写出c++代码：Design a Student Grade Management Program with C++ STL (Phase 1) Data Structures: class CStudent, includes the following data members: nID (integer) (学号) strName (string) （学生姓名） mapScores (Store the course numbers (integer) and scores (double) of all courses using a map container) 注：mapScores（用map容器存储修读过的所有课程的课程号（整型）和成绩（double）） Data storage: store all students' data in some kind of appropriate STL container. 注：用某种适当的STL容器存储所有学生的数据 Add three student data (each student takes several courses) to the container, and output the information of all students in the container. Data maintenance: Implement the functions of adding, deleting, modifying, and querying student data. 注：实现对学生数据的数据维护，包括增、删、改、查功能（增、删、改、查学生信息，以及各科成绩）

抱歉，我可以回答您的问题。以下是一个简单的C++代码，用于创建一个包含学生姓名、学号和各科成绩的成绩管理程序：

#include <iostream>
#include <string>
#include <map>
#include <vector>

class CStudent {
public:
CStudent() {}
CStudent(int id, std::string name) : nID(id), strName(name) {}
int getID() const { return nID; }
std::string getName() const { return strName; }
void addScore(int courseID, double score) { mapScores[courseID] = score; }
double getScore(int courseID) const {
auto it = mapScores.find(courseID);
if (it != mapScores.end()) {
return it->second;
} else {
return -1.0;
}
}
void print() const {
std::cout << "ID: " << nID << ", Name: " << strName << "\n";
std::cout << "Scores: \n";
for (auto it = mapScores.begin(); it != mapScores.end(); ++it) {
std::cout << " Course " << it->first << ": " << it->second << "\n";
}
}
private:
int nID;
std::string strName;
std::map<int, double> mapScores;
};

class CGradeManager {
public:
void addStudent(const CStudent& student) {
students.push_back(student);
}
void removeStudent(int id) {
for (auto it = students.begin(); it != students.end(); ++it) {
if (it->getID() == id) {
students.erase(it);
return;
}
}
}
void updateStudent(const CStudent& student) {
for (auto it = students.begin(); it != students.end(); ++it) {
if (it->getID() == student.getID()) {
*it = student;
return;
}
}
}
CStudent getStudent(int id) const {
for (auto it = students.begin(); it != students.end(); ++it) {
if (it->getID() == id) {
return *it;
}
}
return CStudent();
}
void printAll() const {
for (auto it = students.begin(); it != students.end(); ++it) {
it->print();
std::cout << "\n";
}
}
private:
std::vector<CStudent> students;
};

int main() {
CGradeManager manager;
CStudent student1(123, "Tom");
student1.addScore(1, 80);
student1.addScore(2, 90);
student1.addScore(3, 85);
CStudent student2(456, "Jerry");
student2.addScore(1, 70);
student2.addScore(2, 95);
student2.addScore(4, 90);
CStudent student3(789, "Alice");
student3.addScore(1, 95);
student3.addScore(3, 90);
manager.addStudent(student1);
manager.addStudent(student2);
manager.addStudent(student3);
std::cout << "All Students:\n";
manager.printAll();
std::cout << "\n";
CStudent student4(123, "Tim");
student4.addScore(1, 85);
manager.updateStudent(student4);
std::cout << "After Update:\n";
manager.printAll();
std::cout << "\n";
manager.removeStudent(789);
std::cout << "After Remove:\n";
manager.printAll();
std::cout << "\n";
return 0;
}