Problem Solving

Problem 4 : Staircase

       #
      ##
     ###
    ####

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 .


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

Problem 6 - Birthday Cake Candles

You are in charge of the cake for your niece’s birthday and have decided the cake will have one candle for each year of her total age. When she blows out the candles, she’ll only be able to blow out the tallest ones. Your task is to find out how many candles she can successfully blow out.


def birthdayCakeCandles(ar):

    dict_ = {}
    for i in ar:
        if i not in dict_:
            dict_[i]=1
        else:
            dict_[i]+=1
    return max(dict_.values())

Problem 9 : Apple and Orange

alt text

def countApplesAndOranges(s, t, a, b, apples, oranges):

    app = 0
    org = 0

    app_list = []
    org_list = []

    for i in apples:
        app_list.append(a+i)
    for j in oranges:
        org_list.append(b+j)

    for k in app_list:
        if k>=s and k<=t:
            app+=1
    for m in org_list:
        if m>=s and m<=t:
            org+=1

    print(app)
    print(org)

Problem 10 : Kangaroo

alt text

def kangaroo(x1, v1, x2, v2):

    if v1 == v2 and x1 == x2:
        return 'YES'
    elif v1 == v2:
        return 'NO'
     
    x = (x2-x1) / (v1-v2)    
    if (x == round(x) and x > 0):
        return 'YES'
    else:
        return 'NO'