1045. Favorite Color Stripe (30) 时间限制 200 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Eva is trying to make her own color stripe out of a given one. She
1045. Favorite Color Stripe (30) 时间限制 200 ms 内存限制 32000 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Eva is trying to make her own color stripe out of a given one. She
题目 一个n面的骰子,求期望掷几次能使得每一面都被掷到。 link 题解 一个期望DP的常用状态设计方法: dp[i]表示当前已选了 i i i 种点数,还需一直选到 n n n 种点数的丢骰子数的期望。 显然dp[n]=0,答案为dp[0] 现在考虑转移: 则每次丢骰子有两种状态。 和之前的点数一样,有 i n \frac{i}{n} ni 的概率出现。记为 X X
Prentice Hall[1]The C Programming Language这本书诠释了何为“优雅”。其次这是毛边书,有这待遇的书不多见。最后这是一本1988年出版并流行至今的书。我会买一本的[2]Computer Systems : A Programmer's Perspective涵盖信息表示、汇编语言、处理器设计、性能优化、虚拟存储器,近两个月学了点东西,再看这本书感觉好多了,
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