oj.uz

답안 #574436

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
574436 2022-06-08T14:54:59 Z piOOE Spring cleaning (CEOI20_cleaning) C++17
25 / 100
 1000 ms 22704 KB 
#include <bits/stdc++.h>

using namespace std;

#define sz(x) ((int)size(x))
#define all(x) begin(x), end(x)
#define trace(x) cout << #x << ": " << (x) << endl;

typedef long long ll;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

int rand(int l, int r) { return (int) ((ll) rnd() % (r - l + 1)) + l; }

const int N = 200000, infI = 1e9 + 7;
const ll infL = 3e18;

vector<int> g[N];
ll dp[3][N];//LL???
int depth[N], parent[N];

void pull(int v) {
    dp[0][v] = 0;
    dp[1][v] = dp[2][v] = infL;
    if (sz(g[v]) <= 1) {
        //v is a leaf
        dp[1][v] = 1;
    } else {
        for (int to: g[v]) {
            if (to != parent[v]) {
                array<ll, 3> dq = {dp[0][v], dp[1][v], dp[2][v]};
                dp[0][v] = min({dq[2] + dp[2][to], dq[1] + dp[1][to]});
                dp[1][v] = min({dq[0] + dp[1][to], dq[2] + dp[1][to], dq[1] + dp[2][to]});
                dp[2][v] = min({dq[0] + dp[2][to], dq[2] + dp[2][to], dq[1] + dp[1][to]});
            }
        }
        dp[1][v] += 1;
        dp[2][v] += 2;
    }
}

void dfs(int v, int p) {
    if (p != -1) {
        depth[v] = depth[p] + 1;
    }
    parent[v] = p;
    dp[0][v] = 0;
    dp[1][v] = dp[2][v] = infL;
    if (sz(g[v]) <= 1) {
        //v is a leaf
        dp[1][v] = 1;
    } else {
        for (int to: g[v]) {
            if (to != p) {
                dfs(to, v);
                array<ll, 3> dq = {dp[0][v], dp[1][v], dp[2][v]};
                dp[0][v] = min({dq[2] + dp[2][to], dq[1] + dp[1][to]});
                dp[1][v] = min({dq[0] + dp[1][to], dq[2] + dp[1][to], dq[1] + dp[2][to]});
                dp[2][v] = min({dq[0] + dp[2][to], dq[2] + dp[2][to], dq[1] + dp[1][to]});
            }
        }
        dp[1][v] += 1;
        dp[2][v] += 2;
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, q;
    cin >> n >> q;
    int root = -1;
    for (int i = 0; i < n - 1; ++i) {
        int a, b;
        cin >> a >> b;
        --a, --b;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    for (int i = 0; i < n; ++i) {
        if (sz(g[i]) > 1) {
            root = i;
            break;
        }
    }
    assert(root != -1);
    dfs(root, -1);
    if (*max_element(all(depth)) <= 18) {
        while (q--) {
            int D;
            cin >> D;
            vector<int> a(D);
            for (int i = 0; i < D; ++i) {
                cin >> a[i];
                --a[i];
            }
            sort(all(a));
            vector<int> b;
            int extra = 0;
            for (int i = 0; i < D;) {
                int j = i;
                while (j < D && a[i] == a[j])
                    ++j;
                if ((j - i) & 1) {
                    b.push_back(a[i]);
                    extra += j - i - 1;
                } else {
                    b.push_back(a[i]);
                    b.push_back(a[i]);
                    extra += j - i - 2;
                }
                i = j;
            }
            swap(a, b);
            D = sz(a);
            for (int i = 0; i < D; ++i) {
                g[a[i]].push_back(i + n);
            }
            for (int i = 0; i < D; ++i) {
                dp[2][i + n] = infL;
                dp[1][i + n] = 1;
                if (i == 0 || a[i - 1] != a[i]) {
                    int x = a[i];
                    while (x != -1) {
                        pull(x);
                        x = parent[x];
                    }
                }
            }
            cout << (dp[0][root] >= infL ? -1 : dp[0][root] + extra) << '\n';
            for (int i = 0; i < D; ++i) {
                g[a[i]].pop_back();
                if (i == D - 1 || a[i + 1] != a[i]) {
                    int x = a[i];
                    while (x != -1) {
                        pull(x);
                        x = parent[x];
                    }
                }
            }
        }
    } else {
        while (q--) {
            int D;
            cin >> D;
            vector<int> a(D);
            for (int i = 0; i < D; ++i) {
                cin >> a[i];
                --a[i];
            }
            for (int i = 0; i < D; ++i) {
                g[a[i]].push_back(i + n);
            }
            dfs(root, -1);
            cout << (dp[0][root] >= infL ? -1 : dp[0][root]) << '\n';
            for (int i = 0; i < D; ++i) {
                g[a[i]].pop_back();
            }
        }
    }
    return 0;
}

Subtask #1
0.0 / 0.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Execution timed out 1080 ms 6996 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 117 ms 6036 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 9516 KB Output is correct
2 Correct 19 ms 9496 KB Output is correct
3 Correct 63 ms 20148 KB Output is correct
4 Correct 76 ms 22704 KB Output is correct
5 Correct 50 ms 18688 KB Output is correct

Subtask #4
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 272 ms 7740 KB Output is correct
2 Correct 172 ms 6900 KB Output is correct
3 Correct 225 ms 6532 KB Output is correct
4 Correct 282 ms 7128 KB Output is correct
5 Correct 238 ms 7224 KB Output is correct
6 Correct 294 ms 7452 KB Output is correct

Subtask #5
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 108 ms 10704 KB Output is correct
2 Incorrect 172 ms 10716 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1081 ms 12712 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Execution timed out 1080 ms 6996 KB Time limit exceeded
3 Halted 0 ms 0 KB -