static int findS ( int s ) {
  int sum = 0 ;
  for ( int n = 1 ;
  sum < s ;
  n ++ ) {
    sum += n ;
    if ( sum == s ) return n ;
  }
  return - 1 ;
}

static int findS ( int s ) { int sum = 0 ; for ( int n = 1 ; sum < s ; n ++ ) { sum += n ; if ( sum == s ) return n ; } return - 1 ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (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 (expression_statement (assignment_expression left: (identifier) right: (identifier))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (return_statement (identifier))))) (return_statement (unary_expression operand: (decimal_integer_literal)))))