Submission #388069

#	Time	Username	Problem	Language	Result	Execution time	Memory
388069		timmyfeng	청소 (JOI20_sweeping)	C++17	0 / 100	253 ms	20396 KiB

sweeping

#include <bits/stdc++.h>
using namespace std;

const int N = 1000001;

#include <bits/extc++.h>

template <class T, class Comp = less<T>>
using ordered_set = __gnu_pbds::tree<
    T, __gnu_pbds::null_type, Comp,
    __gnu_pbds::rb_tree_tag,
    __gnu_pbds::tree_order_statistics_node_update
>;

int head[2][N], tail[2][N], prv[2][N], nxt[2][N];
int x_min[N], y_min[N], group[N], indices[N];
array<int, 2> point[N];

bool split(int i, int j, int l, int d) {
    bool flip = false;

    if (head[d][j] == 0) {
        head[d][i] = tail[d][i] = 0;
    } else {
        int h = head[d][j], t = tail[d][j];
        while (point[h][d] <= l && point[t][d] > l) {
            h = nxt[d][h], t = prv[d][t];
        }

        if (point[h][d] > l) {
            head[d][i] = h == head[d][j] ? 0 : head[d][j];
            tail[d][i] = prv[d][h];
            head[d][j] = h;

            nxt[d][prv[d][h]] = 0;
            prv[d][h] = 0;
        } else {
            flip = true;

            tail[d][i] = t == tail[d][j] ? 0 : tail[d][j];
            head[d][i] = nxt[d][t];
            tail[d][j] = t;

            prv[d][nxt[d][t]] = 0;
            nxt[d][t] = 0;
        }
    }

    d = 1 - d;

    int k = 0;
    for (int u = head[1 - d][i]; u != 0; u = nxt[1 - d][u]) {
        indices[k++] = u;
        group[u] = i;

        if (prv[d][u] == 0) {
            head[d][j] = nxt[d][u];
        }

        if (nxt[d][u] == 0) {
            tail[d][j] = prv[d][u];
        }

        nxt[d][prv[d][u]] = nxt[d][u];
        prv[d][nxt[d][u]] = prv[d][u];
    }

    if (k == 0) {
        head[d][i] = tail[d][i] = 0;
    } else {
        sort(indices, indices + k, [&](int u, int v) {
            return point[u][d] < point[v][d];
        });

        prv[d][indices[0]] = 0;
        head[d][i] = indices[0];
        nxt[d][indices[k - 1]] = 0;
        tail[d][i] = indices[k - 1];

        for (int i = 1; i < k; ++i) {
            nxt[d][indices[i - 1]] = indices[i];
            prv[d][indices[i]] = indices[i - 1];
        }
    }

    return flip;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m, q;
    cin >> n >> m >> q;

    for (int i = 1; i <= m; ++i) {
        for (auto &j : point[i]) {
            cin >> j;
        }
    }

    iota(indices, indices + m, 1);
    for (int d = 0; d < 2; ++d) {
        sort(indices, indices + m, [&](int u, int v) {
            return point[u][d] < point[v][d];
        });

        for (int i = 1; i < n; ++i) {
            nxt[d][indices[i - 1]] = indices[i];
            prv[d][indices[i]] = indices[i - 1];
        }

        head[d][0] = indices[0];
        tail[d][0] = indices[m - 1];
    }

    map<int, int> triangles = {{0, 0}};

    for (int i = 1; i <= q; ++i) {
        int type;
        cin >> type;

        if (type == 1) {
            int p;
            cin >> p;

            int j = group[p];
            cout << max(x_min[j], point[p][0]) << " " << max(y_min[j], point[p][1]) << "\n";
        } else if (type == 2) {
            int l;
            cin >> l;

            if (triangles.count(n - l) == 0) {
                int j = (--triangles.upper_bound(n - l))->second;
                x_min[i] = n - l, y_min[i] = y_min[j], y_min[j] = l + 1;
                triangles[n - l] = i;

                if (split(i, j, l, 1)) {
                    swap(x_min[j], x_min[i]), swap(y_min[j], y_min[i]);
                    swap(triangles[x_min[j]], triangles[x_min[i]]);
                }
            }
        } else if (type == 3) {
            int l;
            cin >> l;

            if (triangles.count(l + 1) == 0) {
                int j = (--triangles.upper_bound(l + 1))->second;
                y_min[i] = y_min[j], x_min[i] = l + 1, y_min[j] = n - l;
                triangles[l + 1] = i;

                if (!split(i, j, l, 0)) {
                    swap(x_min[j], x_min[i]), swap(y_min[j], y_min[i]);
                    swap(triangles[x_min[j]], triangles[x_min[i]]);
                }
            }
        } else if (type == 4) {
            int a, b;
            cin >> a >> b;
            assert(false);
        }
    }
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 10
• Subtask 3: 0 / 11
• Subtask 4: 0 / 53
• Subtask 5: 0 / 25