public static boolean judgeSquareSum ( int n ) {
  for ( int i = 2 ;
  i * i <= n ;
  i ++ ) {
    int count = 0 ;
    if ( n % i == 0 ) {
      while ( n % i == 0 ) {
        count ++ ;
        n /= i ;
      }
      if ( i % 4 == 3 && count % 2 != 0 ) return false ;
    }
  }
  return n % 4 != 3 ;
}

public static boolean judgeSquareSum ( int n ) { for ( int i = 2 ; i * i <= n ; i ++ ) { int count = 0 ; if ( n % i == 0 ) { while ( n % i == 0 ) { count ++ ; n /= i ; } if ( i % 4 == 3 && count % 2 != 0 ) return false ; } } return n % 4 != 3 ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (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: (binary_expression left: (identifier) right: (identifier)) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) consequence: (block (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) body: (block (expression_statement (update_expression (identifier))) (expression_statement (assignment_expression left: (identifier) right: (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal)) right: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal)))) consequence: (return_statement (false))))))) (return_statement (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal)))))