Submission #642468

#	Time	Username	Problem	Language	Result	Execution time	Memory
642468		accidentac	Job Scheduling (CEOI12_jobs)	C++14	0 / 100	215 ms	7356 KiB

jobs

#include <bits/stdc++.h>
using namespace std;

// return true if can use count no. of machines to handle all jobs
bool ok(int count, int n, int d, int m, vector<array<int, 2>>& jobs) {
  for (int i = 1, start = 0, end = 0; i <= n; i++) {
    while (end < m && jobs[end][0] <= i) {
      end++;
    }
    int cur = 0;
    while (start < end && cur < count && cur < m) {
      if (i - jobs[start][0] > d) return false;
      start++;
      cur++;
      if (start == m) return true;
    }
  }
  return false;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, d, m;
  cin >> n >> d >> m;
  vector<array<int, 2>> jobs(m);
  for (int i = 0; i < m; i++) {
    cin >> jobs[i][0];
    jobs[i][1] = i + 1;
  }
  sort(jobs.begin(), jobs.end());
  int lo = 1, hi = m, ans = m;
  while (lo <= hi) {
    int mid = lo + (hi - lo) / 2;
    if (ok(mid, n, d, m, jobs)) {
      ans = mid;
      hi = mid - 1;
    } else {
      lo = mid + 1;
    }
  }
  cout << ans << endl;
}

• Subtask 1: 0 / 100