static int CountPS ( char str [ ] , int n ) {
  int dp [ ] [ ] = new int [ n ] [ n ] ;
  boolean P [ ] [ ] = new boolean [ n ] [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) P [ i ] [ i ] = true ;
  for ( int i = 0 ;
  i < n - 1 ;
  i ++ ) {
    if ( str [ i ] == str [ i + 1 ] ) {
      P [ i ] [ i + 1 ] = true ;
      dp [ i ] [ i + 1 ] = 1 ;
    }
  }
  for ( int gap = 2 ;
  gap < n ;
  gap ++ ) {
    for ( int i = 0 ;
    i < n - gap ;
    i ++ ) {
      int j = gap + i ;
      if ( str [ i ] == str [ j ] && P [ i + 1 ] [ j - 1 ] ) P [ i ] [ j ] = true ;
      if ( P [ i ] [ j ] == true ) dp [ i ] [ j ] = dp [ i ] [ j - 1 ] + dp [ i + 1 ] [ j ] + 1 - dp [ i + 1 ] [ j - 1 ] ;
      else dp [ i ] [ j ] = dp [ i ] [ j - 1 ] + dp [ i + 1 ] [ j ] - dp [ i + 1 ] [ j - 1 ] ;
    }
  }
  return dp [ 0 ] [ n - 1 ] ;
}

static int CountPS ( char str [ ] , int n ) { int dp [ ] [ ] = new int [ n ] [ n ] ; boolean P [ ] [ ] = new boolean [ n ] [ n ] ; for ( int i = 0 ; i < n ; i ++ ) P [ i ] [ i ] = true ; for ( int i = 0 ; i < n - 1 ; i ++ ) { if ( str [ i ] == str [ i + 1 ] ) { P [ i ] [ i + 1 ] = true ; dp [ i ] [ i + 1 ] = 1 ; } } for ( int gap = 2 ; gap < n ; gap ++ ) { for ( int i = 0 ; i < n - gap ; i ++ ) { int j = gap + i ; if ( str [ i ] == str [ j ] && P [ i + 1 ] [ j - 1 ] ) P [ i ] [ j ] = true ; if ( P [ i ] [ j ] == true ) dp [ i ] [ j ] = dp [ i ] [ j - 1 ] + dp [ i + 1 ] [ j ] + 1 - dp [ i + 1 ] [ j - 1 ] ; else dp [ i ] [ j ] = dp [ i ] [ j - 1 ] + dp [ i + 1 ] [ j ] - dp [ i + 1 ] [ j - 1 ] ; } } return dp [ 0 ] [ n - 1 ] ; }
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