Print the absolute difference between the two sums of the matrix's diagonals as a single integer in ruby.

# Given a square matrix of size N×N, calculate the absolute difference between the sums of its diagonals.

# Input Format

# The first line contains a single integer, N. The next N lines denote the matrix's rows, with each line containing N space-separated integers describing the columns.

# Output Format

# Print the absolute difference between the two sums of the matrix's diagonals as a single integer.


p "Enter the size of array :"
n = gets.strip.to_i
a = Array.new(n){Array.new(n)}
for a_i in (0..n-1)
    p "Enter #{a_i+1} row elements with one space :"
    a_t = gets.strip
    a[a_i] = a_t.split(' ').map(&:to_i)
end

first_diagonal = 0
second_diagonal = 0
for i in (0..n-1)
    j=i
    first_diagonal += a[i][j]
    second_diagonal += a[i][n-1]
    n -= 1
end
difference = (first_diagonal - second_diagonal).abs
p "Difference is :", difference