static public int LongestSubarray ( int arr [ ] , int n , int k ) {
  int count = 1 ;
  int max_length = 1 ;
  int prev_mod = arr [ 0 ] % k ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    int curr_mod = arr [ i ] % k ;
    if ( curr_mod == prev_mod ) {
      count ++ ;
    }
    else {
      max_length = Math . max ( max_length , count ) ;
      count = 1 ;
      prev_mod = curr_mod ;
    }
  }
  return max_length ;
}

static public int LongestSubarray ( int arr [ ] , int n , int k ) { int count = 1 ; int max_length = 1 ; int prev_mod = arr [ 0 ] % k ; for ( int i = 1 ; i < n ; i ++ ) { int curr_mod = arr [ i ] % k ; if ( curr_mod == prev_mod ) { count ++ ; } else { max_length = Math . max ( max_length , count ) ; count = 1 ; prev_mod = curr_mod ; } } return max_length ; }
(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)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (identifier)))) (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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (update_expression (identifier)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))) (expression_statement (assignment_expression left: (identifier) right: (identifier))))))) (return_statement (identifier))))