發送短信 : Efficiency comparisons between k-centers and k-means algorithms

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