HDU 1084 What Is Your Grade?

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#define MAX 200
using namespace std;

struct stu{
    int id;
    string time;
};

bool cmp(stu a,stu b){
    return a.time<b.time;
}

int main(){
    int n;
    while(cin >> n && n >=0 ){
        vector<stu> problemNum[6];
        for(int i = 1; i <= n; i ++ ){
            int num;
            cin >> num;
            stu tmp;
            tmp.id = i;
            cin >> tmp.time;
            problemNum[num].push_back(tmp);
        }
        int score[MAX]={0};
        for(int i = 0; i <= 5 ; i++){
            sort(problemNum[i].begin(),problemNum[i].end(),cmp);
            for(int j = 0; j < problemNum[i].size()/2; j ++ ){
                if(i == 0) score[problemNum[i][j].id ]= 50;
                else if( i == 1) score[problemNum[i][j].id] = 65;
                else if( i == 2) score[problemNum[i][j].id] = 75;
                else if( i == 3) score[problemNum[i][j].id] = 85;
                else if( i == 4) score[problemNum[i][j].id] = 95;
                else score[problemNum[i][j].id] = 100;
            }
            for(int j = problemNum[i].size()/2; j < problemNum[i].size(); j ++ ){
                if(i == 0) score[problemNum[i][j].id ]= 50;
                else if( i == 1) score[problemNum[i][j].id] = 60;
                else if( i == 2) score[problemNum[i][j].id] = 70;
                else if( i == 3) score[problemNum[i][j].id] = 80;
                else if( i == 4) score[problemNum[i][j].id] = 90;
                else score[problemNum[i][j].id] = 100;
            }
        }
        for(int i = 1; i <= n ; i ++ ) cout<< score[i]<<endl;
        cout<<endl;
    }
    return 0;
}