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# Why i run this code in "Land ho!" Code coach chellenge and it's wrong in case 3???(help me plz)

def timetowait(x): if x < 20: return 10 else: return 20 + timetowait(x-20) people=int(input()) print(timetowait(people)) #the mission is to calculate the time you come to the other side of the sea . taking people are in front of you as input , Each ride lasts 20 minutes, Including going back and forth, and each ride can carry 20 people #For example: Your input: 20 Output: 30 #because you are the 21st person and the first ride carry 20 people (not you) , so you will wait 20 for back and forth,then it takes you 10 minutes to go to other side

2 Respuestas

+ 3

TCorn your solution is correct, but throw error (maximum recursion call) for big input: recursive function cannot be called successively more than 999 times (at least on sololearn python execution):
https://code.sololearn.com/cGCKS7CT6wLk/?ref=app
that means 998 times from itself...
so, for input greater than (999*20 == 19 980), you will have error (no output) ^^
simple use of floor (whole) division (//) let you handle arbitrary big numbers:
people = int(input())
print(10+(people//20))
(parenthesis inside expression -- around floor division -- are optional due to operator precedence)

+ 2

I think the recursion is causing the problem. Why not just use a simple math expression? After 'else' you just want to return 10 plus 20 times the number of times 20 goes into x.