static int maxAlternateSum ( int arr [ ] , int n ) {
  if ( n == 1 ) return arr [ 0 ] ;
  int dec [ ] = new int [ n ] ;
  int inc [ ] = new int [ n ] ;
  dec [ 0 ] = inc [ 0 ] = arr [ 0 ] ;
  int flag = 0 ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < i ;
    j ++ ) {
      if ( arr [ j ] > arr [ i ] ) {
        dec [ i ] = Math . max ( dec [ i ] , inc [ j ] + arr [ i ] ) ;
        flag = 1 ;
      }
      else if ( arr [ j ] < arr [ i ] && flag == 1 ) inc [ i ] = Math . max ( inc [ i ] , dec [ j ] + arr [ i ] ) ;
    }
  }
  int result = Integer . MIN_VALUE ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( result < inc [ i ] ) result = inc [ i ] ;
    if ( result < dec [ i ] ) result = dec [ i ] ;
  }
  return result ;
}

static int maxAlternateSum ( int arr [ ] , int n ) { if ( n == 1 ) return arr [ 0 ] ; int dec [ ] = new int [ n ] ; int inc [ ] = new int [ n ] ; dec [ 0 ] = inc [ 0 ] = arr [ 0 ] ; int flag = 0 ; for ( int i = 1 ; i < n ; i ++ ) { for ( int j = 0 ; j < i ; j ++ ) { if ( arr [ j ] > arr [ i ] ) { dec [ i ] = Math . max ( dec [ i ] , inc [ j ] + arr [ i ] ) ; flag = 1 ; } else if ( arr [ j ] < arr [ i ] && flag == 1 ) inc [ i ] = Math . max ( inc [ i ] , dec [ j ] + arr [ i ] ) ; } } int result = Integer . MIN_VALUE ; for ( int i = 0 ; i < n ; i ++ ) { if ( result < inc [ i ] ) result = inc [ i ] ; if ( result < dec [ i ] ) result = dec [ i ] ; } return result ; }
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