Submission #691767

#	Time	Username	Problem	Language	Result	Execution time	Memory
691767		piOOE	Prize (CEOI22_prize)	C++17	10 / 100	2619 ms	434524 KiB

Main

#include <bits/stdc++.h>

using namespace std;

void massert(bool f) {
    while (!f) {
        cout << "hell nah" << endl;
    }
}

struct Tree {
    vector<int> tin, tout, par;
    vector<vector<int>> jump;
    int logn;

    void init(vector<vector<int>> adj, int root) {
        int n = adj.size();
        tin.resize(n), tout.resize(n), par.assign(n, -1);
        int T = 0;

        function<void(int)> dfs = [&](int v) {
            tin[v] = T++;
            for (int to : adj[v]) {
                assert(par[to] == -1);
                par[to] = v;
                dfs(to);
            }
            tout[v] = T;
        };

        dfs(root);

        par[root] = root;

        logn = __lg(n) + 1;

        jump = vector(logn, vector<int>(n));
        jump[0] = par;

        for (int j = 1; j < logn; ++j) {
            for (int i = 0; i < n; ++i) {
                jump[j][i] = jump[j - 1][jump[j - 1][i]];
            }
        }
    }

    bool isp(int a, int b) {
        return tin[a] <= tin[b] && tout[a] >= tout[b];
    }

    int lca(int a, int b) {
        if (isp(a, b)) {
            return a;
        }

        for (int i = logn - 1; i >= 0; --i) {
            if (!isp(jump[i][a], b)) {
                a = jump[i][a];
            }
        }

        return jump[0][a];
    }
} t1, t2;

vector<int> normalize(int n, int root, vector<vector<pair<int, int>>> g) {
    vector<int> dist(n, -1);
    dist[root] = 0;

    function<void(int)> dfs = [&](int v) {
        for (auto [to, w] : g[v]) {
            if (dist[to] == -1) {
                dist[to] = dist[v] + w;
                assert(dist[to] != -1);
                dfs(to);
            }
        }
    };

    dfs(root);

    return dist;
}

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

    int n, k, q, t;
    cin >> n >> k >> q >> t;

    vector<int> p1(n), p2(n);

    for (int i = 0; i < n; ++i) {
        cin >> p1[i];
        p1[i] = max(-1, p1[i] - 1);
    }

    for (int i = 0; i < n; ++i) {
        cin >> p2[i];
        p2[i] = max(-1, p2[i] - 1);
    }

    for (int i = 1; i <= k; ++i) {
        cout << i << " ";
    }
    cout << endl;

    int root1 = find(p1.begin(), p1.end(), -1) - p1.begin();
    int root2 = find(p2.begin(), p2.end(), -1) - p2.begin();

    vector<vector<int>> adj(n);

    for (int i = 0; i < n; ++i) {
        if (p1[i] != -1) {
            adj[p1[i]].push_back(i);
        }
    }

    t1.init(adj, root1);

    for (int i = 0; i < n; ++i) {
        adj[i].clear();
    }

    for (int i = 0; i < n; ++i) {
        if (p2[i] != -1) {
            adj[p2[i]].push_back(i);
        }
    }

    t2.init(adj, root2);

    vector<pair<int, int>> questions;

    vector<int> any(n, -1);

    function<void(int)> dfs = [&](int v) {
        if (v < k) {
            any[v] = v;
        }

        vector<int> alive;

        for (int to : adj[v]) {
            dfs(to);

            if (any[to] != -1) {
                alive.push_back(to);
            }
        }

        if (alive.empty()) {
            return;
        }

        any[v] = any[alive[0]];

        if (alive.size() == 1) {
            if (v < k) {
                questions.emplace_back(any[alive[0]], v);
            }
        } else {
            for (int i = 1; i < alive.size(); ++i) {
                questions.emplace_back(any[alive[0]], any[alive[i]]);
            }
        }
    };

    dfs(root2);

    for (auto [x, y] : questions) {
        cout << "? " << x + 1 << " " << y + 1 << endl;
    }
    cout << "!" << endl;

    vector<vector<pair<int, int>>> g1(n), g2(n);

    int h1 = -1, h2 = -1;

    auto addEdge = [&](int t, int x, int y, int w) {
        (t == 0 ? g1[x] : g2[x]).emplace_back(y, w);
        (t == 0 ? g1[y] : g2[y]).emplace_back(x, -w);
    };

    for (auto [x, y] : questions) {
        int a, b, c, d;
        cin >> a >> b >> c >> d;

        int c1 = t1.lca(x, y);
        int c2 = t2.lca(x, y);

        if (h1 == -1 || t1.isp(c1, h1)) {
            h1 = c1;
        }
        if (h2 == -1 || t2.isp(c2, h2)) {
            h2 = c2;
        }

        addEdge(0, c1, x, a);
        addEdge(0, c1, y, b);
        addEdge(1, c2, x, c);
        addEdge(1, c2, y, d);
    }

    auto first = normalize(n, h1, g1);
    auto second = normalize(n, h2, g2);

    vector<pair<int, int>> queries(t);
    for (auto &[a, b] : queries) {
        cin >> a >> b;
        a -= 1, b -= 1;
    }
    
    for (auto [a, b] : queries) {
        int dist1 = first[a] + first[b] - 2 * first[t1.lca(a, b)];
        int dist2 = second[a] + second[b] - 2 * second[t2.lca(a, b)];

        cout << dist1 << " " << dist2 << '\n';
    }

    return 0;
}

Compilation message (stderr)

Main.cpp: In lambda function:
Main.cpp:164:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  164 |             for (int i = 1; i < alive.size(); ++i) {
      |                             ~~^~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 25
• Subtask 3: 0 / 19
• Subtask 4: 0 / 22
• Subtask 5: 0 / 24