n = gets.to_i
k = gets.to_i
a = [*0...n]
k.times{
    x, y = gets.split.map(&:to_i)
    x -= 1
    y -= 1
    tmp = a[x]
    a[x] = a[y]
    a[y] = tmp
    }
b = gets.split.map(&:to_i)
ans = []
n.times{|i|
    1.upto(n - i - 1){|j|
        if b[a[j]] < b[a[j - 1]]
            tmp = a[j]
            a[j] = a[j - 1]
            a[j - 1] = tmp
            ans.push(j)
        end
        }
    }
s = ans.size
p s
s.times{|i|
    puts "#{ans[i]} #{ans[i] + 1}"
    }