CODEWITHSUNDEEP
python
dericcain
dericcain

Reputation: 2290

HackerRank Staircase Python

I am trying to solve a problem in HackerRank and I am having an issue with my submission. My code works in PyCharm but HackerRank is not accepting my submission.

Here is the problem I am trying to solve: https://www.hackerrank.com/challenges/staircase

Here is my code:

def staircase(num_stairs):
    n = num_stairs - 1
    for stairs in range(num_stairs):
        print ' ' * n, '#' * stairs
        n -= 1
    print '#' * num_stairs
staircase(12)

Any ideas why HackerRank is not accpeting my answer?

Upvotes: 5

Views: 66517

Answers (17)

Mahaveer Jangir
Mahaveer Jangir

Reputation: 605

def staircase(n):
    for i in range(1, n+1):
        a = [' ']*(n-i)+['#']*i
        print("".join(a))

Upvotes: 0

Abhinav
Abhinav

Reputation: 99

This might not be the cleanest way to write the code, but it works:

print('\n'.join(' ' * (n - i) + '#' * i for i in range(1, n + 1)))

Upvotes: 0

Kenneth Leung
Kenneth Leung

Reputation: 370

You can just change the sep argument of print from ' ' to '', and your answer will be correct

def staircase(n):    
    for i in range(1, n+1):
        print(' ' * (n-i), '#' * (i), sep='')

The answer you submitted is not accepted because the default print settings adds an empty space in front of the printouts, and one of the question requirements is for there to have no spaces in the output.

The default sep in print is a space character i.e. ' '.

Upvotes: 0

aakash4dev
aakash4dev

Reputation: 1176

one more solution:

def staircase(n):
    for i in reversed(range(n)):
        print(i*' '+(n-i)*'#')

Upvotes: 0

AABULUT
AABULUT

Reputation: 60

def staircase(n):
    space = n-1
    for i in range(n):
        x = i + 1
        print(" " * space + "#" * x)
        space -= 1

Upvotes: 0

Avid Coder
Avid Coder

Reputation: 18387

Understanding the problem is 80% of the solution. The requirement states the min/max total of stairs.

"""
Prints a staircase with a total number of stairs
Note: total number of stairs must be between 1 and 100 inclusive, as per requirements
"""
def staircase(n):
    if n < 1 or n > 100:
        print("Error: Total number of stairs must be between 1, 100 inclusive!")
    else:
        for x in range(1, n+1):
            print(" " * (n - x) + "#" * x )

#-----------------------
staircase(0)
Error: Total number of stairs must be between 1, 100 inclusive!

staircase(101)
Error: Total number of stairs must be between 1, 100 inclusive!

staircase(4)
   #
  ##
 ###
####

Upvotes: 0

Ali H. Kudeir
Ali H. Kudeir

Reputation: 1054

I was getting an error until I replaced the comma with a plus sign:

print(' ' * (n - i - 1) + '#' * (i + 1))

Upvotes: 0

jugesh
jugesh

Reputation: 82

its look like secondary diagonal

 def staircase(n):
        for i in range(n):
            for j in range (n):
                if i+j == n-1:
                    print(" "*j+"#"*(n-j))

output-

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

Upvotes: 1

Martijn Pieters
Martijn Pieters

Reputation: 1122382

Your output is incorrect; you print an empty line before the stairs that should not be there. Your range() loop starts at 0, so you print n spaces and zero # characters on the first line.

Start your range() at 1, and n should start at num_stairs - 2 (as Multiple arguments to print() adds a space:

from __future__ import print_function

def staircase(num_stairs):
    n = num_stairs - 2
    for stairs in range(1, num_stairs):
        print(' ' * n, '#' * stairs)
        n -= 1
    print('#' * num_stairs)

You can simplify this to one loop:

def staircase(num_stairs):
    for stairs in range(1, num_stairs + 1):
        print(' ' * (num_stairs - stairs) + '#' * stairs)

Note that I use concatenation now to combine spaces and # characters, so that in the last iteration of the loop zero spaces are printed and num_stairs # characters.

Last but not least, you could use the str.rjust() method (short for “right-justify”) to supply the spaces:

def staircase(num_stairs):
    for stairs in range(1, num_stairs + 1):
        print(('#' * stairs).rjust(num_stairs))

Upvotes: 17

Santosh Tirunagari
Santosh Tirunagari

Reputation: 291

def staircase(n):
    for i in range(0, n): # n rows 
        print(' '*(n-i-1) + '#'*(i+1)) # first print n-i-1 spaces followed by i '#'


n = int(input())
staircase(n)

Upvotes: 1

Mahesh Bhattarai
Mahesh Bhattarai

Reputation: 752

for i in range(n):
    result = ' '*(n-i-1) +('#')*(i+1)
    print(result)

Upvotes: 0

Amir Abdollahi
Amir Abdollahi

Reputation: 455

first, create a list, then print with join \n'

def staircase(n):
    print("\n".join([' ' * (n-x) + '#' * x for x in range(1, n+1)]))

Upvotes: 2

Kamil Sindi
Kamil Sindi

Reputation: 22832

You can use rjust to justify the string to the right:

def staircase(n):
    for i in range(1, n+1):
         print(("#" * i).rjust(n))

Upvotes: 5

Siva Reddy Panga
Siva Reddy Panga

Reputation: 1

 def staircase(n):
     for in range(i,n+1):
          print str("#"*i).rjust(n)

Upvotes: -2

Sayak Sen
Sayak Sen

Reputation: 11

you can simply use while loop also.

import sys
n1=int(raw_input())-1
n2=1

while n1>=0:
    print " "*n1,"#"*n2
    n1=n1-1
    n2=n2+1

Upvotes: -1

IzakMarshall
IzakMarshall

Reputation: 27

Another Answer

    H = int(input())
    for i in range(1,H+1):
       H = H - 1
       print(' '*(H) + ('#'*(i)))

Upvotes: -1

Pankaj Kumar
Pankaj Kumar

Reputation: 189

Another solution

n = int(raw_input())
s = '#'
for i in xrange( 1 , n+1):
    print " "*(n-i) + s*i

Upvotes: 2

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