PAT——Course List for Student

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这篇博客介绍了一个C++程序，用于处理浙江大学40000名学生和2500门课程的注册信息查询。程序通过map数据结构实现了一对多的映射，有效地查找每个学生注册的课程。输入包括学生数量、课程数量，以及每个学生的名字和他们注册的课程。输出按照学生的查询顺序显示每个学生的名字、注册课程数量及课程编号。博客强调了在实际编程中利用数据结构优化查询效率的重要性。

题目

Zhejiang University has 40000 students and provides 2500 courses. Now given the student name lists of all the courses, you are supposed to output the registered course list for each student who comes for a query.

Input Specification:
Each input file contains one test case. For each case, the first line contains 2 positive integers: N (≤40,000), the number of students who look for their course lists, and K (≤2,500), the total number of courses. Then the student name lists are given for the courses (numbered from 1 to K) in the following format: for each course i, first the course index i and the number of registered students Ni (≤200) are given in a line. Then in the next line, Ni
student names are given. A student name consists of 3 capital English letters plus a one-digit number. Finally the last line contains the N names of students who come for a query. All the names and numbers in a line are separated by a space.

Output Specification:
For each test case, print your results in N lines. Each line corresponds to one student, in the following format: first print the student’s name, then the total number of registered courses of that student, and finally the indices of the courses in increasing order. The query results must be printed in the same order as input. All the data in a line must be separated by a space, with no extra space at the end of the line.

Sample Input:

11 5
4 7
BOB5 DON2 FRA8 JAY9 KAT3 LOR6 ZOE1
1 4
ANN0 BOB5 JAY9 LOR6
2 7
ANN0 BOB5 FRA8 JAY9 JOE4 KAT3 LOR6
3 1
BOB5
5 9
AMY7 ANN0 BOB5 DON2 FRA8 JAY9 KAT3 LOR6 ZOE1
ZOE1 ANN0 BOB5 JOE4 JAY9 FRA8 DON2 AMY7 KAT3 LOR6 NON9

Sample Output:

ZOE1 2 4 5
ANN0 3 1 2 5
BOB5 5 1 2 3 4 5
JOE4 1 2
JAY9 4 1 2 4 5
FRA8 3 2 4 5
DON2 2 4 5
AMY7 1 5
KAT3 3 2 4 5
LOR6 4 1 2 4 5
NON9 0

AC代码

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,k;
	cin>>n>>k;
//	vector<int> vec[n];
	map<string,vector<int> > maps;
	for(int i=0;i<k;i++)
	{
		int index,num;
		cin>>index>>num;
		for(int j=0;j<num;j++)
		{
			string tmp;
			cin>>tmp;
			maps[tmp].push_back(index);
		}
	}
	string s[n];
	for(int i=0;i<n;i++)
	cin>>s[i];
	
	for(int i=0;i<n;i++)
	{
		cout<<s[i];
		vector<int> tmp=maps[s[i]];
		sort(tmp.begin(),tmp.end());
		cout<<" "<<tmp.size();
		for(int i=0;i<tmp.size();i++)
		cout<<" "<<tmp[i];
		cout<<endl;
	}
}