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

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Text this: Xây dựng Singer và bài toán hit