G. Give Candies There are N children in kindergarten. Miss Li bought them N candies. To make the process more interesting, Miss Li comes up with the rule: All the children line up according to their student number (1...N) and each time a child is inv…

题目链接:https://nanti.jisuanke.com/t/31716 题目大意:有n个孩子和n个糖果,现在让n个孩子排成一列,一个一个发糖果,每个孩子随机挑选x个糖果给他,x>=1,直到无糖果剩余为止.给出数字n,问有多少种分发糖果的方法. 样例输入 复制 1 4 样例输出 复制 8 解题思路:我们可以这样想,一个糖果的话,应该是只有1种方法记为x1,如果是两个糖果的话,有两种方法即为x2,分别为(1,1)和(2),从中我们可以想到如果n个糖果的话,就可以分为第n个人取1个的话就有x(…

https://nanti.jisuanke.com/t/31716 题意 n颗糖果n个人,按顺序给每个人任意数目(至少一个)糖果,问分配方案有多少. 分析 插板法或者暴力打表后发现答案就为2^(n-1),只是这个n有点大.于是马上用java.然而现实相当残酷,超时. 然后想到降幂,即(a^b)%m=a^(b%phi(m))%m,当gcd(b,m)==1.这里显然互质,于是降幂后仍然用java写,还是tle. 而后还尝试了C++大数来写,可能是使用姿势错误,也t了. 到了最后一小时,没错,我们队…

There are NNN children in kindergarten. Miss Li bought them NNN candies. To make the process more interesting, Miss Li comes up with the rule: All the children line up according to their student number (1...N)(1...N)(1...N), and each time a child is…

题意:给你n个东西,叫你把n分成任意段,这样的分法有几种(例如3:1 1 1,1 2,2 1,3 :所以3共有4种),n最多有1e5位,答案取模p = 1e9+7 思路:就是往n个东西中间插任意个板子,所以最多能插n - 1个,所以答案为2^(n - 1) % p.但是n最大有1e5位数,所以要用小费马定理化简. 小费马定理:假如p是质数,且gcd(a,p)=1,那么a (p-1)≡1(mod p) 所以我们只要把n - 1分解为n - 1 = k(p - 1) + m,而2^ k(p - 1)…

There are N children in kindergarten. Miss Li bought them NNN candies. To make the process more interesting, Miss Li comes up with the rule: All the children line up according to their student number (1...N), and each time a child is invited, Miss Li…

There are NN children in kindergarten. Miss Li bought them NN candies. To make the process more interesting, Miss Li comes up with the rule: All the children line up according to their student number (1...N)(1...N), and each time a child is invited,…

这场打得还是比较爽的,但是队友差一点就再过一题,还是难受啊. 每天都有新的难过 A. Magic Mirror Jessie has a magic mirror. Every morning she will ask the mirror: 'Mirror mirror tell me, who is the most beautiful girl in the world?' If the mirror says her name, she will praise the mirror: '…

ACM-ICPC 2018 徐州赛区网络预赛 G. Trace (思维,贪心) Trace 问答问题反馈 只看题面 35.78% 1000ms 262144K 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 ( 00 , 00 ), ( xx ,…

God Water likes to eat meat, fish and chocolate very much, but unfortunately, the doctor tells him that some sequence of eating will make them poisonous. Every hour, God Water will eat one kind of food among meat, fish and chocolate. If there are 3 c…