要求用C++实现如下：1）课程的增加、修改和删除、查询2）学生成绩的增加、修改、删除、查询3）统计所有学生每门功课的平均值、最大值、最小值4）统计单个学生的所有课程的平均值、最大值和最小值

#include "pch.h"
#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <fstream>
using namespace std;

class Student {
public:
	string name;
	string id;
	vector<pair<string, int>> scores;
	Student(string& n, string& i) {
		name = n;
		id = i;
		scores = vector<pair<string, int>>();
	}
	Student() {
		name = "";
		id = "";
		scores = vector<pair<string, int>>();
	}
	void add_score(pair<string, int>& s) {
		scores.push_back(s);
	}
	void print() {
		cout << "name:" << name << " id:" << id << endl;
		for (auto i : scores)
		{