special index-> if after deleting element from index i , sum of even index=sum of odd index approach->
after deleting ,previous element at odd index will be now at even index and vice versa s_odd= odd[0 to i]+ even[i+1 to len]
s_even=even[0 to i]+odd[i+1 to len]
special index-> if after deleting element from index i , sum of even index=sum of odd index approach-> after deleting ,previous element at odd index will be now at even index and vice versa s_odd= odd[0 to i]+ even[i+1 to len] s_even=even[0 to i]+odd[i+1 to len]