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                最后,我們準備把數據從文件讀入一個矩陣中。具體來說,每個城市在該矩陣中都一個相應的行和列。 我們將在main函數中創建該矩陣,它會剩余大量空間: ~~~ apmatrix<int> distances (50, 50, 0); ~~~ 在processLine內部,我們從Set中得到兩個城市的索引,并以這兩個索引為矩陣的索引,向矩陣中添加了新信息: ~~~ int dist = convertToInt (distString); int index1 = cities.add (city1); int index2 = cities.add (city2); distances[index1][index2] = distance; distances[index2][index1] = distance; ~~~ 最后,在main函數中我們可以將信息以可讀的形式打印出來: ~~~ for (int i=0; i<cities.getNumElements(); i++) { cout << cities.getElement(i) << "\t"; for (int j=0; j<=i; j++) { cout << distances[i][j] << "\t"; } cout << endl; } cout << "\t"; for (int i=0; i<cities.getNumElements(); i++) { cout << cities.getElement(i) << "\t"; } cout << endl; ~~~ 這段代碼的輸出就是本章開頭的矩陣。原始數據可以從本書網站獲取。
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