题意: 首先定义集合的F值为  这个集合里面最大值和最小值的差. 现给出一个拥有n个数的集合(没有相同的元素), 要求求出这个集合内所有子集的F的值的和.例如: {4.7}这个集合里面有子集{4}.{7}.{4, 7}, 则这些子集的F值分别为4-4=0.7-7=0.7-4=3, 所以最后的结果就是0+0+3 = 3! 以下分析引用至 : http://blog.csdn.net/dragon60066/article/details/72599167 分析: 不难想到要先使数组升序方便计算和思…

#415 Div2 C 题意 给定一个数字集合,找到所有子集合最大值与最小值之差的和. 分析 列式子,找规律. $ (a_2 - a_1) * 2^0 + (a_3 - a_1) * 2^1 + ... + (a_n - a_1) * 2^{n-2}$ + \((a_3 - a_2) * 2^0 + (a_4 - a_2) * 2^1 + ...+ (a_n - a_2) * 2^{n-3}\) + ... + \((a_{n-1} - a_{n-2}) * 2^0 + (a_n - a_{n-…

A Simple Math Problem Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4331    Accepted Submission(s): 2603 Problem Description Lele now is thinking about a simple function f(x).If x < 10 f(x) =…

A Simple Math Problem Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 155 Accepted Submission(s): 110   Problem Description Lele now is thinking about a simple function f(x). If x < 10 f(x) = x.If…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3483 A Very Simple Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 945    Accepted Submission(s): 471 Problem Description This is a very si…

题目 A Simple Math Problem 解析 矩阵快速幂模板题 构造矩阵 \[\begin{bmatrix}a_0&a_1&a_2&a_3&a_4&a_5&a_6&a_7&a_8&a_9\\ 1&0&0&0&0&0&0&0&0&0\\ 0&1&0&0&0&0&0&0&0&0\\ 0&…

题目链接:传送门 题目: Recursive sequence Time Limit: / MS (Java/Others) Memory Limit: / K (Java/Others) Total Submission(s): Accepted Submission(s): Problem Description Farmer John likes to play mathematics games with his N cows. Recently, they are attracted…

GTY's math problem Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 0    Accepted Submission(s): 0 Problem Description GTY is a GodBull who will get an Au in NOI . To have more time to learn alg…

CF954F Runner's Problem(动态规划,矩阵快速幂) 题面 CodeForces 翻译: 有一个\(3\times M\)的田野 一开始你在\((1,2)\)位置 如果你在\((i,j)\)位置 在不出界的前提下,可以走到\((i+1,j),(i+1,j±1)\) 有\(n\)段障碍,障碍不能走 询问从\((1,2)\)到达\((M,2)\)的方案数 \(n<=10^4,M<=10^{18}\) 题解 发现\(M\)的范围非常大 很容易往矩阵快速幂的方向考虑 如果知道上一行的…

A Simple But Difficult Problem Time Limit: 5000ms Memory Limit: 65536KB 64-bit integer IO format: %lld      Java class name: Main Prev Submit Status Statistics Discuss Next Type: None   None   Graph Theory       2-SAT       Articulation/Bridge/Biconn…