In SnackDown 2017 Online Elimination Round yesterday, I cannot get AC from problem Waiting in a Queue during contest.

After many hours of contest, I found a bug of my code:

The correct input format of this problem is:

n

a₁ a₂ ... a_n

b₁ b₂ ... b_n

But I read Input as following:

n

a₁ b₁

a₂ b₂

.
.
.

a_n b_n

I felt shocked after finding this bug. Why can I pass sample with this bug !!??

Then I saw the sample carefully. It shows:

2
3 2
2 2

I don't know how to use English to describe my though....

And I thought, if I get AC by just fixing this bug, I must post this bug on Codeforces!

Now it's the time.