Question

我正在为一个名为的学习网站编写一个函数 code wars我的主要问题是，当我遍历给定的数字时，我无法分配所需的5个整数。我从ruby-doc了解到我可以分配一个像

这样的数组

arr = [1, 2, 3, 4, 5, 6]
arr[1..4] #=> [2, 3, 4, 5]

我适应了这样的循环

digits = 33333339999990000000
ray_a, ray_b = []   
ray_a = digits[start_count, end_count]  
ray_b = digits[start_count + 1, end_count+1]

但出于某种原因，因为它被循环，它为数组分配了太多的数字

问题的实际指示以及我的尝试如下......

在以下6位数字：283910

91是最大的2位数序列。

完成解决方案，使其返回给定数字中找到的最大五位数字。该数字将作为一个只有数字的字符串传入。它应该返回一个五位整数。传递的数字可能大到1000位。

我的带注释的代码......为了我的测试目的，我通过了33333339999990000000

def solution(digits)
  ray_a = []   # ray_a & ray_b are to be compaired
  ray_b = []

  total_counter = 1 
  start_count = 0
  end_count = 4
  answer = 0

  digits = digits.to_s.split('')  #turns digits into an array of integers
  digits.map!{|x| x.to_i }


  while total_counter<=digits.length do  #carries out as many loops as the variable "digits" has digits

      ray_a = digits[start_count, end_count]  #sets ray_a & ray_b to the numbers to be compaired
      ray_b = digits[start_count + 1, end_count+1]   

    # the above block is where my problem is. At any time each array should have a maximum of 5 digits,
    # instead using the example variable I am passing in as many as 13 digits are assigned 

    # I found the fatal flaw in my code with the debugging block
    # puts "ray_a"
    # print ray_a


    ray_a.map{|x| x.to_s}  #this block turns ray_a & ray_b into indivudal integers that are not arrays. 
    ray_a = ray_a.join('')
    ray_b.map{|x| x.to_s}
    ray_b = ray_b.join('')
    ray_a = ray_a.to_i
    ray_b = ray_b.to_i



    if ray_a > ray_b # this block determines the answer 
          if ray_a > answer
            answer = ray_a 
    end 
      end 



    start_count +=1 #incriments all the counters
    end_count +=1
    total_counter+=1
    ray_a = []# resets both arrays to be redefined in the next loop
    ray_b = []
end 
return answer

 end


 solution(33333339999990000000)

Answer 1

ray_a = digits[start_count, end_count]
ray_b = digits[start_count + 1, end_count+1]

您设置ray_a和ray_b的方式不正确。你在做什么

ray_a = digits[starting index, length]

这就是为什么你的数组长度不断变化，因为你正在递增end_count。

您需要做的是

ray_a = digits[start_count..end_count]

或

ray_a = digits[start_count, 5]

您可以删除变量。

我无法将所需的变量分配给我的数组。

1 个答案: