oj.uz

답안 #415604

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
415604 2021-06-01T09:33:35 Z KoD The Xana coup (BOI21_xanadu) C++17
100 / 100
 117 ms 23236 KB 
#include <bits/stdc++.h>

template <class T> using Vec = std::vector<T>;

constexpr int INF = 1000000000;

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int N;
    std::cin >> N;
    Vec<Vec<int>> graph(N);
    for (int i = 0; i < N - 1; ++i) {
        int a, b;
        std::cin >> a >> b;
        a -= 1;
        b -= 1;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }
    Vec<int> C(N);
    for (auto& x : C) {
        std::cin >> x;
    }
    Vec<std::array<std::array<int, 2>, 2>> dp(N);
    auto dfs = [&](auto&& dfs, const int u, const int p) -> void {
        for (const auto v : graph[u]) {
            if (v != p) {
                dfs(dfs, v, u);
            }
        }
        for (const auto i : { 0, 1 }) {
            auto& cur = dp[u][i];
            cur[C[u] ^ i] = i;
            cur[C[u] ^ i ^ 1] = INF;
            for (const auto v : graph[u]) {
                if (v != p) {
                    std::array<int, 2> next;
                    next.fill(INF);
                    for (const auto j : { 0, 1 }) {
                        for (const auto k : { 0, 1 }) {
                            next[j ^ k] = std::min(next[j ^ k], cur[j] + dp[v][k][i]);
                        }
                    }
                    cur = std::move(next);
                }
            }
        }
    };
    dfs(dfs, 0, -1);
    int ans = INF;
    for (const auto i : { 0, 1 }) {
        ans = std::min(ans, dp[0][i][0]);
    }
    if (ans == INF) {
        std::cout << "impossible\n";
    }
    else {
        std::cout << ans << '\n';
    }
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 312 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 312 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 316 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 316 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 89 ms 22992 KB Output is correct
2 Correct 92 ms 22788 KB Output is correct
3 Correct 86 ms 23220 KB Output is correct

Subtask #4
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 74 ms 23008 KB Output is correct
2 Correct 75 ms 22728 KB Output is correct
3 Correct 75 ms 23236 KB Output is correct
4 Correct 80 ms 8044 KB Output is correct
5 Correct 84 ms 8924 KB Output is correct
6 Correct 93 ms 9168 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 22 ms 3288 KB Output is correct
9 Correct 72 ms 9004 KB Output is correct
10 Correct 74 ms 9156 KB Output is correct
11 Correct 75 ms 9932 KB Output is correct
12 Correct 72 ms 10300 KB Output is correct
13 Correct 80 ms 8476 KB Output is correct
14 Correct 72 ms 9052 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 312 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 312 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 316 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 316 KB Output is correct
17 Correct 89 ms 22992 KB Output is correct
18 Correct 92 ms 22788 KB Output is correct
19 Correct 86 ms 23220 KB Output is correct
20 Correct 74 ms 23008 KB Output is correct
21 Correct 75 ms 22728 KB Output is correct
22 Correct 75 ms 23236 KB Output is correct
23 Correct 80 ms 8044 KB Output is correct
24 Correct 84 ms 8924 KB Output is correct
25 Correct 93 ms 9168 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 22 ms 3288 KB Output is correct
28 Correct 72 ms 9004 KB Output is correct
29 Correct 74 ms 9156 KB Output is correct
30 Correct 75 ms 9932 KB Output is correct
31 Correct 72 ms 10300 KB Output is correct
32 Correct 80 ms 8476 KB Output is correct
33 Correct 72 ms 9052 KB Output is correct
34 Correct 1 ms 204 KB Output is correct
35 Correct 1 ms 204 KB Output is correct
36 Correct 1 ms 308 KB Output is correct
37 Correct 1 ms 312 KB Output is correct
38 Correct 1 ms 204 KB Output is correct
39 Correct 1 ms 204 KB Output is correct
40 Correct 1 ms 204 KB Output is correct
41 Correct 1 ms 204 KB Output is correct
42 Correct 1 ms 204 KB Output is correct
43 Correct 1 ms 312 KB Output is correct
44 Correct 1 ms 308 KB Output is correct
45 Correct 76 ms 23016 KB Output is correct
46 Correct 88 ms 22688 KB Output is correct
47 Correct 77 ms 23192 KB Output is correct
48 Correct 80 ms 8164 KB Output is correct
49 Correct 83 ms 8912 KB Output is correct
50 Correct 81 ms 9028 KB Output is correct
51 Correct 2 ms 332 KB Output is correct
52 Correct 20 ms 3304 KB Output is correct
53 Correct 82 ms 9088 KB Output is correct
54 Correct 71 ms 9200 KB Output is correct
55 Correct 73 ms 10016 KB Output is correct
56 Correct 84 ms 10336 KB Output is correct
57 Correct 63 ms 8456 KB Output is correct
58 Correct 117 ms 9040 KB Output is correct
59 Correct 32 ms 3140 KB Output is correct
60 Correct 77 ms 8256 KB Output is correct
61 Correct 73 ms 9028 KB Output is correct
62 Correct 68 ms 9216 KB Output is correct
63 Correct 86 ms 9228 KB Output is correct
64 Correct 116 ms 9192 KB Output is correct
65 Correct 88 ms 9540 KB Output is correct
66 Correct 91 ms 9568 KB Output is correct
67 Correct 51 ms 9376 KB Output is correct
68 Correct 52 ms 9468 KB Output is correct
69 Correct 55 ms 9496 KB Output is correct
70 Correct 85 ms 9456 KB Output is correct