Question

I require some input on the below logic.

It is kind of billing system takes the input and has a value associated with it.

A = 2 , 3A = 5
B = 3
C = 1 , 4C = 3

My code , should be such that take ABCCBAACCA , output should be value which is 16.

My solution as of now, I m thinking to count every element in the string, and them mod(modulus) by 3 for A , 4 for C (as in the above case, no need in case of B) every element in order to get the result.

I’m confused what data structure I should be using in order to implement such system.

Answer 1

In pseudocode I believe it would be:

Count all A’s, B’s and C’s

1. Divide A’s by 3 and multiply by 5

2. Modulo A’s by 3 and multiply by 2

3. Multiply B’s by 3

4. Divide C’s by 4 and multiply by 3

5. Modulo C’s by 4

Sum the 5 results.

In Ruby it could like something like this:

input = "ABCCBAACCA"
letters = ["A", "B", "C"]
total = 0

def score(letter,count)
  if letter == "A"
    ((count/3)*5)+((count%3)*2)
  elsif letter == "B"  
    count*3
  else letter == "C"  
    ((count/4)*3)+(count%4)
  end  
end 

letters.each do |letter|   
  puts "#{letter}: #{score(letter, input.count(letter))}"
  total += score(letter, input.count(letter))
end

puts "Total: #{total}"

Which produces:

A: 7
B: 6
C: 3
Total: 16