QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#808573#8551. DFS Order 5TJUHuangTaoWA 44ms32268kbC++203.7kb2024-12-10 21:36:552024-12-10 21:36:55

Judging History

你现在查看的是最新测评结果

  • [2024-12-10 21:36:55]
  • 评测
  • 测评结果:WA
  • 用时:44ms
  • 内存:32268kb
  • [2024-12-10 21:36:55]
  • 提交

answer

#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define pii pair<int, int>
#define ll long long
using namespace std;
const int maxn = 2e5 + 10;
vector<int> G[maxn];
int siz[maxn], fa[maxn], L[maxn], R[maxn], ncnt;
struct RMQlca {
    int dfn[maxn << 1], tot, st[23][maxn << 1], pos[maxn], rev[23][maxn << 1],
        dep[maxn << 1], lg[maxn << 1];
    void dfs(int u, int deep) {
        dfn[++tot] = u, dep[tot] = deep, pos[u] = tot;
        L[u] = ++ncnt;
        siz[u] = 1;
        for (auto v : G[u]) {
            if (!pos[v]) {
                fa[v] = u;
                dfs(v, deep + 1);
                siz[u] += siz[v];
                dfn[++tot] = u, dep[tot] = deep;
            }
        }
        R[u] = ncnt;
    }
    void init() {
        for (int i = 2; i <= tot + 1; i++)
            lg[i] = lg[i >> 1] + 1;
        for (int i = 1; i <= tot; i++)
            st[0][i] = dep[i], rev[0][i] = dfn[i];
        for (int i = 1; i <= lg[tot]; i++)
            for (int j = 1; j + (1 << i) - 1 <= tot; j++)
                if (st[i - 1][j] < st[i - 1][j + (1 << i - 1)])
                    st[i][j] = st[i - 1][j], rev[i][j] = rev[i - 1][j];
                else
                    st[i][j] = st[i - 1][j + (1 << i - 1)],
                    rev[i][j] = rev[i - 1][j + (1 << i - 1)];
    }
    int LCA2(int l, int r) {
        if (pos[l] > pos[r])
            swap(l, r);
        l = pos[l], r = pos[r];
        int k = lg[r - l + 1];
        return st[k][l] < st[k][r + l - (1 << k)] ? rev[k][l]
                                                  : rev[k][r + 1 - (1 << k)];
    }
} rmqlca;
int LCA(int u, int v) {
    return rmqlca.LCA2(u, v);
}
struct stable {
    vector<vector<int>> mylist;
    int n;
    int (*op)(int a, int b);
    stable(vector<int>& a, int (*f)(int, int)) {
        op = f;
        n = a.size() - 1;
        mylist = vector<vector<int>>(n + 1, vector<int>(__lg(n) + 1));
        for (int i = 1; i <= n; i++)
            mylist[i][0] = a[i];
        for (int j = 1; j <= __lg(n); j++)
            for (int i = 1; i <= n - (1 << j) + 1; i++)
                mylist[i][j] =
                    op(mylist[i][j - 1], mylist[i + (1 << j - 1)][j - 1]);
    }
    int q(int l, int r) {
        assert(l >= 1 && r <= n && l <= r);
        int len = __lg(r - l + 1);
        return op(mylist[l][len], mylist[r - (1 << len) + 1][len]);
    }
};
void solve() {
    ncnt = 0;
    int n, q;
    cin >> n >> q;
    for (int i = 1; i < n; i++) {
        int u, v;
        cin >> u >> v;
        G[u].push_back(v);
        G[v].push_back(u);
    }
    rmqlca.dfs(1, 1);
    rmqlca.init();
    while (q--) {
        int k;
        cin >> k;
        set<int> s;
        vector<int> arr(k + 1);
        for (int i = 1; i <= k; i++)
            cin >> arr[i], s.insert(arr[i]);
        if (s.size() != k) {
            cout << "No\n";
            continue;
        }
        s.clear();
        stable st(arr, LCA);
        int flag = 1;
        for (int i = 1; i < k && flag; i++)
            flag &= LCA(arr[i], arr[i + 1]) == fa[arr[i + 1]];
        for (int i = 1; i <= k && flag; i++) {
            flag &= arr[i] == st.q(i, min(k, i + siz[arr[i]] - 1));
        }
        for (int i = 1; i <= k && flag; i++) {
            if (s.lower_bound(L[arr[i]]) != s.end() &&
                *s.lower_bound(L[arr[i]]) <= R[arr[i]])
                flag = 0;
            s.insert(L[arr[i]]);
        }
        if (flag)
            cout << "Yes\n";
        else
            cout << "No\n";
    }
}
signed main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 28148kb

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: 44ms
memory: 32268kb

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
No
No
No
No
No
No
No
No
N...

result:

wrong answer 479th words differ - expected: 'Yes', found: 'No'