#1239 : Fibonacci 时间限制:10000ms 单点时限:1000ms 内存限制:256MB 描述 Given a sequence {an}, how many non-empty sub-sequence of it is a prefix of fibonacci sequence. A sub-sequence is a sequence that can be derived from another sequence by deleting some elements…
http://hihocoder.com/problemset/problem/1873 时间限制:1000ms 单点时限:1000ms 内存限制:512MB 描述 A small frog wants to get to the other side of a river. The frog is initially located at one bank of the river (position 0) and wants to get to the other bank (positio…
Difficulty: Easy Topic: Fibonacci seqs Write a function which returns the first X fibonacci numbers. ;; 首先实现一个求fibonacci数的函数 ;;最简单的实现,就是通过定义来实现递归函数,(如下的fibonacci-number),但是这样缺点很明显,首先这不算尾递归,代码里面有大量的重复计算.其次,jvm不支持尾调用优化,因此,即使是尾递归,当嵌套层侧过深时,也会出现stackoverf…
经典的Fibonacci数的问题 主要想展示一下迭代与递归,以及尾递归的三种写法,以及他们各自的时间性能. public class Fibonacci { /*迭代*/ public static int process_loop(int n) { if (n == 0 || n == 1) { return 1; } int a = 1, b = 1; int i = 1; while (i < n) { i++; int t = b; b = a + t; a = t; } return…
Hihocoder 太阁最新面经算法竞赛18 source: https://hihocoder.com/contest/hihointerview27/problems 题目1 : Big Plus 描述 Given an NxN 01 matrix, find the biggest plus (+) consisting of 1s in the matrix. size 1 plus size 2 plus size 3 plus size 4 plus 1 1 1 1 111 1 1…
hihoCoder太阁最新面经算法竞赛15 Link: http://hihocoder.com/contest/hihointerview24 题目1 : Boarding Passes 时间限制:10000ms 单点时限:1000ms 内存限制:256MB 描述 Long long ago you took a crazy trip around the world. You can not remember which cities did you start and finish t…