Submission #925537

#	Time	Username	Problem	Language	Result	Execution time	Memory
925537		allw	Job Scheduling (CEOI12_jobs)	C++17	75 / 100	1068 ms	16540 KiB

jobs

#include <iostream>
#include <vector>
#include <algorithm>
 
bool run(std::vector<std::pair<int, int>>& a, int d, int x, 
         std::vector<std::vector<int>>& answer) {
    int i = 0;
    for (int j = 1; i < a.size() && j < answer.size(); ++j) {
        for (int k = 0; i < a.size() && k < x; ++k) {

            if (a[i].first + d < j) return false;
            if (j >= a[i].first && j <= a[i].first + d) {
                answer[j].push_back(a[i].second);
                ++i;
            }
        }
    } 
 
    return i == a.size();
}
 
int main() {
    int n, d, m;
    std::cin >> n >> d >> m;
    std::vector<std::pair<int, int>> a(m, {0, 0});
 
    for (int i = 0; i < m; ++i) {
        std::cin >> a[i].first;
        a[i].second = i + 1;
    }
    std::sort(a.begin(), a.end());
 
    int l = 0;
    int r = m;
    std::vector<std::vector<int>> answer;
    // (l, r]
    while (l + 1 < r) {
        answer = std::vector<std::vector<int>>(n + 1, std::vector<int>());
        int middle = (l + r) / 2;
        if (run(a, d, middle, answer)) {
            r = middle;
        } else {
            l = middle;
        }
    }
 
    answer = std::vector<std::vector<int>>(n + 1, std::vector<int>());
    run(a, d, r, answer);
    std::cout << r << '\n';
 
    for (int i = 1; i <= n; ++i) {
        for (size_t j = 0; j < answer[i].size(); ++j) {
            std::cout << answer[i][j] << ' ';
        }
        std::cout << "0\n";
    }
}

Compilation message (stderr)

jobs.cpp: In function 'bool run(std::vector<std::pair<int, int> >&, int, int, std::vector<std::vector<int> >&)':
jobs.cpp:8:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     for (int j = 1; i < a.size() && j < answer.size(); ++j) {
      |                     ~~^~~~~~~~~~
jobs.cpp:8:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     for (int j = 1; i < a.size() && j < answer.size(); ++j) {
      |                                     ~~^~~~~~~~~~~~~~~
jobs.cpp:9:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |         for (int k = 0; i < a.size() && k < x; ++k) {
      |                         ~~^~~~~~~~~~
jobs.cpp:19:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     return i == a.size();
      |            ~~^~~~~~~~~~~

• Subtask 1: 75 / 100