Submission #419309

#	Time	Username	Problem	Language	Result	Execution time	Memory
419309		2qbingxuan	Cultivation (JOI17_cultivation)	C++17	0 / 100	245 ms	332 KiB

cultivation

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#ifdef local
#define safe cerr<<__PRETTY_FUNCTION__<<" line "<<__LINE__<<" safe\n"
#define pary(a...) danb(#a, a)
#define debug(a...) qqbx(#a, a)
template <typename ...T> void qqbx(const char *s, T ...a) {
    int cnt = sizeof...(T);
    ((std::cerr << "\033[1;32m(" << s << ") = (") , ... , (std::cerr << a << (--cnt ? ", " : ")\033[0m\n")));
}
template <typename T> void danb(const char *s, T L, T R) {
    std::cerr << "\033[1;32m[ " << s << " ] = [ ";
    for (int f = 0; L != R; ++L)
        std::cerr << (f++ ? ", " : "") << *L;
    std::cerr << " ]\033[0m\n";
}
#else
#define debug(...) ((void)0)
#define safe ((void)0)
#define pary(...) ((void)0)
#endif // local
#define all(v) begin(v),end(v)
#define pb emplace_back
#define get_pos(u,x) int(lower_bound(all(u),x)-begin(u))

using namespace std;
using ll = int_fast64_t;
using ld = long double;
template <typename T> using min_heap = priority_queue<T, vector<T>, greater<T>>;
const int mod = 1000000007;
const int inf = 1e9;
const ll INF = 1e18;
const int maxn = 5025;
template <typename T> void sort_uni(T &v) { sort(all(v)), v.erase(unique(all(v)), v.end()); }

signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0);
    int R, C, N;
    cin >> R >> C >> N;
    vector<pair<int,int>> pts(N);
    for (auto &[x, y]: pts) cin >> x >> y;

    auto solve = [&]() {
        sort(all(pts));

        vector<int> dx{0};
        for (int i = 0; i < N; i++) {
            for (int j = 0; j < i; j++) {
                dx.emplace_back(pts[i].first - pts[j].first - 1);
            }
            dx.emplace_back(pts[i].first - 1);
            dx.emplace_back(R - pts[i].first);
        }
        sort_uni(dx);

        int mina = pts[0].first - 1;
        int minb = R - pts[N-1].first;
        int minsum = 0;
        for (int i = 1; i < N; i++) minsum = max(minsum, pts[i].first - pts[i-1].first - 1);

        int res = 2e9;
        for (int a: dx) {
            if (a < mina) continue;
            for (int b: dx) {
                if (b < minb) continue;
                if (a + b < minsum) continue;
                vector<pair<int,int>> evt;
                for (auto [x, y]: pts) evt.emplace_back(x-a, y);
                for (auto [x, y]: pts) evt.emplace_back(x+b+1, -y);
                inplace_merge(evt.begin(), evt.begin() + N, evt.end());

                multiset<int> posy;
                multiset<int> diff;

                auto add = [&](int val) {
                    debug("ADD", val);
                    pary(all(posy));
                    pary(all(diff));
                    auto it = posy.insert(val);
                    if (it != posy.begin() && next(it) != posy.end())
                        diff.erase(diff.find(*next(it) - *prev(it)));
                    if (it != posy.begin())
                        diff.insert(val - *prev(it));
                    if (next(it) != posy.end())
                        diff.insert(*next(it) - val);
                    debug("ADD - finish", val);
                    pary(all(posy));
                    pary(all(diff));
                };
                auto remove = [&](int val) {
                    debug("REM", val);
                    pary(all(posy));
                    pary(all(diff));
                    auto it = posy.find(val);
                    if (it != posy.begin())
                        diff.erase(diff.find(val - *prev(it)));
                    if (next(it) != posy.end())
                        diff.erase(diff.find(*next(it) - val));
                    if (it != posy.begin() && next(it) != posy.end())
                        diff.insert(*next(it) - *prev(it));
                    posy.erase(it);
                    debug("REM - finish", val);
                    pary(all(posy));
                    pary(all(diff));
                };
                int ans = 0;
                for (int i = 0, j = 0; i < N*2; i = j) {
                    for (j = i; j < N*2; j++) {
                        if (evt[j].first != evt[i].first) break;
                        int y = evt[j].second;
                        if (y < 0) {
                            remove(-y);
                        } else {
                            add(y);
                        }
                    }
                    if (j == N*2) continue;
                    int l = evt[i].first;
                    int r = evt[j].first;
                    if (r <= 1 || l > R) continue;
                    assert (posy.size() > 0);
                    ans = max(ans, (*posy.begin() - 1) + (C - *prev(posy.end())));
                    if (diff.size())
                        ans = max(ans, *prev(diff.end()) - 1);
                }
                debug(a, b, ans);
                res = min(res, a + b + ans);
            }
        }
        return res;
    };
    int res = solve();
    for (auto &[x, y]: pts) swap(x, y);
    cout << min(res, solve()) << '\n';
}

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