晴天的专栏

Fibonacci数列   1.定义：   0, 1, 1, 2, 3, 5, 8, 13, 21, . . .;   f0 = 0, f1= 1, fn= fn−1 + fn−2for n ≥ 2.   2.两种实现算法：   2.1递归（recursive）T(n)>2n/2证明:T(n)=T(n−1)+T(n−2)>2T(n−2)>

1. DescriptionGiven a list of n numbers in non-decreasing order A={a1,a2,⋯,an} such that a1≤a2≤⋯≤an and a number x, the objective is to determine if x is present in the list A2. Algori

1.DescriptionYou are given two arrays L1 and L2, each with n keys sorted in increasing order. For simplicity,you may assume that the keys are all distinct from each other.(a) Describe

1.DescriptionSuppose an array A consists of n elements, each of which is red, white, or blue. We seek to rearrange the elements so that all the reds come before all the whites, which come before

1.DescriptionYou have n coins (n may be even or odd) such that n−1 coins are of the same weight and one has different weight. You have a balance scale; you can put any number of coins on each

public class FrequencyCalculator { public static void main(String[] args) { //定义需要计算字母出现频率的文本 String text="some off#acebooksea3rl255 yinvestorssoldofftheirstockatthefirstchancetheygotbutceomarkz

Write a method to replace all spaces in string with '%20'. You may assume that the string has sufficient space at the end of the string to hold the additional characters, and that you are given the "t