發送短信 : Efficient and practical algorithms for discrete geodesics

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