PTA 甲级 1039 Course List for Student

题目链接

set会自动去重和排序

#include
using namespace std;
mapint>> name_c;
int main(){
    int n,k;
    cin>>n>>k;//n个学生，k个课程 1-k
    int idx=1;
    for(int i=0;i
        int course_id,stu_ct;
        cin>>course_id>>stu_ct;
        for(int j=0;j
            string stu_name;
            cin>>stu_name;
            name_c[stu_name].insert(course_id);
        }
    }
    for(int i=0;i
        string name;
        cin>>name;
        cout<" ";
        cout<size();
        for(auto& x:name_c[name]){
            cout<<" "<
        }
        cout<
    }
    return 0;
}