static int CountPermutation ( int a [ ] , int n ) {
  int ways = 1 ;
  Arrays . sort ( a ) ;
  int size = 1 ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    if ( a [ i ] == a [ i - 1 ] ) {
      size ++ ;
    }
    else {
      ways *= fact [ size ] ;
      size = 1 ;
    }
  }
  ways *= fact [ size ] ;
  return ways ;
}

static int CountPermutation ( int a [ ] , int n ) { int ways = 1 ; Arrays . sort ( a ) ; int size = 1 ; for ( int i = 1 ; i < n ; i ++ ) { if ( a [ i ] == a [ i - 1 ] ) { size ++ ; } else { ways *= fact [ size ] ; size = 1 ; } } ways *= fact [ size ] ; 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) value: (decimal_integer_literal))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (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: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))))) consequence: (block (expression_statement (update_expression (identifier)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (return_statement (identifier))))