Problem:
MathJax.Hub.Config({ tex2jax: { inlineMath: [["$","$"], ["\\(","\\)"]], processEscapes: true }});

Areas on the Cross-Section Diagram

Your task is to simulate a flood damage.

For a given cross-section diagram, reports areas of flooded sections.

Assume that rain is falling endlessly in the region and the water overflowing from the region is falling in the sea at the both sides.
For example, for the above cross-section diagram, the rain will create floods which have areas of 4, 2, 1, 19 and 9 respectively.

Input

A string, which represents slopes and flatlands by '/', '\' and '_' respectively, is given in a line. For example, the region of the above example is given by a string "\\///\_/\/\\\\/_/\\///__\\\_\\/_\/_/\".

output

Report the areas of floods in the following format:

$A$

$k$ $L_1$ $L_2$ ... $L_k$

In the first line, print the total area $A$ of created floods.

In the second line, print the number of floods $k$ and areas $L_i (i = 1, 2, ..., k)$ for each flood from the left side of the cross-section diagram. Print a space character before $L_i$.

Constraints

$1 \leq$ length of the string $\leq 20,000$

Sample Input 1

\\//

Sample Output 1

4
1 4

Sample Input 2

\\///\_/\/\\\\/_/\\///__\\\_\\/_\/_/\

Sample Output 2

35
5 4 2 1 19 9

Solution in Ruby (judge verdict: Accepted)

diagram = gets.chomp.chars

search = ->{
  max = min = height = 0
  diagram.each_with_index do |x, i|
    case x
    when "\\"
      height -= 1
      min = height if height < min
    when "/"
      height += 1
      max = height if height > max
    end
  end
  [max - min, max]
}

n, level = search.()
table = Array.new(n) {[]}

diagram.each_with_index do |x, i|
  case x
  when "\\"
    table[level] << i
    level += 1
  when "/"
    level -= 1
    a = table[level].last
    table[level] << i if a
  end
  table
end
table.map! do |one_level|
  ar = []
  one_level.each_slice(2) {|x| ar << x}
  ar.select {|x| x.size == 2}
end

calc_area = ->(pair, level) {
  area = pair[1] - pair[0]
  return area if level == n
  table1 = table[level]
  table[level].each do |downer_pair|
    if pair[0] < downer_pair[0] and downer_pair[1] < pair[1]
      table1 -= [downer_pair]
      area += calc_area.(downer_pair, level + 1)
    end
  end
  table[level] = table1
  area
}

pools = []
solve = ->{
  min = [[Float::INFINITY, 0], 0]
  table.each_with_index do |one_level, i|
    next if one_level.empty?
    pair = one_level[0]
    min = [pair, i] if pair[0] < min[0][0]
  end
  table[min[1]] -= [min[0]]
  pools << calc_area.(min[0], min[1] + 1) if min[0][0] != Float::INFINITY
  solve.() unless table.flatten.empty?
}

solve.() unless table.empty?

if pools.empty?
  puts 0, 0
else
  puts pools.inject(&:+)
  puts pools.size.to_s + " " + pools.join(" ")
end