下面这是我让AI写的代码，后面接着我的代码，看着除了输入方式不一样之外，好像就没什么差别了，想不明白为什么我自己的代码AC不了，AI的却可以。。。。求大佬解答，感谢

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>

using namespace std;

struct Student {
    string name;
    int id;
    string className;
};

// 比较函数
bool compare(const Student& lhs, const Student& rhs) {
    if (lhs.className != rhs.className) {
        return lhs.className < rhs.className;
    }
    return lhs.id < rhs.id;
}

int main() {
    // 优化 I/O 速度
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    // 尝试处理多组输入，防止 WA
    while (cin >> n) { 
        vector<Student> students(n);
        for (int i = 0; i < n; ++i) {
            cin >> students[i].name >> students[i].id >> students[i].className;
        }

        sort(students.begin(), students.end(), compare);

        for (const auto& s : students) {
            cout << s.name << " " << s.id << " " << s.className << endl;
        }
    }
    return 0;
}

#include <cstdio>
#include "string"
#include "vector"
#include "algorithm"
using namespace std;
struct Student{
    string name;
    int id;
    string className;
    Student(char *_name, int _id, char *_className){
        name = _name;
        id = _id;
        className = _className;
    }
};

bool compare(Student lhs, Student rhs){
    if(lhs.className < rhs.className)   return true;
    else if(lhs.className == rhs.className && lhs.id < rhs.id)  return true;
    else return false;

}

int main() {
    vector<Student> students;

    int n, id;
    char buffer_name[50], buffer_className[50];
    while (scanf("%d", &n) != EOF){
        students.clear();
        while (n --){
            scanf("%s %d %s", buffer_name, &id, buffer_className);
            students.emplace_back(buffer_name, id, buffer_className);
        }
        sort(students.begin(), students.end(), compare);
        for(auto each: students){
            printf("%s %d %s\n", each.name.c_str(), each.id, each.className.c_str());
        }
    }

    return 0;
}