I used accumulate for calculating the sum of elements of the array(which got hacked) however simply calculating the sum via iteration gives the correct result.

Am i missing something or is there any problem with using this "accumulate" thing.

Accepted — (https://codeforces.me/contest/1985/submission/265437274) ,(https://codeforces.me/contest/1985/submission/265439252)

Hacked — (https://codeforces.me/contest/1985/submission/265303752)