My first AC submission
on test
s = 5 n = 2
 1 3 0 3 0
answers YES,
but correct is NO

(sorry for bad english)

"No" is true.

because: a[1]=1 a[2]=3 a[3]=0 a[4]=3 a[5]=0;

sum=a[1]+a[2]+a[3]=6 > (4-2+1)+2=5 ,=> "No"