NZEC ERROR

I’m getting NZEC error in my program. Can anyone tell me what is this error and cause of this error.

maybe you are accessing an array at negative index.

Hey Pls post your solution and problem code
inly then can we help you

problem: https://www.codechef.com/LRNDSA02/problems/ZCO12002
soution: https://www.codechef.com/viewsolution/35283489
NZEC error

can you help me