题解：实在做不出来，用deepseek做

deepseek是真NB啊，第一次用AI做出题，不像Chat GPT全是错

#include <iostream>
#include <map>
#include <string>
#include <iomanip> // 用于控制输出格式

using namespace std;

// 定义学生结构体
struct Student {
    string name;
    string number;
    int chinese;
    int math;
};

int main() {
    int n, m;
    cin >> n >> m;

    // 使用map存储学生信息，key为姓名或学号
    map<string, Student> nameMap; // 按姓名查找
    map<string, Student> numberMap; // 按学号查找

    // 输入n个学生的信息
    for (int i = 0; i < n; i++) {
        Student stu;
        cin >> stu.name >> stu.number >> stu.chinese >> stu.math;
        nameMap[stu.name] = stu; // 将学生信息存入nameMap
        numberMap[stu.number] = stu; // 将学生信息存入numberMap
    }

    // 处理m次查询
    for (int i = 0; i < m; i++) {
        string type, query;
        cin >> type >> query;

        if (type == "name") {
            // 查询姓名
            if (nameMap.find(query) != nameMap.end()) {
                Student stu = nameMap[query];
                cout << stu.chinese << " " << stu.math << endl;
            } else {
                cout << "Not found" << endl;
            }
        } else if (type == "number") {
            // 查询学号
            if (numberMap.find(query) != numberMap.end()) {
                Student stu = numberMap[query];
                double average = (stu.chinese + stu.math) / 2.0;
                cout << fixed << setprecision(2) << average << endl;
            } else {
                cout << "Not found" << endl;
            }
        } else {
            cout << "Invalid query type" << endl;
        }
    }

    return 0;
}