QOJ.ac

QOJ

ID	题目	提交者	结果	用时	内存	语言	文件大小	提交时间	测评时间
#805755	#8551. DFS Order 5	kjhhjki^#	WA	30ms	3832kb	C++20	3.7kb	2024-12-08 18:24:19	2024-12-08 18:24:20

Judging History

你现在查看的是最新测评结果

[2024-12-08 18:24:20]
评测

测评结果：WA
用时：30ms
内存：3832kb

查看

[2024-12-08 18:24:19]
提交

answer

#include <bits/stdc++.h>

template<typename T, typename U>
void chkmin(T &a, U b) { if (a > b) a = b; }

using i64 = long long;

struct Fenwick {
    int n;
    std::vector<int> t;
    Fenwick(int _n = 0, int x = 0) { init(std::vector<int>(_n + 1, x)); }
    Fenwick(const std::vector<int> &a) { init(a); }
    static constexpr int lowbit(int x) { return x & -x; }
    void init(const std::vector<int> &a) {
        n = a.size() - 1;
        t.assign(n + 1, 0);
        for (int i = 1; i <= n; ++i) {
            t[i] += a[i];
            if (i + lowbit(i) <= n) {
                t[i + lowbit(i)] += t[i];
            }
        }
    }
    void add(int i, int k) { while (i <= n) t[i] += k, i += lowbit(i); }
    int query(int i) { int ans = 0; while (i) ans += t[i], i -= lowbit(i); return ans; }
    int query(int l, int r) { return query(r) - query(l - 1); }
};

void solve()
{
    int n, q;
    std::cin >> n >> q;
    std::vector<std::vector<int>> adj(n);
    for (int i = 1; i < n; ++i) {
        int u, v;
        std::cin >> u >> v;
        adj[--u].push_back(--v);
        adj[v].push_back(u);
    }
    std::vector<int> dfn(n, -1), seq = dfn, top(n), dep(n), pre = dfn, sz(n, 1);
    auto dfs1 = [&](auto &&self, int u) -> void {
        if (pre[u] != -1) {
            adj[u].erase(std::ranges::find(adj[u], pre[u]));
        }
        for (auto &v: adj[u]) {
            dep[v] = dep[u] + 1;
            pre[v] = u;
            self(self, v);
            sz[u] += sz[v];
            if (sz[v] > sz[adj[u][0]]) {
                std::swap(v, adj[u][0]);
            }
        }
    };
    dfs1(dfs1, 0);
    int t = 0;
    auto dfs2 = [&](auto &&self, int u) -> void {
        dfn[u] = t; seq[t++] = u;
        for (auto v: adj[u]) {
            top[v] = (v == adj[u][0]? top[u]: v);
            self(self, v);
        }
    };
    dfs2(dfs2, 0);
    auto lca = [&](int u, int v) {
        while (top[u] != top[v]) {
            if (dep[top[u]] < dep[top[v]]) {
                v = pre[top[v]];
            } else {
                u = pre[top[u]];
            }
        }
        return dep[u] < dep[v]? u: v;
    };
    auto cmp = [&](int u, int v) { return dfn[u] < dfn[v]; };
    auto find = [&](int u, int v) {
        auto it = std::ranges::lower_bound(adj[u], v, cmp);
        return it != adj[u].end() && *it == v;
    };
    std::vector<bool> vis(n);
    while (q --) {
        int k;
        std::cin >> k;
        std::vector<int> v(k), st;
        for (auto &x: v) {
            std::cin >> x;
            --x;
            vis[x] = false;
        }
        bool f = true;
        for (int i = 0; i < k; ++i) {
            if ((!st.empty()) && !find(v[st.back()], v[i])) {
                int p = lca(v[st.back()], v[i]);
                if (!find(p, v[i])) {
                    f = false;
                    break;
                }
                while (!st.empty()) {
                    int t = st.back();
                    if (p == v[t]) {
                        break;
                    }
                    st.pop_back();
                    if (i - t < sz[v[t]]) {
                        f = false;
                        break;
                    }
                }
            }
            if (!f) {
                break;
            }
            st.push_back(i);
            vis[v[i]] = true;
        }
        std::cout << (f? "Yes": "No") << '\n';
    }
}

int main()
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int T = 1;
    // std::cin >> T;
    while (T --) solve();
    return 0;
}

/*
6 1
1 2
1 3
2 4
3 5
2 6
2 4 1
2 4 2
2 4 3
2 4 4
2 4 5
2 4 6
6 1 2 6 4 3 5
*/

源文件, 语言: C++20

詳細信息

Test #1:

score: 100

Accepted

time: 0ms

memory: 3532kb

input:

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

output:

No
No
Yes
No
No
Yes
Yes

result:

ok 7 tokens

Test #2:

score: -100

Wrong Answer

time: 30ms

memory: 3832kb

input:

10 100000
7 2
1 7
7 10
8 6
8 7
1 3
4 5
9 5
5 8
8 8 9 7 2 8 1 6 1
4 8 3 5 2
6 7 10 3 9 9 1
1 1
8 10 3 2 9 3 8 7 3
7 5 6 2 8 5 9 1
6 3 4 6 2 1 3
5 8 9 2 4 9
1 3
2 1 5
5 8 5 1 7 9
10 5 2 9 2 6 4 10 6 3 8
3 4 5 8
2 8 4
9 4 10 1 2 4 3 3 6 3
1 3
6 1 1 6 8 3 1
3 7 3 2
3 9 1 5
4 3 7 8 10
9 4 2 3 10 2 5 4 3 ...

output:

No
No
No
Yes
No
No
No
No
Yes
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
Yes
No
No
No
No
No
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
Yes
Yes
No
No
No
No
Yes
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
...

result:

wrong answer 89th words differ - expected: 'No', found: 'Yes'