Submission #1270351

#	Time	Username	Problem	Language	Result	Execution time	Memory
1270351		victorj0902	Job Scheduling (CEOI12_jobs)	C++20	55 / 100	123 ms	20060 KiB

jobs

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

struct job {
    int time;
    int idx;
    bool operator < (const job &other) const {
        return time < other.time;
    }
};

const int MAX_M = 1e6 + 10;

job a[MAX_M];
vector<vector<int>> ans(100010);
int n, m, d;

bool check(int k) {
    int cur_day = 1;
    for (int i = 1; i <= m; i += k) {
        if (cur_day > n) return false;
        if (a[i].time < cur_day) return false;
        cur_day++;
    }
    return true;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n >> d >> m;

    for (int i = 1; i <= m; i++) {
        cin >> a[i].time;
        a[i].time += d;      // Adjust deadline
        a[i].idx = i;        // Original index
    }

    sort(a + 1, a + m + 1);  // Sort by deadline (time)

    // Binary search to find minimum number of machines per day
    int l = 1, r = m;
    int best_k = m;

    while (l <= r) {
        int mid = (l + r) / 2;
        if (check(mid)) {
            best_k = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }

    cout << best_k << '\n';

    // Assign jobs into groups of size `best_k`
    for (int i = 1; i <= m; i++) {
        int day = ((i - 1) / best_k) + 1;
        ans[day].push_back(a[i].idx);
    }

    // Output exactly `n` lines, each ending with 0
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j < ans[i].size(); j++) {
            cout << ans[i][j] << " ";
        }
        cout << "0\n";
    }

    return 0;
}

• Subtask 1: 55 / 100