Getting wa if tried to use sys.stdin is used

[eightnoteight]

i'm getting wa for Street Trees (STREETR) if tried to use sys.stdin,
both readlines and read().split() are giving wrong answers, does any-one know why is it so??

[numerix]

Data contains about 15 input files. At least one of those has more than n values following n.
So, you get WA, if you read all values instead of just n.

[eightnoteight]

thanks a lot @numerix