原题链接:http://acm.hdu.edu.cn/showproblem.php?pid=2041 题目分析:题目是真的水,不难发现规律涉及斐波那契数列,就直接上代码吧. 代码如下: #include <iostream> #include <cstring> using namespace std; int t, n, num[40]; int dp(int n) { if (n == 1 || n == 2) return num[n] = n; if (num[n] !=…
The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding ones, starting from 0 and 1. That is, F(0) = 0, F(1) = 1 F(N) = F(N - 1) + F(N - 2), for N > 1. Given…
背景 众所周知,Haskell语言是一门函数式编程语言.函数式编程语言的一大特点就是数值和对象都是不可变的,而这与经常需要对状态目前的值进行修改的动态规划算法似乎有些"格格不入",本文对几乎可以说是动态规划的最简单特例:斐波那契数列的求解提出几种算法(不包括矩阵快速幂优化.Monad和通项公式计算),探讨一下函数式编程如何结合动态规划. 自底向上写法 算法1: f' 1 _ b = b f' n a b = f' (n - 1) b (a + b) f n = f' n 0 1 尾递归…
本题来自 Project Euler 第2题:https://projecteuler.net/problem=2 # Each new term in the Fibonacci sequence is generated # by adding the previous two terms. # By starting with 1 and 2, the first 10 terms will be: # 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ... # By…
1225. Flags Time limit: 1.0 secondMemory limit: 64 MB On the Day of the Flag of Russia a shop-owner decided to decorate the show-window of his shop with textile stripes of white, blue and red colors. He wants to satisfy the following conditions: Stri…