Submission #104835

#	Time	Username	Problem	Language	Result	Execution time	Memory
104835		daili	Job Scheduling (CEOI12_jobs)	C++14	0 / 100	96 ms	8740 KiB

jobs

#include <bits/stdc++.h>

using namespace std;

bool check(vector<pair<int,int>> &allJobs, int currNr, int delay, int days)
{
    if (currNr == 0)
    {
        return false;
    }
    vector<int> busy(days+1);
    for (int i = 0; i < allJobs.size(); i++)
    {
        int day = allJobs[i].first;
        while(day < days + 1 && busy[day] >= currNr)
        {
            day++;
        }
        if (day >= days + 1)
        {
            return false;
        }
        if (allJobs[i].second + delay < day)
        {
            return false;
        }
        else
        {
            busy[day]++;
        }
    }
    return true;
}

/*void print(vector<pair<int,int>> &allJobs, int days, int nr)
{
  vector<vector<int>> busy(days+1);
  for (int i = 0; i < allJobs.size(); i++)
  {
      int day = allJobs[i].first;
      while(busy[day].size() >= nr)
      {
          day++;
      }
      busy[day].push_back(allJobs[i].second);
  }

  for (int i = 1; i <= days; i++)
  {
    for (auto j: busy[i])
    {
      cout << j << " ";
    }
    cout << 0 << "\n";
  }
}
*/


int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, d, m;
    cin >> n >> d >> m;

    vector<pair<int,int>> allJobs;
    for (int i = 0; i < m; i++)
    {
        int x;
        cin >> x;
        allJobs.push_back({x, i+1});
    }

    /*for (int i = 1; i <= m; i++)
    {
        if (check(allJobs, i, d, n))
        {
            cout << i << "\n";
            print(allJobs, n, i);
            return 0;
        }
    }*/

    int left = 0;
    int right = m;

    while(left <= right)
    {
        int mid = (left + right) >> 1;

        if (check(allJobs, mid, d, n))
        {
            right = mid - 1;
        }
        else
        {
            left = mid + 1;
        }
    }

    int mid = (left+right) >> 1;

    if (mid >= 2 && check(allJobs, mid-1, d, n))
    {
        cout << mid - 1 << "\n";
        //print(allJobs, n, mid-1);
    }
    else if (check(allJobs, mid, d, n))
    {
        cout << mid << "\n";
        //print(allJobs, n, mid);
    }
    else if (check(allJobs, mid + 1, d, n))
    {
        cout << mid + 1 << "\n";
        //print(allJobs, n, mid + 1);
    }
    else
    {
        cout << mid + 2 << "\n";
       // print(allJobs, n, mid + 2);
    }
}

Compilation message (stderr)

jobs.cpp: In function 'bool check(std::vector<std::pair<int, int> >&, int, int, int)':
jobs.cpp:12:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < allJobs.size(); i++)
                     ~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100