Why is second iterator over array 'arr' not working in Hackerrank compiler?

Question

I'm trying to run simple code for finding second highest number in array 'arr' but second array iterator over 'arr' is not working.

if __name__ == '__main__':
    n = int(input())
    arr = map(int, input().split())

    a1=-101
    a2=-102
    for i in arr:
        if a1<i :a1=i

    for j in arr: 
        print(j)

I expect arr value to be printed but getting ~ no response on stdout ~

Iterator like map can only be iterated once. – Mark Jul 27 '19 at 03:10 — Mark, Jul 27 '19 at 03:10

score 0 · Answer 1 · answered Jul 27 '19 at 03:09

0

If you are on Python 3, map is an iterator (it doesn't give a list). To be able to iterate over it more than once, wrap it in a call to list():

arr = list(map(int, input().split()))

answered Jul 27 '19 at 03:09

iz_

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Better: `[int(i) for i in input().split()]` and please dont call it `arr` since it is not an array. – Klaus D. Jul 27 '19 at 03:44
@KlausD. It is a matter of style, not objective good/bad. – iz_ Jul 27 '19 at 15:52

score 0 · Answer 2 · answered Jul 27 '19 at 03:18

0

arr = map(int, input().split()) producinng a generator and iterating over a generator, without make it iterable first, that is why you are getting error.

arr = list(map(int, input().split()))

answered Jul 27 '19 at 03:18

sahasrara62

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There is no error here. The point is second iteration does not work because the iterator is exhausted. – Austin Jul 27 '19 at 03:27
i think we need to C where to give python Rat to exit from exhausted state. – sahasrara62 Jul 27 '19 at 03:31

Why is second iterator over array 'arr' not working in Hackerrank compiler?

2 Answers2