public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int a = scan . nextInt ( ) ;
  int b = scan . nextInt ( ) ;
  int n = scan . nextInt ( ) ;
  double minT = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int x = scan . nextInt ( ) ;
    int y = scan . nextInt ( ) ;
    int v = scan . nextInt ( ) ;
    double s = Math . sqrt ( ( x - a ) * ( x - a ) + ( y - b ) * ( y - b ) ) ;
    double t = s / v ;
    if ( i == 0 ) {
      minT = t ;
    }
    else {
      minT = Math . min ( t , minT ) ;
    }
  }
  System . out . println ( minT ) ;
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int a = scan . nextInt ( ) ; int b = scan . nextInt ( ) ; int n = scan . nextInt ( ) ; double minT = 0 ; for ( int i = 0 ; i < n ; i ++ ) { int x = scan . nextInt ( ) ; int y = scan . nextInt ( ) ; int v = scan . nextInt ( ) ; double s = Math . sqrt ( ( x - a ) * ( x - a ) + ( y - b ) * ( y - b ) ) ; double t = s / v ; if ( i == 0 ) { minT = t ; } else { minT = Math . min ( t , minT ) ; } } System . out . println ( minT ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (floating_point_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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier)))) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))))))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))