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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#487755#7684. Sweet SugaryaoyWA 148ms3880kbC++202.1kb2024-07-23 09:36:162024-07-23 09:36:16

Judging History

你现在查看的是最新测评结果

  • [2024-07-23 09:36:16]
  • 评测
  • 测评结果:WA
  • 用时:148ms
  • 内存:3880kb
  • [2024-07-23 09:36:16]
  • 提交

answer

#include <bits/stdc++.h>

using i64 = long long;

void solve() {
    int n, k;
    std::cin >> n >> k;

    std::vector<int> c(n);
    for (int i = 0; i < n; i++) {
        std::cin >> c[i];
    }

    std::vector<std::vector<int>> adj(n);
    for (int i = 0; i < n - 1; i++) {
        int u, v;
        std::cin >> u >> v;
        u--, v--;

        adj[u].emplace_back(v);
        adj[v].emplace_back(u);
    }

    int ans = 0;
    std::vector<std::array<int, 2>> dp(n);
    auto dfs = [&](auto self, int u, int f) -> void {
        for (auto v : adj[u]) {
            if (v == f) {
                continue;
            }
            self(self, v, u);
            if (dp[v][k % 2] >= k) {
                ans++;
                continue;
            }
            auto ndp = dp[u];
            ndp[0] = std::max(ndp[0], dp[u][0] + dp[v][0]);
            if (dp[v][1] > 0) {
                ndp[1] = std::max(ndp[1], dp[u][0] + dp[v][1]);
                if (dp[u][1] > 0) {
                    ndp[0] = std::max(ndp[0], dp[u][1] + dp[v][1]);
                }
            }
            if (dp[u][1] > 0) {
                ndp[1] = std::max(ndp[1], dp[u][1] + dp[v][0]);
            }
            std::swap(dp[u], ndp);
        }

        auto ndp = dp[u];
        if (c[u] % 2) {
            if (dp[u][1] > 0) {
                ndp[0] = std::max(ndp[0], dp[u][1] + c[u]);
            } else {
                ndp[0] = 0;
            }
            ndp[1] = std::max(ndp[1], dp[u][0] + c[u]);
        } else {
            if (dp[u][1] > 0) {
                ndp[1] = std::max(ndp[1], dp[u][1] + c[u]);
            }
            ndp[0] = std::max(ndp[0], dp[u][0] + c[u]);
        }
        std::swap(dp[u], ndp);

        assert(dp[u][0] % 2 == 0 && (dp[u][1] % 2 || dp[u][1] == 0));
    };
    dfs(dfs, 0, -1);

    if (dp[0][k % 2] >= k) {
        ans++;
    }
    std::cout << ans << "\n";
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int t;
    std::cin >> t;

    while (t--) {
        solve();
    }

    return 0;
}
 

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 3636kb

input:

4
7 5
1 2 1 2 2 1 2
1 2
2 3
3 4
3 5
5 6
5 7
2 2
1 0
1 2
1 1
1
1 2
1

output:

2
0
1
0

result:

ok 4 number(s): "2 0 1 0"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3880kb

input:

12
1 1
0
1 1
1
1 1
2
1 2
0
1 2
1
1 2
2
1 3
0
1 3
1
1 3
2
1 2000000
0
1 2000000
1
1 2000000
2

output:

0
1
0
0
0
1
0
0
0
0
0
0

result:

ok 12 numbers

Test #3:

score: -100
Wrong Answer
time: 148ms
memory: 3640kb

input:

200000
5 2
1 1 0 0 1
2 4
5 2
4 1
3 2
5 1
0 0 0 0 0
5 1
1 2
3 2
5 4
5 3
1 0 0 0 1
1 4
4 2
3 4
5 2
5 9
1 0 0 0 2
4 3
2 1
3 1
5 1
5 3
0 1 1 0 1
5 4
2 1
4 3
5 1
5 1
0 2 1 1 1
5 3
2 4
3 4
1 4
5 1
1 0 1 1 0
1 5
4 2
1 3
5 2
5 7
0 2 1 1 2
5 1
2 3
2 5
5 4
5 5
0 1 0 1 0
2 4
4 3
5 2
1 5
5 1
0 0 1 0 1
4 1
4 5
2...

output:

1
0
0
0
1
3
3
0
0
2
0
0
2
1
0
0
1
1
0
2
0
1
0
2
1
0
0
0
0
0
1
2
0
0
2
2
0
1
0
0
0
0
3
3
0
0
1
1
2
1
2
0
4
0
1
1
0
1
0
0
1
5
0
1
1
1
0
1
1
1
1
1
1
0
1
1
1
0
3
1
0
1
0
0
4
0
0
0
1
1
0
0
1
0
2
0
5
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
0
0
0
0
0
1
0
0
1
1
0
1
0
1
1
1
2
0
1
2
0
0
2
0
0
1
0
0
0
0
0
...

result:

wrong answer 247th numbers differ - expected: '0', found: '1'