發送短信 : The graph relabeling problem and its variants

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