[HDU2294]Pendant

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[HDU2294] Pendant - 矩阵加速递推

Pendant Time Limit: 6000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1032 Accepted Submission(s): 535 Problem Description On Saint Valentine's Day, Alex imagined to present a special pendant to his girl f…

题目:Pendant 链接:http://acm.hdu.edu.cn/showproblem.php?pid=2294 分析: 1)f[i][j]表示长度为i,有j种珍珠的吊坠的数目. $f[i][j] = (k - j + 1) * f[i - 1][j - 1] + j * f[i - 1][j] $ 2)用矩阵来转移. 转移矩阵: $\left[ \begin{array}{cccccc} 1 & 0 & 0 & ... & 0 & 0 \\ 0 &…

hdu2294：Pendant

T<=10组数据问K<=30种珠子每种n<=1e9串成1~n长度的序列共有多少种,mod1234567891. 方程没想到.矩阵不会推.很好. f[i][j]--长度i,j种珠子方案数,f[i][j]=f[i-1][j]*j(放个旧的)+f[i-1][j-1]+(K-(j-1))(放个新的) n太大,推不动.由于f[i-1]->f[i],考虑矩乘优化.设递推用的矩阵为A.F[i]表示f[i][1]~f[i][k]. 方法一:f加多一个数表示ans,初始化{0,k,0,0,……},那…

Pendant

Pendant Time Limit: 6000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 104 Accepted Submission(s): 66 Problem Description On Saint Valentine's Day, Alex imagined to present a special pendant to his girl friend…

HDU - 2294： Pendant（矩阵优化DP&前缀和）

On Saint Valentine's Day, Alex imagined to present a special pendant to his girl friend made by K kind of pearls. The pendant is actually a string of pearls, and its length is defined as the number of pearls in it. As is known to all, Alex is very ri…

HDU - 2294 Pendant （DP滚动数组降维+矩阵高速功率）

Description On Saint Valentine's Day, Alex imagined to present a special pendant to his girl friend made by K kind of pearls. The pendant is actually a string of pearls, and its length is defined as the number of pearls in it. As is known to all, Ale…

2016.03.31,英语,《Vocabulary Builder》Unit 08

tend/tent: from the Latin tendere, meaning 'to stretch, extend, or spread'. tent: [tent] n. 帐篷 vt.& vi. 住帐篷,宿营 tendon: ['tendən] n. 腱 contentious: [kən'tenʃəs] adj. 好争吵的,爱争论的,有异议的 distend: [dɪ'stend] v. 扩大, 扩张, 吹大 portend: [pɔːr'tend] v. 成为...的前兆,预知,…