def task1(array)
    indices = array.each_with_index.to_a
    sorted_indices = indices.sort_by { |(element, index)| -element }
    result = sorted_indices.map { |(element, index)| index }
    result
end
  
# Ex
array = [5, 3, 8, 1, 7]
puts "Indices in order of decreasing elements:"
puts task1(array).join(", ")