I dont understand this run error

#1

I have written a lot of codes where my code is working fine on sample cases but when I submit, I get a run error.

#2

it seems there are multiple whitespaces between 2 integers in input, use try and except to solve this problem
Corrected Code:
N=int(input())

for i in range(N):

    length=int(input())

    x=input()

    alist=x.split(" ")

    csum=0

    maxsum=-1000000

    for i in alist:

        try:

            csum+=int(i)

            if csum>maxsum:

                maxsum=csum

            if csum<0:

                csum=0

        except:

            pass

    print (maxsum)
#3

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