oj.uz

Submission #578193

# Submission time Handle Problem Language Result Execution time Memory
578193 2022-06-16T07:36:37 Z tengiz05 Spring cleaning (CEOI20_cleaning) C++17
35 / 100
 110 ms 19468 KB 
#include <bits/stdc++.h>

using namespace std;
using i64 = long long;

struct SegmentTree {
    int n;
    vector<int> t;
    SegmentTree(int n) : n(n), t(2 * n) {}
    int get(int l, int r) {
        int res = 0;
        for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
            if (l & 1)
                res ^= t[l++];
            if (r & 1)
                res ^= t[--r];
        }
        return res;
    }
    void update(int x) {
        for (x += n; x > 0; x >>= 1) {
            t[x] ^= 1;
        }
    }
};
/*

7 3
1 2
2 4
4 5
5 6
5 7
3 4
1 4
2 2 4
5 6 6 5 4 2

*/
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n, q;
    cin >> n >> q;
    
    vector<vector<int>> e(n);
    vector<int> deg(n);
    
    for (int i = 0; i < n - 1; i++) {
        int u, v;
        cin >> u >> v;
        u--;
        v--;
        e[u].push_back(v);
        e[v].push_back(u);
        deg[u]++;
        deg[v]++;
    }
    
    vector<int> c(n), in(n), out(n);
    vector s(2, vector<int>(n));
    
    int timeStamp = 0;
    int cnt = 0;
    
    function<void(int, int)> dfs = [&](int u, int p) {
        in[u] = timeStamp++;
        c[u] = deg[u] <= 1;
        cnt += c[u];
        for (int v : e[u]) {
            if (v != p) {
                dfs(v, u);
                c[u] ^= c[v];
            }
        }
        out[u] = timeStamp;
    };
    
    dfs(0, -1);
    
    int f[2] {};
    
    dfs = [&](int u, int p) {
        if (p != -1) {
            s[1][u] += c[u];
            s[0][u] += !c[u];
            f[c[u]]++;
        }
        for (int v : e[u]) {
            if (v != p) {
                s[1][v] = s[1][u];
                s[0][v] = s[0][u];
                dfs(v, u);
            }
        }
    };
    
    dfs(0, -1);
    
    SegmentTree t(n);
    
    while (q--) {
        int k;
        cin >> k;
        
        vector<int> d(k);
        for (int i = 0; i < k; i++) {
            cin >> d[i];
            d[i]--;
        }
        
        set<int> v(d.begin(), d.end());
        int leaves = cnt + k;
        for (int x : v) {
            if (deg[x] <= 1) {
                leaves--;
            }
        }
        
        if (leaves % 2 != 0) {
            cout << "-1\n";
            continue;
        }
        
        int a[2] {f[0], f[1]};
        
        sort(d.begin(), d.end(), [&](int i, int j) {
            return in[i] > in[j];
        });
        for (int u : d) {
            if (deg[u] > 1) {
                int x = t.get(in[u], out[u]);
                a[1] -= s[1 ^ x][u];
                a[1] += s[0 ^ x][u];
                a[0] -= s[0 ^ x][u];
                a[0] += s[1 ^ x][u];
                t.update(in[u]);
            }
            deg[u]++;
        }
        
        int ans = 2 * a[0] + a[1] + k;
        cout << ans << "\n";
        
        reverse(d.begin(), d.end());
        for (int u : d) {
            deg[u]--;
            if (deg[u] > 1) {
                t.update(in[u]);
            }
        }
    }
    
    return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 40 ms 2296 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 980 KB Output is correct
2 Correct 12 ms 936 KB Output is correct
3 Correct 41 ms 9464 KB Output is correct
4 Correct 58 ms 9304 KB Output is correct
5 Correct 70 ms 12348 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 1696 KB Output is correct
2 Correct 13 ms 1688 KB Output is correct
3 Correct 52 ms 18132 KB Output is correct
4 Correct 88 ms 19468 KB Output is correct
5 Correct 43 ms 16504 KB Output is correct

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Incorrect 30 ms 2900 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 6372 KB Output is correct
2 Incorrect 57 ms 6088 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 95 ms 9512 KB Output is correct
2 Correct 88 ms 12740 KB Output is correct
3 Correct 110 ms 12000 KB Output is correct
4 Correct 89 ms 13348 KB Output is correct

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 40 ms 2296 KB Output isn't correct
3 Halted 0 ms 0 KB -