Submission #905044

#	Time	Username	Problem	Language	Result	Execution time	Memory
905044		akliu	Job Scheduling (CEOI12_jobs)	C++11	100 / 100	870 ms	20164 KiB

jobs

#include <bits/stdc++.h>
 
using namespace std;
 
void fastio() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
}
 
void open(string filename) {
    fastio();
    freopen((filename + ".in").c_str(), "r", stdin);
    freopen((filename + ".out").c_str(), "w", stdout);
}
 
typedef long long ll;
#define vll vector<ll>
#define vint vector<int>
#define vbool vector<bool>
#define vpii vector<pii>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define mp make_pair
#define ins(x) insert(x)
#define sz() size()
#define lb() lower_bound()
#define ub() upper_bound()
#define rsz resize
#define se second
#define fi first
#define cont continue
 
// scary demonic thing
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

struct g {
    int day, n;
    bool operator<(const g &y) {
        if (day != y.day) return day < y.day;
        return n < y.n; // Not necessary, compiler gives annoying error otherwise though
    }
};
 
int N, D, M;
vector<g> v;
 
bool check(int m) {
    // Iterate to check if the minimum is valid
    multiset<int> machines;
    deque<int> q;
    int d = 0;
    auto it = v.begin();
    g val = *it;
    while (d != N + 1) {
        if (q.sz()) {
            if (d - *(q.begin()) > D) {
                return false;
            }
        }
        machines.clear();
        val = *it;
        while (machines.sz() != m) {
            if (!q.sz()) break;
            machines.ins(*(q.begin()));
            q.pop_front();
        }
        while (val.day == d) {
            if (machines.sz() != m) machines.ins(val.day);
            else q.push_back(val.day);
            ++it;
            if (it == v.end()) break;
            val = *it;
        }
        ++d;
    }
    return true;
}
 
void solve() {
    // Input
    cin >> N >> D >> M;
    for (int i = 0; i < M; ++i) {
        int a; cin >> a;
        v.pb({a, i + 1});
    }
    sort(v.begin(), v.end());
 
    // Binary search
    int l = 1, r = 1e6, m;
    while (l < r) {
        m = (l + r) / 2;
        if (check(m)) r = m;
        else l = m + 1;
    }
    cout << l << "\n";
 
    // Iterate once more with the correct minimum, very minor changes to the binary search algorithm to allow for storing the index of the value
    vector<vint> ans(N + 1);
    multiset<pii> machines;
    deque<pii> q;
    int d = 0;
    auto it = v.begin();
    g val = *it;
    while (d != N + 1) {
        machines.clear();
        val = *it;
        while (machines.sz() != l) {
            if (!q.sz()) break;
            pii valQ = *(q.begin());
            machines.ins(mp(valQ.fi, valQ.se));
            q.pop_front();
        }
        while (val.day == d) {
            val = *it;
            if (machines.sz() != l) {
                machines.ins(mp(val.day, val.n));
            }
            else q.push_back(mp(val.day, val.n));
            ++it;
            if (it == v.end()) break;
        }
        for (auto &x : machines) {
            ans[d].pb(x.se);
        }
        ++d;
    }
 
    // Output
    for (int i = 1; i <= N; ++i) {
        for (int j = 0; j < ans[i].sz(); ++j) {
            cout << ans[i][j] << " ";
        }
        cout << "0\n";
    }
}
 
int main() {
    fastio();
    int tc = 1;
    // cin >> tc;
    while (tc--) {
        solve();
    }
 
    return 0;
}

Compilation message (stderr)

jobs.cpp: In function 'bool check(int)':
jobs.cpp:64:30: warning: comparison of integer expressions of different signedness: 'std::multiset<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   64 |         while (machines.sz() != m) {
      |                ~~~~~~~~~~~~~~^~~~
jobs.cpp:70:31: warning: comparison of integer expressions of different signedness: 'std::multiset<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   70 |             if (machines.sz() != m) machines.ins(val.day);
      |                 ~~~~~~~~~~~~~~^~~~
jobs.cpp: In function 'void solve()':
jobs.cpp:109:30: warning: comparison of integer expressions of different signedness: 'std::multiset<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  109 |         while (machines.sz() != l) {
      |                ~~~~~~~~~~~~~~^~~~
jobs.cpp:117:31: warning: comparison of integer expressions of different signedness: 'std::multiset<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  117 |             if (machines.sz() != l) {
      |                 ~~~~~~~~~~~~~~^~~~
jobs.cpp:132:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  132 |         for (int j = 0; j < ans[i].sz(); ++j) {
      |                           ^
jobs.cpp: In function 'void open(std::string)':
jobs.cpp:12:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     freopen((filename + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jobs.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen((filename + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100