oj.uz

답안 #574396

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
574396 2022-06-08T13:14:06 Z piOOE Spring cleaning (CEOI20_cleaning) C++17
34 / 100
 1000 ms 21272 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 = 100000, infI = 1e9 + 7;
const ll infL = 3e18;

vector<int> g[N * 2];
ll dp[3][N * 2]; //LL???

void dfs(int v, int 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);
    while (q--) {
        int D;
        cin >> D;
        vector<int> a(D);
        for (int i = 0; i < D; ++i) {
            cin >> a[i];
            --a[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 1091 ms 6300 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 7892 KB Output is correct
2 Correct 14 ms 7892 KB Output is correct
3 Correct 30 ms 10956 KB Output is correct
4 Correct 72 ms 12864 KB Output is correct
5 Correct 79 ms 14648 KB Output is correct

Subtask #3
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 8404 KB Output is correct
2 Correct 16 ms 8408 KB Output is correct
3 Correct 41 ms 18224 KB Output is correct
4 Correct 60 ms 21272 KB Output is correct
5 Correct 37 ms 18032 KB Output is correct

Subtask #4
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 230 ms 6876 KB Output is correct
2 Correct 156 ms 6348 KB Output is correct
3 Correct 211 ms 6116 KB Output is correct
4 Correct 259 ms 6740 KB Output is correct
5 Correct 239 ms 6868 KB Output is correct
6 Correct 261 ms 6700 KB Output is correct

Subtask #5
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1079 ms 8532 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1095 ms 10488 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 1091 ms 6300 KB Time limit exceeded
3 Halted 0 ms 0 KB -