Question

我认为我的代码是自我解释的。

public Town[] GetShortestDistanceBetweenTowns() {
    Town[] allTowns = getTowns();
    Town[] bestPath = allTowns;
    int bestDistance = CalculateDistance(bestPath);
    int newDistance = bestDistance;

    //shuffle allTowns array and look for best distance
    for(int i=0; i<100; i++) {
        MixArray(allTowns);
        newDistance = CalculateDistance(allTowns);

        if (newDistance < bestDistance) {
            bestPath = allTowns;
            bestDistance = newDistance;
        }
    }

    return bestPath;
}

问题是，当我使用MixArray(allTowns)时，它也会改变我的bestPath数组的顺序。我想在这个数组中只保留最佳顺序。我该怎么办？

Answer 1

import pandas as pd toclean = pd.ExcelFile(r'C:\Users\Desktop\New Microsoft Excel Worksheet.xlsx',sheetname=0) df4 = toclean.drop_duplicates(subset='A', keep='last') df4.save(r'C:\Users\Desktop\final.xlsx')是一种引用类型，因此Town表示Town[] bestPath = allTowns;始终与bestPath匹配。要复制，您可以为allTowns类实现IClonable，或者只是添加一个复制函数，用于创建具有重复值的新Town。

这是一篇关于参考与价值类型的精彩文章： http://www.albahari.com/valuevsreftypes.aspx

跟踪数组元素顺序

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