# Task 2: Duplicate and Missing
# Submitted by: Mohammad S Anwar
# 
# You are given an array of integers in sequence with one missing and one duplicate.
# Write a script to find the duplicate and missing integer in the given array. Return -1 if none found.
# For the sake of this task, let us assume the array contains no more than one duplicate and missing.
# 
# Example 1:
# Input: @nums = (1,2,2,4)
# Output: (2,3)
# Duplicate is 2 and Missing is 3.
# 
# Example 2:
# Input: @nums = (1,2,3,4)
# Output: -1
# No duplicate and missing found.
# 
# Example 3:
# Input: @nums = (1,2,3,3)
# Output: (3,4)
# Duplicate is 3 and Missing is 4.

def duplicate_and_missing(list1)
    dupl_and_miss = []
    (0..list1.length-1).each do |i|
        if list1.select { |w| w === list1[i] }.length > 1
            dupl_and_miss.append list1[i]
            break
        end
    end
    (0..list1.length-1).each do |i|
        if not(list1.include? list1[0] + i)
            dupl_and_miss.append list1[0]+i
            break
        end
    end
    if dupl_and_miss.length > 1
        return sprintf '(%s)', dupl_and_miss.join(',')
    else
        return -1
    end
end

puts duplicate_and_missing([1,2,2,4])
puts duplicate_and_missing([1,2,3,4])
puts duplicate_and_missing([1,2,3,3])