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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
#808245#8551. DFS Order 5ucup-team2179WA 46ms34320kbC++233.5kb2024-12-10 18:51:002024-12-10 18:51:03

Judging History

你现在查看的是最新测评结果

  • [2024-12-10 18:51:03]
  • 评测
  • 测评结果:WA
  • 用时:46ms
  • 内存:34320kb
  • [2024-12-10 18:51:00]
  • 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];
struct RMQlca {
    int dfn[maxn << 1], tot=0, st[23][maxn << 1], pos[maxn],R[maxn],L[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]=tot;
        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]=tot;
    }
    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() {
    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, 0);
    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(rmqlca.L[arr[i]])!=s.end()&&(*s.lower_bound(rmqlca.L[arr[i]])<=rmqlca.R[arr[i]]))flag=0;
            s.insert(rmqlca.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;
}

详细

Test #1:

score: 100
Accepted
time: 2ms
memory: 28224kb

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: 46ms
memory: 34320kb

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

result:

wrong answer 20th words differ - expected: 'No', found: 'Yes'