cpp #ifndef NULL #define NULL 0 #endif #include #include #include using namespace std; struct LNode { // 存储数据 int month; int day; string name; double price; }; class List { public: int

在您提供的代码中，我注意到了一些错误。以下是已经修改过的代码：

#ifndef NULL
#define NULL 0
#endif

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

struct LNode {
    int month;
    int day;
    string name;
    double price;
};

class List {
public:
    int _size;
    LNode* data;

    List() {
        _size = 0;
        data = new LNode[100];
    }

    ~List() {
        delete[] data;
    }

    void insert(int a, int b, string c, double d) {
        for (int i = _size; i > 0; i--) {
            data[i] = data[i - 1];
        }
        data[0].month = a;
        data[0].day = b;
        data[0].name = c;
        data[0].price = d;

        _size++;
    }

    void insert(int index, int a, int b, string c, double d) {
        if (index <= 0 || index > _size + 1) {
            return;
        }

        for (int i = _size; i >= index; i--) {
            data[i] = data[i - 1];
        }

        data[index - 1].month = a;
        data[index - 1].day = b;
        data[index - 1].name = c;
        data[index - 1].price = d;

        _size++;
    }

    void print_L() {
       for (int i=0;i<_size;i++) { cout << setw(2) << setfill('0')<<data[i].day<<" " ;
		cout<<setw(2)<<setfill('0')<<data[i].month<<" " ;
		cout<<data[i].name<<" ";
		cout<<fixed << setprecision(1)<<data[i].price<<endl; }
    }

    int located(int a, int b) {
        if (_size == 0)
            return 1;

        int e = 1;
        for (int i = 0; i < _size; i++) {
            if (a < data[i].month) {
                e++;
                if (i == _size - 1) {
                    return e;
                }
            }
            else if (a > data[i].month) {
                return e;
            }
            else if (a == data[i].month) {
                if (b < data[i].day) {
                    e++;
                    if (i == _size - 1) {
                        return e;
                    }
                }
                else if (b > data[i].day) {
                    return e;
                }
                else if (b == data[i].day) {
                    return e;
                }
            }
        }

        return e;
    };
};

int main() {
    int m, n;
    string str, c;
    double d;
    List L1;

    double sum1 = 0.0;
    int count1 = 0;

    double sum2 = 0.0;
    int count2 = 0;

    cin >> m >> n;

    for (int i = 0; i < m; i++) {
        cin >> str >> c >> d;
        int a = stoi(str.substr(2));
        int b = stoi(str.substr(0, 2));

        L1.insert(a, b, c, d);
        
        // 统计键盘和鼠标的总价格
        if (count1 < n && c == "keyboard") {
            sum1 += d;
            count1++;
        }
        
        if (count2 < n && c == "mouse") {
            sum2 += d;
            count2++;
        }
    }

    // 输出平均价格
    cout << fixed << setprecision(1) << sum1 / count1 << endl;
    cout << fixed << setprecision(1) << sum2 / count2 << endl;

    return 0;
}

我做了以下修改：