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Submission #784456

# Submission time Handle Problem Language Result Execution time Memory
784456 2023-07-16T06:50:32 Z t6twotwo Spring cleaning (CEOI20_cleaning) C++17
100 / 100
 203 ms 25664 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N, Q;
    cin >> N >> Q;
    vector<int> deg(N);
    vector<vector<int>> adj(N);
    for (int i = 0; i < N - 1; i++) {
        int x, y;
        cin >> x >> y;
        deg[--x]++;
        deg[--y]++;
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    vector<int> v(N), par(N, -1), dep(N), sz(N);
    int cnt = 0, leaves = 0;
    auto init = [&](auto init, int x) -> void {
        if (deg[x] == 1) {
            v[x] = 1;
            leaves++;
        }
        if (par[x] != -1) {
            adj[x].erase(find(adj[x].begin(), adj[x].end(), par[x]));
        }
        sz[x] = 1;
        for (int &y : adj[x]) {
            par[y] = x;
            dep[y] = dep[x] + 1;
            init(init, y);
            sz[x] += sz[y];
            v[x] ^= v[y];
            if (sz[y] > sz[adj[x][0]]) {
                swap(y, adj[x][0]);
            }
        }
        cnt += v[x];
    };
    init(init, 0);
    int K = 2 << __lg(N - 1);
    vector<int> top(N), in(N), lazy(2 * K), s(2 * K), t(2 * K);
    int timer = 0;
    auto dfs = [&](auto dfs, int x) -> void {
        in[x] = timer++;
        s[in[x] + K] = v[x];
        t[in[x] + K] = 1;
        for (int y : adj[x]) {
            top[y] = y == adj[x][0] ? top[x] : y;
            dfs(dfs, y);
        }
    };
    dfs(dfs, 0);
    auto apply = [&](int p, int z) {
        if (z) {
            s[p] = t[p] - s[p];
            lazy[p] ^= 1;
        }
    };
    auto pull = [&](int p) {
        s[p] = s[p * 2] + s[p * 2 + 1];
    };
    auto push = [&](int p) {
        apply(p * 2, lazy[p]);
        apply(p * 2 + 1, lazy[p]);
        lazy[p] = 0;
    };
    auto update = [&](auto f, int p, int l, int r, int L, int R) -> void {
        if (R <= l || r <= L) {
            return;
        }
        if (L <= l && r <= R) {
            apply(p, 1);
            return;
        }
        int m = (l + r) / 2;
        push(p);
        f(f, p * 2, l, m, L, R);
        f(f, p * 2 + 1, m, r, L, R);
        pull(p);
    };
    for (int i = K - 1; i; i--) {
        pull(i);
        t[i] = t[i * 2] + t[i * 2 + 1];
    }
    while (Q--) {
        int D;
        cin >> D;
        vector<int> a(D);
        for (int &p : a) {
            cin >> p;
            p--;
            if (deg[p]++ != 1) {
                leaves++;
                int x = p;
                while (x != -1) {
                    update(update, 1, 0, K, in[top[x]], in[x] + 1);
                    x = par[top[x]];
                }
            }
        }
        if (leaves % 2 == 1) {
            cout << -1 << "\n";
        } else {
            cout << 2 * (N - 1) - s[1] + D << "\n";
        }
        for (int p : a) {
            if (--deg[p] != 1) {
                leaves--;
                int x = p;
                while (x != -1) {
                    update(update, 1, 0, K, in[top[x]], in[x] + 1);
                    x = par[top[x]];
                }
            }
        }
    }
    return 6/22;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 90 ms 2972 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 1108 KB Output is correct
2 Correct 45 ms 1108 KB Output is correct
3 Correct 32 ms 12224 KB Output is correct
4 Correct 65 ms 10032 KB Output is correct
5 Correct 64 ms 12600 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 2004 KB Output is correct
2 Correct 37 ms 2012 KB Output is correct
3 Correct 51 ms 25664 KB Output is correct
4 Correct 97 ms 24100 KB Output is correct
5 Correct 37 ms 23740 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 4200 KB Output is correct
2 Correct 41 ms 3028 KB Output is correct
3 Correct 7 ms 2892 KB Output is correct
4 Correct 8 ms 3832 KB Output is correct
5 Correct 9 ms 4308 KB Output is correct
6 Correct 45 ms 3828 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 113 ms 7756 KB Output is correct
2 Correct 203 ms 7452 KB Output is correct
3 Correct 150 ms 3960 KB Output is correct
4 Correct 182 ms 7372 KB Output is correct
5 Correct 182 ms 7392 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 172 ms 12408 KB Output is correct
2 Correct 97 ms 17404 KB Output is correct
3 Correct 138 ms 16164 KB Output is correct
4 Correct 116 ms 18312 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 90 ms 2972 KB Output is correct
3 Correct 45 ms 1108 KB Output is correct
4 Correct 45 ms 1108 KB Output is correct
5 Correct 32 ms 12224 KB Output is correct
6 Correct 65 ms 10032 KB Output is correct
7 Correct 64 ms 12600 KB Output is correct
8 Correct 37 ms 2004 KB Output is correct
9 Correct 37 ms 2012 KB Output is correct
10 Correct 51 ms 25664 KB Output is correct
11 Correct 97 ms 24100 KB Output is correct
12 Correct 37 ms 23740 KB Output is correct
13 Correct 64 ms 4200 KB Output is correct
14 Correct 41 ms 3028 KB Output is correct
15 Correct 7 ms 2892 KB Output is correct
16 Correct 8 ms 3832 KB Output is correct
17 Correct 9 ms 4308 KB Output is correct
18 Correct 45 ms 3828 KB Output is correct
19 Correct 113 ms 7756 KB Output is correct
20 Correct 203 ms 7452 KB Output is correct
21 Correct 150 ms 3960 KB Output is correct
22 Correct 182 ms 7372 KB Output is correct
23 Correct 182 ms 7392 KB Output is correct
24 Correct 172 ms 12408 KB Output is correct
25 Correct 97 ms 17404 KB Output is correct
26 Correct 138 ms 16164 KB Output is correct
27 Correct 116 ms 18312 KB Output is correct
28 Correct 123 ms 7148 KB Output is correct
29 Correct 116 ms 16672 KB Output is correct
30 Correct 57 ms 12632 KB Output is correct
31 Correct 96 ms 24004 KB Output is correct
32 Correct 199 ms 7580 KB Output is correct
33 Correct 125 ms 14736 KB Output is correct
34 Correct 119 ms 17612 KB Output is correct
35 Correct 132 ms 17496 KB Output is correct