twh233的算法blog

FFT教程标签（空格分隔）： 数学 ACMFFT是什么？FFT是快速傅里叶变换(fast Fourier transform)的简称。在ACM领域主要是用来快速求解多项式乘法的算法， 在信号领域也有很大用途基础知识 卷积 举个例子，给你两个向量 a(a0,a1,a2),b(b0,b1,b2)a (a_0, a_1, a_2), b(b_0, b_1, b_2) a和b的卷积就是(a0∗b0,a

a*b #include #include #include #include #include using namespace std; const double PI = acos(-1.0); //复数结构体 struct complex { double r,i; complex(double _r = 0.0,double _i = 0.0) {

传送门 You're given a sequence s of N distinct integers. Consider all the possible sums of three integers from the sequence at three different indicies. For each obtainable sum output the number of

传送门 3-idiots Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 5910    Accepted Submission(s): 2056 Problem Description King OM

传送门 Evaluation Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others) Total Submission(s): 211    Accepted Submission(s): 64 Problem Description xk=b*c

传送门 转自：点击打开链接 HDU 6036 - Division Game [ 组合数学,NTT ]  |  2017 Multi-University Training Contest 1 题意：     k堆石子围成一个圈，数量均为n，编号为0至k-1     第i轮可以操作第 (i+1) mod k 堆石子，必须拿石子且原石子数量要求整除操作后石子