static int countWays ( int arr [ ] , int n ) {
  int pos [ ] = new int [ n ] ;
  int p = 0 , i ;
  for ( i = 0 ;
  i < n ;
  i ++ ) {
    if ( arr [ i ] == 1 ) {
      pos [ p ] = i + 1 ;
      p ++ ;
    }
  }
  if ( p == 0 ) return 0 ;
  int ways = 1 ;
  for ( i = 0 ;
  i < p - 1 ;
  i ++ ) {
    ways *= pos [ i + 1 ] - pos [ i ] ;
  }
  return ways ;
}

static int countWays ( int arr [ ] , int n ) { int pos [ ] = new int [ n ] ; int p = 0 , i ; for ( i = 0 ; i < n ; i ++ ) { if ( arr [ i ] == 1 ) { pos [ p ] = i + 1 ; p ++ ; } } if ( p == 0 ) return 0 ; int ways = 1 ; for ( i = 0 ; i < p - 1 ; i ++ ) { ways *= pos [ i + 1 ] - pos [ i ] ; } return ways ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (update_expression (identifier))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (return_statement (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (array_access array: (identifier) index: (identifier))))))) (return_statement (identifier))))