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

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發送短信 : Number of 4-kings in bipartite tournaments with no 3-kings