Dertouzos Time Limit: 7000/3500 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1861    Accepted Submission(s): 584 Problem Description A positive proper divisor is a positive divisor of a number n, excluding n its…

Problem Description A positive proper divisor is a positive divisor of a number n, excluding n itself. For example, 1, 2, and 3 are positive proper divisors of 6, but 6 itself is not.Peter has two positive integers n and d. He would like to know the…

Dertouzos 题意: 有中文,不说. 题解: 我看了别人的题解,还有个地方没懂, 为什么是 if(d%prime[i]==0) break; ? 代码: #include <bits/stdc++.h> using namespace std; const int INF=0x3f3f3f3f; typedef long long ll; #define PU puts(""); #define PI(A) printf("%d\n",A) #de…

Dertouzos Time Limit: 7000/3500 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 577    Accepted Submission(s): 160 Problem Description A positive proper divisor is a positive divisor of a number n, excluding n itse…

感悟:这又是zimpha巨出的一场题,然后04成功fst(也就是这题) 实际上还是too young,要努力增加姿势, 分析:直接枚举这些数不好枚举,换一个角度,枚举x*d,也就是d的另一个乘数是多少 显然  x<=min(d,(n-1)/d),x还得是质数,最后发现x必须小于d的最小因子 然后预处理10w以内的素数,然后每次先得到k=min(d,(n-1)/d),然后看d最小因子是否小于k 这题的关键就在找d的最小因子,我是暴力找的(然后碰上全是大素数就t了) 实际上当d是大素数的时候,k很小…

Problem Description People in Silverland use square coins. Not only they have square shapes but also their values are square numbers. Coins with values of all square numbers up to 289 (=17^2), i.e., 1-credit coins, 4-credit coins, 9-credit coins, ...…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2069 Problem Description Suppose there are 5 types of coins: 50-cent, 25-cent, 10-cent, 5-cent, and 1-cent. We want to make changes with these coins for a given amount of money.For example, if we have 11…

Problem Description "Well, it seems the first problem is too easy. I will let you know how foolish you are later." feng5166 says."The second problem is, given an positive integer N, we define an equation like this:  N=a[1]+a[2]+a[3]+...+a[m…

2015浙江财经大学ACM有奖周赛(一) 题解报告 命题:丽丽&&黑鸡 这是命题者原话. 题目涉及的知识面比较广泛,有深度优先搜索.广度优先搜索.数学题.几何题.贪心算法.枚举.二进制等等... 有些题目还需要大家对程序的效率做出优化..大一的小宝宝可能有一些吃不消..当成是一种体验就好了. 题解目录: ZUFE OJ 2307: 最长连续不下降子串 ZUFE OJ 2308: Lucky Number ZUFE OJ 2309: 小明爱吃面 ZUFE OJ 2310: 小明爱消除 ZUF…

OwO 题目含义都是一样的,只是数据范围扩大了 对于n<=7的问题,我们直接暴力搜索就可以了 对于n<=1000的问题,我们不难联想到<主旋律>这一道题 没错,只需要把方程改一改就可以了 首先我们考虑不合法的方案强连通分量缩点后一定是DAG 考虑子问题:DAG计数 做法可以参考<cojs DAG计数1-4 题解报告> 这里给出转移方程 f(n)=sigma((-1)^(k-1)*C(n,k)*2^(k*(n-k))*f(n-k)) 如果考虑上强连通分量缩点的情况呢? 我…