LeetCode 1700 无法吃午餐的学生数量

简单题，真的是模拟做法

class Solution {
public:
    int countStudents(vector<int>& students, vector<int>& sandwiches) {
        int ans = 0;
        int len = students.size();
        while(true){
            if(students[0] != sandwiches[0]){
                int tmp = students[0];
                students.erase(students.begin());
                students.push_back(tmp);
            }else {
                students.erase(students.begin());
                len--;
                sandwiches.erase(sandwiches.begin());
            }
            int i = 0;
            for(i = 0;i<len;i++){
                if(sandwiches[0] == students[i]){
                    break;
                }
            }
            if(i >=  len){
                break;
            }
        }
        return students.size();
    }
};