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제출 #810339

#제출 시각아이디문제언어결과실행 시간메모리
810339model_codeGarden (JOI23_garden)C++17
100 / 100
591 ms8228 KiB
// O(N + M + D^2) #include<bits/stdc++.h> using namespace std; // N 個の要素が円環状に並んでいて,最初すべて off // on(i) : 要素 i を on にする // get() : on である要素が連続する部分の長さの最大値を返す struct S { int n, mx; vector<bool> is_on; vector<int> l, r; S(int n) : n(n), mx(0), is_on(n), l(n), r(n) {} void on(int i) { is_on[i] = true; int pre = (i ? i - 1 : n - 1); int nx = (i < n - 1 ? i + 1 : 0); int nl = (is_on[pre] ? l[pre] : i); int nr = (is_on[nx] ? r[nx] : i); if (n == 1 or nl == nx) { mx = n; return; } mx = max(mx, (nr - nl + n) % n + 1); r[nl] = nr; l[nr] = nl; } int get() { return mx; } }; int main() { int n, m, d; cin >> n >> m >> d; // トーラス状になった D x D 領域の上で考える vector<bool> x_must(d), y_must(d); // 各 x, y 座標が必ず庭に含まれるかどうか for (int i = 0; i < n; i++) { int p, q; cin >> p >> q; x_must[p] = true; y_must[q] = true; } vector <vector<int>> rq(d); // rq[i] : x = i が庭に含まれない場合,含まなければならなくなる y 座標のリスト for (int i = 0; i < m; i++) { int r, s; cin >> r >> s; if (x_must[r] or y_must[s]) continue; rq[r].push_back(s); } for(int i = 0; i < d; i++) x_must.push_back(x_must[i]); for(int i = 0; i < d; i++) rq.push_back(rq[i]); int ans = d * d; vector <vector<int>> last_ls(2 * d); for (int L = 1; L <= d; L++) { if (!x_must[L - 1]) continue; int R = L; while (!x_must[R]) ++R; vector<int> last(d, -1); // 選ばない x の範囲を全探索 for (int l = R; l >= L; l--) { if (l < R) { for (int i: rq[l]) last[i] = l; } for (int i = l; i < R; i++) last_ls[i].clear(); for (int i = 0; i < d; i++) { if (last[i] != -1) last_ls[last[i]].push_back(i); } S s(d); for (int i = 0; i < d; i++) if (!y_must[i] and last[i] == -1) s.on(i); for (int r = R; r >= l; r--) { if (r < R) { for (int i: last_ls[r]) s.on(i); } ans = min(ans, (d - (r - l)) * (d - s.get())); } } L = R; } cout << ans << endl; }
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