Staircase

staircase.rb

# Challenge: Staircase - HakerRank
# Author: Stella Miranda

# Consider a staircase of size n = 4:

   #
  ##
 ###
####

# Observe that its base and height are both equal to n, and the image is drawn using # symbols and spaces. 
# The last line is not preceded by any spaces.
# Write a program that prints a staircase of size n.

# Input Format
# A single integer, n, denoting the size of the staircase.

# Output Format
# Print a staircase of size n using # symbols and spaces.

# Note: The last line must have 0 spaces in it.

# Sample Input
# 6 

# Sample Output

     #
    ##
   ###
  ####
 #####
######

n = gets.strip.to_i
n.times do |i|
    puts" "*(n-i-1)+"#"*(i+1)
end