Submission #1109175

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109175		juliany2	Cultivation (JOI17_cultivation)	C++17	5 / 100	1 ms	504 KiB

cultivation

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) (x).begin(), (x).end()

const int N = 307;
int n, m;
int k;
array<int, 2> a[N];
vector<int> b[N];
array<int, 3> c[N];

int main() {
    cin.tie(0)->sync_with_stdio(false);

    cin >> n >> m >> k;

    vector<int> v;
    for (int i = 1; i <= k; i++) {
        cin >> a[i][0] >> a[i][1];
        v.push_back(a[i][0]);
    }

    sort(all(v));
    v.erase(unique(all(v)), v.end());

    int l = v.size();

    auto get = [&](int x) {
        return lower_bound(all(v), x) - v.begin();
    };

    for (int i = 1; i <= k; i++) {
        b[get(a[i][0])].push_back(a[i][1]);
    }

    for (int i = 0; i < l; i++) {
        sort(all(b[i]));

        c[i][0] = b[i].front() - 1;
        c[i][1] = m - b[i].back();

        for (int j = 1; j < b[i].size(); j++) {
            c[i][2] = max(c[i][2], b[i][j] - b[i][j - 1] - 1);
        }
    }

    ll ans = 1e18;
    auto check = [&](int p, int q) {
        vector<int> d;
        for (int i = 0; i < l; i++) {
            if (p >= c[i][0] && q >= c[i][1] && p + q >= c[i][2]) {
                d.push_back(v[i]);
            }
        }

        if (d.empty())
            return;

        int s = d.front() - 1, t = n - d.back(), gap = 0;
        for (int i = 1; i < d.size(); i++) {
            gap = max(gap, d[i] - d[i - 1] - 1);
        }

        ans = min(ans, 0LL + p + q + max(s + t, gap));
    };

    for (int i = 0; i < l; i++) {
        for (int j = 0; j < l; j++) {
            check(c[i][0], c[j][1]);
            if (c[j][2] >= c[i][0])
                check(c[i][0], c[j][2] - c[i][0]);
        }
    }

    for (int i = 0; i < 50; i++)
        for (int j = 0; j < 50; j++)
            check(i, j);

    cout << ans << '\n';

    return 0;
}

Compilation message (stderr)

cultivation.cpp: In function 'int main()':
cultivation.cpp:43:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         for (int j = 1; j < b[i].size(); j++) {
      |                         ~~^~~~~~~~~~~~~
cultivation.cpp: In lambda function:
cultivation.cpp:61:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |         for (int i = 1; i < d.size(); i++) {
      |                         ~~^~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20
• Subtask 6: 0 / 20