發送短信

數:

提供者:

CAPTCHA:

 _    _      ___      _  __    ______            
| || | ||   / _ \\   | |/ //  /_   _//   ____    
| || | ||  / //\ \\  | ' //    -| ||-   |    \\  
| \\_/ || |  ___  || | . \\    _| ||_   | [] ||  
 \____//  |_||  |_|| |_|\_\\  /_____//  |  __//  
  `---`   `-`   `-`  `-` --`  `-----`   |_|`-`   
                                        `-`

Please enter what you see:

發送短信 : The complexity of cyber attacks in a new layered-security model and the maximum-weight, rooted-subtree problem