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             ___    __    __    ______            
    ___     / _ \\  \ \\ / //  /_   _//   ____    
   /   ||  / //\ \\  \ \/ //    -| ||-   |    \\  
  | [] || |  ___  ||  \  //     _| ||_   | [] ||  
   \__ || |_||  |_||   \//     /_____//  |  __//  
    -|_|| `-`   `-`     `      `-----`   |_|`-`   
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發送短信 : Approximation Algorithm for Multi-Product Newsboy Problem with Stochastic Yield