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

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發送短信 : Some formulas and bounds for the bandwidth of graphs