is groupMapReduce() a new thing ?

Love this implementation!

That is it!
I did not consider that case.
Thank you!

Just a suggestion for those of you having trouble... A $50 bill does not equal two $25 bills. You have to think of each bill as a whole unit because you have an empty cash register, and can't make change until you're given it.

I think that your problem probably stems from the fact that you can also give change for a $100 bill in the form of one $50 bill and one $25 bill (instead of three $25 bills).

Hi everyone! I have troubles when I run this code, I pass all tests but when passing the number six
I get an error and I do not understand why as I think my code should work well. help me please,
I am very desperate. what i do is to count the number of bills of 25 i get and the change from 50
should be 1 bill and from 100 should be 3 bills. So I sum the number of 50s and three times 100s I get and then
see which one is bigger to return the result of the function

def tickets(people):
num_25 = 0
num_50 = 0
num_100 = 0
for i in range(len(people)):
if people[i] == 25:
num_25 = num_25 + 1
elif people[i] == 50:
num_50 = num_50 + 1
else:
num_100 = num_100 + 1
nec_25 = num_50 + 3 * num_100
if nec_25 < num_25 or nec_25 == num_25:
return 'YES'
else:
return 'NO'