static long countStrs ( int n ) {
  long [ ] [ ] dp = new long [ n + 1 ] [ 27 ] ;
  for ( int i = 0 ;
  i < n + 1 ;
  i ++ ) {
    for ( int j = 0 ;
    j < 27 ;
    j ++ ) {
      dp [ i ] [ j ] = 0 ;
    }
  }
  for ( int i = 0 ;
  i <= 25 ;
  i ++ ) {
    dp [ 1 ] [ i ] = 1 ;
  }
  for ( int i = 2 ;
  i <= n ;
  i ++ ) {
    for ( int j = 0 ;
    j <= 25 ;
    j ++ ) {
      if ( j == 0 ) {
        dp [ i ] [ j ] = dp [ i - 1 ] [ j + 1 ] ;
      }
      else {
        dp [ i ] [ j ] = ( dp [ i - 1 ] [ j - 1 ] + dp [ i - 1 ] [ j + 1 ] ) ;
      }
    }
  }
  long sum = 0 ;
  for ( int i = 0 ;
  i <= 25 ;
  i ++ ) {
    sum = ( sum + dp [ n ] [ i ] ) ;
  }
  return sum ;
}

static long countStrs ( int n ) { long [ ] [ ] dp = new long [ n + 1 ] [ 27 ] ; for ( int i = 0 ; i < n + 1 ; i ++ ) { for ( int j = 0 ; j < 27 ; j ++ ) { dp [ i ] [ j ] = 0 ; } } for ( int i = 0 ; i <= 25 ; i ++ ) { dp [ 1 ] [ i ] = 1 ; } for ( int i = 2 ; i <= n ; i ++ ) { for ( int j = 0 ; j <= 25 ; j ++ ) { if ( j == 0 ) { dp [ i ] [ j ] = dp [ i - 1 ] [ j + 1 ] ; } else { dp [ i ] [ j ] = ( dp [ i - 1 ] [ j - 1 ] + dp [ i - 1 ] [ j + 1 ] ) ; } } } long sum = 0 ; for ( int i = 0 ; i <= 25 ; i ++ ) { sum = ( sum + dp [ n ] [ i ] ) ; } return sum ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal))) dimensions: (dimensions_expr (decimal_integer_literal))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (decimal_integer_literal))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (decimal_integer_literal)) index: (identifier)) right: (decimal_integer_literal))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))))) alternative: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (parenthesized_expression (binary_expression left: (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (binary_expression left: (identifier) right: (decimal_integer_literal))))))))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)))))))) (return_statement (identifier))))