public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int runs = sc . nextInt ( ) ;
  while ( runs -- > 0 ) {
    int n = sc . nextInt ( ) ;
    int s = sc . nextInt ( ) ;
    int k = sc . nextInt ( ) ;
    ArrayList < Integer > arr = new ArrayList < > ( ) ;
    for ( int i = 0 ;
    i < k ;
    i ++ ) arr . add ( sc . nextInt ( ) ) ;
    for ( int i = 0 ;
    i <= k ;
    i ++ ) {
      if ( s - i >= 1 && ! arr . contains ( s - i ) ) {
        System . out . println ( i ) ;
        break ;
      }
      if ( s + i <= n && ! arr . contains ( s + i ) ) {
        System . out . println ( i ) ;
        break ;
      }
    }
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int runs = sc . nextInt ( ) ; while ( runs -- > 0 ) { int n = sc . nextInt ( ) ; int s = sc . nextInt ( ) ; int k = sc . nextInt ( ) ; ArrayList < Integer > arr = new ArrayList < > ( ) ; for ( int i = 0 ; i < k ; i ++ ) arr . add ( sc . nextInt ( ) ) ; for ( int i = 0 ; i <= k ; i ++ ) { if ( s - i >= 1 && ! arr . contains ( s - i ) ) { System . out . println ( i ) ; break ; } if ( s + i <= n && ! arr . contains ( s + i ) ) { System . out . println ( i ) ; break ; } } } }
(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)))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (identifier)) right: (decimal_integer_literal))) 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: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (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: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (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 (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)) right: (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier))))))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (break_statement))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier)) right: (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier))))))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (break_statement)))))))))