Function to find maximum equilibrium sum .
int findMaxSum ( int arr [ ] , int n ) { int res = INT_MIN ; for ( int i = 0 ; i < n ; i ++ ) { int prefix_sum = arr [ i ] ; for ( int j = 0 ; j < i ; j ++ ) prefix_sum += arr [ j ] ; int suffix_sum = arr [ i ] ; for ( int j = n - 1 ; j > i ; j -- ) suffix_sum += arr [ j ] ; if ( prefix_sum == suffix_sum ) res = max ( res , prefix_sum ) ; } return res ; }