题解报告:hdu 2709 Sumsets】的更多相关文章

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2709 Problem Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cows use only numbers that are an integer power of 2. Here are the possible…
Sumsets http://acm.hdu.edu.cn/showproblem.php?pid=2709 Problem Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cows use only numbers that are an integer power of 2. Here are the possi…
题目链接 http://acm.hdu.edu.cn/showproblem.php?pid=2709 题意 给出一个数N 要求有多少种方式 求和 能够等于N 加的数 必须是 2的幂次 思路 首先可以想到的是 如果 N 是奇数的话 那么 到达N 的方法数 就是 到达 N - 1 的方法数 因为就相当于 把 所有到达N-1 的方法数 都再 + 1 如果 N 是偶数的话 就有两种情况 0.分解的数字中至少有两个1 那么 dp[n] = 1 + 1 + dp[n - 2] 1.分解的数字中没有1 也就…
Sumsets Time Limit: 6000/2000 MS (Java/Others)     Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2159     Accepted Submission(s): 875 Problem Description Farmer John commanded his cows to search for different sets of numbers that sum…
Sumsets Time Limit: 6000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3968    Accepted Submission(s): 1578 Problem Description Farmer John commanded his cows to search for different sets of numbers that sum t…
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…