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

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發送短信 : Eigenvalues of the matching derangement graph