Submission #854389

#	Time	Username	Problem	Language	Result	Execution time	Memory
854389		anhphant	Job Scheduling (CEOI12_jobs)	C++14	0 / 100	11 ms	1628 KiB

jobs

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

ll N, D, M, A[100007];

void initialize() {
    ios_base :: sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> N >> D >> M;
    for(int i = 1; i <= M; ++i) {
        cin >> A[i];
    }
    sort(A + 1, A + 1 + M);
    
    //for(int i = 1; i <= M; ++i) cerr << A[i] << " "; cerr << endl;
}

bool check(ll MachinesCnt) {
    //cerr << "MachinesCnt = " << MachinesCnt << endl;
    int idx = 1;
    
    for(int day = 1; day <= N; ++day) {
        //cerr << "Day " << day << " : " << endl;
        ll used_machines_in_day = 0;
        while(idx <= M && used_machines_in_day < MachinesCnt) {
            if (day < A[idx] || A[idx] + D < day) break;
            
            //cerr << "job " << idx << " is going to work with time at " << A[idx] << endl;
            
            used_machines_in_day++;
            idx++;
        }
        
        //cerr << "used_machines_in_day : " << used_machines_in_day << endl;
        //cerr << "used_machines_all_times : " << idx - 1 << endl;
        //cerr << endl;
    }
    
    return idx > M;
}

void process() {
    ll l = 1, r = N;
    while(l < r) {
        ll mid = (l + r) / 2;
        if (check(mid)) r = mid;
        else l = mid + 1;
    }
    
    cout << l;
}

int main() {
    initialize();
    process();
}

• Subtask 1: 0 / 100