you give array n positive integersyou use follow operation time like select integer 1 le k le n thing decrement k element array decrement k element array for example n5 a32214 apply follow operation possible option list decrement element array after operation a2 1 2 1 4 decrement element array after operation a3 2 1 0 3 decrement element array after operation a2 1 1 0 3 determine possible element array equal zero apply certain number operation