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

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發送短信 : Optimal orientations of products of paths and cycles