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 ______      ___     __   __     ___     _    _   
|      \\   / _ \\   \ \\/ //   / _ \\  | \  / || 
|  --  //  / //\ \\   \   //   | / \ || |  \/  || 
|  --  \\ |  ___  ||  / . \\   | \_/ || | .  . || 
|______// |_||  |_|| /_//\_\\   \___//  |_|\/|_|| 
`------`  `-`   `-`  `-`  --`   `---`   `-`  `-`

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發送短信 : Linear complexity, k-error linear complexity, and the discrete Fourier transform