private static void dfs ( int [ ] x , int [ ] y , int [ ] arr , int a ) {
  arr [ a ] = 1 ;
  for ( int i = 0 ;
  i < x . length ;
  i ++ ) {
    if ( ( x [ a ] == x [ i ] || y [ a ] == y [ i ] ) && arr [ i ] == 0 ) {
      dfs ( x , y , arr , i ) ;
    }
  }
}

private static void dfs ( int [ ] x , int [ ] y , int [ ] arr , int a ) { arr [ a ] = 1 ; for ( int i = 0 ; i < x . length ; i ++ ) { if ( ( x [ a ] == x [ i ] || y [ a ] == y [ i ] ) && arr [ i ] == 0 ) { dfs ( x , y , arr , i ) ; } } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (integral_type) dimensions: (dimensions)) name: (identifier)) (formal_parameter type: (array_type element: (integral_type) dimensions: (dimensions)) name: (identifier)) (formal_parameter type: (array_type element: (integral_type) dimensions: (dimensions)) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (expression_statement (assignment_expression left: (array_access array: (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: (field_access object: (identifier) field: (identifier))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier))))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier) (identifier) (identifier))))))))))