) 评论(0) 推荐(0)

关于斐波那契数列的一些恒等式模板牛客OI测试赛 A 斐波拉契

摘要：牛客A 斐波拉契链接：https://www.nowcoder.com/acm/contest/181/A来源：牛客网设f[i]表示斐波那契数论的第i项 f[1]=1,f[2] =1,f[i] = f[i - 1] + f[i - 2] 给定一个n 求输入描述: 输出描述: 示例1 输入复制阅读全文

posted @ 2018-08-30 11:26 九月旧约阅读(538) 评论(0) 推荐(0)