Zhejiang University has 40,000 students and provides 2,500 courses. Now given the registered course list of each student, you are supposed to output the student name lists of all the courses.
Input Specification:
Each input file contains one test case. For each case, the first line contains 2 numbers: N (≤40,000), the total number of students, and K (≤2,500), the total number of courses. Then N lines follow, each contains a student's name (3 capital English letters plus a one-digit number), a positive number C (≤20) which is the number of courses that this student has registered, and then followed by C course numbers. For the sake of simplicity, the courses are numbered from 1 to K.
Output Specification:
For each test case, print the student name lists of all the courses in increasing order of the course numbers. For each course, first print in one line the course number and the number of registered students, separated by a space. Then output the students' names in alphabetical order. Each name occupies a line.
Sample Input:
10 5
ZOE1 2 4 5
ANN0 3 5 2 1
BOB5 5 3 4 2 1 5
JOE4 1 2
JAY9 4 1 2 5 4
FRA8 3 4 2 5
DON2 2 4 5
AMY7 1 5
KAT3 3 5 4 2
LOR6 4 2 4 1 5
Sample Output:
1 4
ANN0
BOB5
JAY9
LOR6
2 7
ANN0
BOB5
FRA8
JAY9
JOE4
KAT3
LOR6
3 1
BOB5
4 7
BOB5
DON2
FRA8
JAY9
KAT3
LOR6
ZOE1
5 9
AMY7
ANN0
BOB5
DON2
FRA8
JAY9
KAT3
LOR6
ZOE1关于第三个测试点超时：根据我改了半天，终于发现是换行所导致的。endl比\n要慢！！！（但我不知道会影响这么多，我先是把cin都改成scanf但是在字符串读取出现了问题！.......最后发现就是换行符所导致的超时！
（ 1）加了 ios::sync_with_stdio(0);
cin.tie(0); 运行时间如下：
（2）没加，会慢一些 但是影响不是很大
（3）没把endl换成'\n'，就会导致第三个测试点超时！！！！
#include <iostream>
#include <map>
#include <vector>
#include <algorithm>
using namespace std;
map<int, vector<string>> m;
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int n, k, b, x;
string a;
cin >> n >> k;
while (n--) {
cin >> a >> b;
for (int i = 0; i < b; i++) {
cin >> x;
m[x].push_back(a);
}
}
for (int i = 1; i <= k; i++) {
cout << i << ' ' << m[i].size() << '\n';
sort(m[i].begin(), m[i].end());
for(int j=0;j< m[i].size();j++){
cout<<m[i][j]<<'\n';
}
}
return 0;
}