Submission #925533

#	Time	Username	Problem	Language	Result	Execution time	Memory
925533		allw	Job Scheduling (CEOI12_jobs)	C++17	60 / 100	332 ms	23852 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) {
            
    if (false) {
    for (int i = 0; i < a.size(); ++i) {
        std::cout << '(' << a[i].first << ", " << a[i].second << ") ";
    }
    std::cout << '\n';
    }

    int i = 0;
    for (int j = 1; i < a.size() && j < answer.size(); ++j) {
        //std::cout << i << ' ' << a[i].first << ' ' << j << '\n';
        if (a[i].first + d < j) {
        //    std::cout << "======\n";
            return false;
        }

        int v = x;
        while (i < a.size() && v > 0 && j >= a[i].first && j <= a[i].first + d) {
            answer[j].push_back(a[i].second);
            ++i;
            --v;
        }
    } 

    // std::cout << "======\n";

    return true;
}

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 = n;
    std::vector<std::vector<int>> answer;
    // (l, r]
    while (l + 1 < r) {
        answer = std::vector<std::vector<int>>(n + 1, std::vector<int>());
        int m = (l + r) / 2;
        //std::cout << m << ' ' << run(a, d, m, answer) << '\n';
        if (run(a, d, m, answer)) {
            r = m;
        } else {
            l = m;
        }
    }

    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:9:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for (int i = 0; i < a.size(); ++i) {
      |                     ~~^~~~~~~~~~
jobs.cpp:16:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for (int j = 1; i < a.size() && j < answer.size(); ++j) {
      |                     ~~^~~~~~~~~~
jobs.cpp:16:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for (int j = 1; i < a.size() && j < answer.size(); ++j) {
      |                                     ~~^~~~~~~~~~~~~~~
jobs.cpp:24:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         while (i < a.size() && v > 0 && j >= a[i].first && j <= a[i].first + d) {
      |                ~~^~~~~~~~~~

• Subtask 1: 60 / 100