제약조건이나 엣지값이 안 맞는지 30점 나오네요,,ㅜㅜ

#include <iostream>
#include <stdio.h>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

void check_time(vector<vector<int>> &ava_time, int index, int start, int end) {
    for (int i = start; i < end; i++) {
        for (int j = 0; j < ava_time[index].size(); j++) {
            if (ava_time[index][j] == i)ava_time[index].erase(ava_time[index].begin() + j);
        }
    }
}

int main() {
    int num_room, use_room;
    cin >> num_room >> use_room;
    vector<vector<int>> ava_time;
    vector<string> rooms;
    string a;
    //9-18
    for (int i = 0; i < num_room; i++) {
        cin >> a;
        rooms.push_back(a);
        vector<int> hours = { 9,10,11,12,13,14,15,16,17,18 };
        ava_time.push_back(hours);
    }
    sort(rooms.begin(), rooms.end());
    for (int j = 0; j < use_room; j++) {
        cin >> a;
        int bg, en, index = 0;
        cin >> bg >> en;
        for (int k = 0; k < num_room; k++) {
            if (rooms[k] == a) index = k;
        }
        check_time(ava_time,index, bg, en);
    }
    for (int i = 0; i < num_room; i++) {
        cout << "Room "<<rooms[i]<<":" << endl;
        int ran = ava_time[i][0];
        int count = 0;
        int where = 0;
        int avail = 0;
        vector<string> ans;
        for (int j = 9; j <= 18; j++) {
            if (ran == 18) {
                cout << "Not available" << endl;
                break;
            }
            if (ava_time[i][where] == j && j!=18) {
                count++;
                where++;
            }
            else if (ava_time[i][where] == 18 && j==18) {
                if (count != 0) {
                    string aa = to_string(j - count) + "-" + to_string(j);
                    ans.push_back(aa);
                    avail++;
                }
            }
            else {
                if (count != 0) {
                    string aa;
                    if(j-count == 9) aa = "09-" + to_string(j);
                    else aa = to_string(j - count) + "-" + to_string(j);
                    ans.push_back(aa);
                    avail++;
                }
                count = 0;
            }
        }
        if (avail != 0) {
            cout << avail << " available:" << endl;
            for (int ll = 0; ll < ans.size(); ll++) cout << ans[ll] << endl;
        }
        if(i != num_room-1) cout <<"-----"<< endl;
    }
    return 0;
}