WA in CHEFSHIP

general
1

Can anyone please explain me why my this submission gives WA .
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Problem : CHEFSHIP Problem - CodeChef
Thank You.

2

Your range is wrong.It should be
(l1,l1)
Check your Range Onece Again

3

For which of x y a b my range is wrong? I have used (l1,l1) for y …
Thanks