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                本章我們會開發一個程序,它能讀寫文件、解析輸入并說明apmatrix類的用法。我們還會實現集合數據結構Set,它會隨著添加元素自動擴充。除了說明這些特性,程序的真正目標是生成一個表示美國一些主要城市間距離的二維表。輸出是這樣的一個表格: ~~~ Atlanta 0 Chicago 700 0 Boston 1100 1000 0 Dallas 800 900 1750 0 Denver 1450 1000 2000 800 0 Detroit 750 300 800 1150 1300 0 Orlando 400 1150 1300 1100 1900 1200 0 Phoenix 1850 1750 2650 1000 800 2000 2100 0 Seattle 2650 2000 3000 2150 1350 2300 3100 1450 0 Atlanta Chicago Boston Dallas Denver Detroit Orlando Phoenix Seattle ~~~ 因為一個城市到自己的距離是0,所以對角線元素全是0。而且,因為從A到B的距離與從B到A的距離相同,因而矩陣的上半部分沒必要打印。
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