python codewars, Python 3

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#python 3.5.2

print("#" + "-" * 40 + "#")
print("Count the unique duplicates")

ss = None
def check_dup():
    if ss is None: return 0
    elems = [i for i in ss.lower() if ss.count(i) != 1]
    count = len(list(set(elems))) 
    return count

print (">>>", check_dup())

print("\n")
   
        
print("#" + "-" * 40 + "#")
print("Make a program that filters a list of strings and returns a list with only your friends name in it.")

print("If a name has exactly 4 letters in it, you can be sure that it has to be a friend of yours!")
print("Otherwise, you can be sure he's not...")

print('Ex: Input = ["Ryan", "Kieran", "Jason", "Yous"], Output = ["Ryan", "Yous"] ')

print("Note: keep the original order of the names in the output")

peoples = ["Ryan", "Kieran", "Jason", "Yous"]

def friend(x):
    return list(filter(lambda y: len(y) == 4, x))

print(">>>", friend(peoples))
        
        
print("\n")
 
        
print("#" + "-" * 40 + "#")
print("Given a set of numbers, return the additive inverse of each.") 
print("Each positive becomes negatives, and the negatives become positives.")
        
print("invert([1,2,3,4,5]) == [-1,-2,-3,-4,-5]")
print("invert([1,-2,3,-4,5]) == [-1,2,-3,4,-5]")
print("invert([]) == []")

nums = [1, -2, 3, -4, 5]

def invert(lst):
    return [-i for i in lst]

print(">>>", invert(nums))

print("\n")

def calc_ticket_change():

print("#" + "-" * 40 + "#")

print('The new "Avengers" movie has just been released!')
    print("There are a lot of people at the cinema box office standing in a huge line. ")
    print('Each of them has a single 100, 50 or 25 dollars bill. An "Avengers" ticket costs 25 dollars.')

ppls = [25, 25, 25, 25, 50, 100, 50]

def tickets(people):

ticket_price = 25
        money_in_stash = 0

for i in people:

if i == ticket_price:
                money_in_stash += ticket_price

if i > ticket_price:
                if money_in_stash - i + ticket_price < 0:
                    return "NO"
                else:
                    money_in_stash -= (i - ticket_price)

return "YES"

print(">>>", calc_ticket_change())

print("\n")

print("#" + "-" * 40 + "#")
print("Given a string, you have to return a string in which each character (case-sensitive) is repeated once")

def double_char(s):
    
    
    return "".join([i*2 for i in s])
    
    
print(double_char("alloha, World!!12"))

print("#" + "-" * 40 + "#")
print("Our task is to find the minimum sum which is obtained from summing each Two integers product.")

print(" ### FAIL WITH THIS TASK :(  SOLUTIONS IS COPYPASTED ###")

def min_sum(arr):
    sum = 0
    while len(arr) != 0:
        sum += min(arr)*max(arr)
        arr.remove(min(arr))
        arr.remove(max(arr))
    return sum
#def min_sum(arr):
#    arr.sort()
#    left, right, res = 0, len(arr) - 1, 0
#    while left < right:
#        res += arr[left] * arr[right]
#        left += 1
#        right -= 1
#    return res

print(">>>",min_sum([2, 4, 5, 3, 7, 8, 43, 32, 12, 12, 12, 45]))

#print(min_sum([2, 4, 5, 3, 7, 8]))

[ + ] Show input
Absolute running time: 0.2 sec, cpu time: 0.13 sec, memory peak: 6 Mb, absolute service time: 0,21 sec