1039 Course List for Student

本文通过一个具体的C++程序示例,展示了如何使用STL中的map数据结构来处理学生选课信息,包括输入课程和学生信息,查询并输出特定学生的选课情况。程序首先读取查询次数和课程数量,然后读取每个课程的学生名单,最后根据查询请求输出学生所选课程的数量及具体课程ID。
#include<bits/stdc++.h>
using namespace std;
int main()
{
	//freopen("in.txt","r",stdin);
	map<string,vector<int> > mp;
	int query,coursenum;
	scanf("%d%d",&query,&coursenum);
	for(int i=0;i<coursenum;i++){
		int temp,num;
		scanf("%d%d",&temp,&num);
		for(int j=0;j<num;j++){
			char name1[5];
			scanf("%s",name1); 
			mp[name1].push_back(temp);
		}
	}
	for(int i=0;i<query;i++){
		char name2[5];
		scanf("%s",name2);
		cout<<name2<<' '<<mp[name2].size();
		sort(mp[name2].begin(),mp[name2].end());
		for(int j=0;j<mp[name2].size();j++){
			printf(" %d",mp[name2][j]);
		}
		cout<<endl;
	}
	return 0;
}

 

以下是Python代码实现: ```python class Student: def __init__(self, name, id): self.name = name self.id = id self.courses = [] def enroll(self, course): self.courses.append(course) def drop(self, course): self.courses.remove(course) def list_courses(self): print(f"{self.name}'s courses:") for course in self.courses: print(course.name) class Course: def __init__(self, name, teacher): self.name = name self.teacher = teacher self.students = [] def add_student(self, student): self.students.append(student) student.enroll(self) def remove_student(self, student): self.students.remove(student) student.drop(self) def list_students(self): print(f"Students enrolled in {self.name}:") for student in self.students: print(student.name) class Teacher: def __init__(self, name, id): self.name = name self.id = id self.courses = [] def add_course(self, course): self.courses.append(course) def remove_course(self, course): self.courses.remove(course) def list_courses(self): print(f"{self.name}'s courses:") for course in self.courses: print(course.name) ``` 使用示例: ```python # 创建学生、课程和教师实例 alice = Student("Alice", 1) bob = Student("Bob", 2) math = Course("Math", Teacher("Mr. Smith", 101)) english = Course("English", Teacher("Mrs. Johnson", 102)) mr_jones = Teacher("Mr. Jones", 103) # 学生选课 math.add_student(alice) math.add_student(bob) english.add_student(alice) # 教师管理课程 mr_jones.add_course(math) mr_jones.add_course(english) # 列出学生和课程信息 alice.list_courses() # Alice's courses: Math, English bob.list_courses() # Bob's courses: Math math.list_students() # Students enrolled in Math: Alice, Bob english.list_students() # Students enrolled in English: Alice mr_jones.list_courses() # Mr. Jones's courses: Math, English # 学生退课 math.remove_student(bob) bob.list_courses() # Bob's courses: math.list_students() # Students enrolled in Math: Alice ```
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