Submission #791517

#	Time	Username	Problem	Language	Result	Execution time	Memory
791517		t6twotwo	Prize (CEOI22_prize)	C++17	0 / 100	2059 ms	245296 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N, K, Q, T;
    cin >> N >> K >> Q >> T;
    vector<int> p(N);
    for (int &x : p) {
        cin >> x;
    }
    vector<vector<int>> adj(N);
    int root = -1;
    for (int i = 0; i < N; i++) {
        cin >> p[i];
        if (p[i] == -1) {
            root = i;
        } else {
            p[i]--;
            adj[p[i]].push_back(i);
        }
    }
    vector<int> ch;
    auto choose = [&](auto f, int x) -> void {
        if (ch.size() < K) {
            ch.push_back(x);
        }
        for (int y : adj[x]) {
            f(f, y);
        }
    };
    assert(root != -1);
    choose(choose, root);
    assert(ch.size() == K);
    for (int x : ch) {
        cout << x + 1 << " ";
    }
    cout << endl;
    vector<ll> w(N);
    for (int x : ch) {
        if (x != root) {
            cout << "? " << p[x] + 1 << " " << x + 1 << endl;
        }
    }
    cout << "!" << endl;
    for (int x : ch) {
        if (x != root) {
            cin >> w[x] >> w[x] >> w[x] >> w[x];
        }
    }
    vector<int> dep(N);
    vector par(N, vector<int>(19, -1));
    auto dfs = [&](auto dfs, int x) -> void {
        for (int i = 0; i < 18 && par[x][i] != -1; i++) {
            par[x][i + 1] = par[par[x][i]][i];
        }
        for (int y : adj[x]) {
            w[y] += w[x];
            par[y][0] = x;
            dep[y] = dep[x] + 1;
            dfs(dfs, y);
        }
    };
    dfs(dfs, root);
    auto lca = [&](int x, int y) {
        if (dep[x] < dep[y]) {
            swap(x, y);
        }
        for (int i = 0; i < 19; i++) {
            if ((dep[x] - dep[y]) >> i & 1) {
                x = par[x][i];
            }
        }
        if (x == y) {
            return x;
        }
        for (int i = 18; i >= 0; i--) {
            if (par[x][i] != par[y][i]) {
                x = par[x][i];
                y = par[y][i];
            }
        }
        return par[x][0];
    };
    for (int i = 0; i < T; i++) {
        int x, y;
        cin >> x >> y;
        x--, y--;
        cout << w[x] + w[y] - 2 * w[lca(x, y)] << endl;
    }
    return 6/22;
}

Compilation message (stderr)

In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from Main.cpp:1:
Main.cpp: In function 'int main()':
Main.cpp:35:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   35 |     assert(ch.size() == K);
      |            ~~~~~~~~~~^~~~
Main.cpp: In instantiation of 'main()::<lambda(auto:23, int)> [with auto:23 = main()::<lambda(auto:23, int)>]':
Main.cpp:34:24:   required from here
Main.cpp:26:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   26 |         if (ch.size() < K) {
      |             ~~~~~~~~~~^~~

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