static int maxSum ( int arr [ ] , int n ) {
  int cum_sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) cum_sum += arr [ i ] ;
  int curr_val = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) curr_val += i * arr [ i ] ;
  int res = curr_val ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    int next_val = curr_val - ( cum_sum - arr [ i - 1 ] ) + arr [ i - 1 ] * ( n - 1 ) ;
    curr_val = next_val ;
    res = Math . max ( res , next_val ) ;
  }
  return res ;
}

static int maxSum ( int arr [ ] , int n ) { int cum_sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) cum_sum += arr [ i ] ; int curr_val = 0 ; for ( int i = 0 ; i < n ; i ++ ) curr_val += i * arr [ i ] ; int res = curr_val ; for ( int i = 1 ; i < n ; i ++ ) { int next_val = curr_val - ( cum_sum - arr [ i - 1 ] ) + arr [ i - 1 ] * ( n - 1 ) ; curr_val = next_val ; res = Math . max ( res , next_val ) ; } return res ; }
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