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#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<stack>
#include<queue>
#include<utility>
#include<vector>
#include<cmath>
#include<set>
#include<map>
#include<iostream>
#include<algorithm>
#include<sstream>
using namespace std;
typedef long long LL;
struct Stu{  //学生
    int id;
    int time;
    friend bool operator < (const Stu s1, const Stu s2){
        if(s1.time != s2.time){
            return s1.time > s2.time;
        }else{
            return s1.id > s2.id;
        }
    }
};
typedef struct Stu Stu;
struct Node{  //学生路线的结点
    int office;
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