QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#423663#8720. BFS 序 0kjhhjki#RE 256ms46660kbC++203.3kb2024-05-28 14:51:012024-05-28 14:51:03

Judging History

你现在查看的是最新测评结果

  • [2024-05-28 14:51:03]
  • 评测
  • 测评结果:RE
  • 用时:256ms
  • 内存:46660kb
  • [2024-05-28 14:51:01]
  • 提交

answer

#include <bits/stdc++.h>
#define For(i, a, b) for(i32 i = (a), endi = (b); i <= endi; ++i)
#define foR(i, a, b) for(i32 i = (a), endi = (b); i >= endi; --i)

using i32 = int; 
using i64 = long long;

struct HLD
{
    i32 n, t = 0;
    std::vector<i32> sz, top, dep, pre, dfn, out, seq;
    std::vector<std::vector<i32>> adj;
    void init(i32 _n = 0)
    {
        n = _n; t = 0;
        sz.assign(n+1, 1); seq.assign(n+1, 0);
        dep = pre = top = dfn = out = seq;
        adj.assign(n+1, std::vector<i32>());
    }
    HLD(i32 n = 0) { init(n); }
    void addEdge(i32 u, i32 v) { adj[u].push_back(v); adj[v].push_back(u); }

    void work(i32 rt = 1)
    {
        pre[rt] = 0; dep[rt] = 1; top[rt] = rt;
        dfs1(rt); dfs2(rt);
    }
    void dfs1(i32 u)
    {
        if(pre[u]) adj[u].erase(find(adj[u].begin(), adj[u].end(), pre[u]));
        sz[u] = 1;
        for(auto &v: adj[u])
        {
            pre[v] = u; dep[v] = dep[u] + 1;
            dfs1(v); sz[u] += sz[v];
            if(sz[v] > sz[adj[u][0]]) std::swap(v, adj[u][0]);
        }
    }
    void dfs2(i32 u)
    {
        dfn[u] = ++t; seq[t] = u;
        for(auto v: adj[u])
            top[v] = (v == adj[u][0]? top[u]: v),
            dfs2(v);
        out[u] = t;
    }

    i32 lca(i32 u, i32 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;
    }
    i32 dis(i32 u, i32 v) { return dep[u] + dep[v] - dep[lca(u, v)] * 2; }
    i32 jump(i32 u, i32 k)
    {
        if(dep[u] < k) return 0;
        while(dep[u] - dep[top[u]] < k) k -= dep[u] - dep[top[u]] + 1, u = pre[top[u]];
        return seq[dfn[u]-k];
    }
};

int main()
{
    std::ios::sync_with_stdio(0);
    std::cin.tie(0);
    i32 n;
    std::cin >> n;
    HLD hld(n);
    For(i, 2, n) 
    {
        i32 p;
        std::cin >> p;
        hld.addEdge(i, p);
    }
    hld.work();
    std::vector<std::vector<i32>> adj(n+1);
    std::vector<i32> in(n+1);
    std::set<i32> used;
    i32 q;
    std::cin >> q;
    while(q--)
    {
        i32 m;
        std::cin >> m;
        std::vector<i32> a(m+1);
        used.clear();
        bool flag = true;
        For(i, 1, m) 
        {
            std::cin >> a[i];
            if(i == 1) continue;
            if(a[i] == a[i-1] || hld.dep[a[i]] < hld.dep[a[i-1]]) flag = false;
            if(hld.dep[a[i]] == hld.dep[a[i-1]])
            {
                i32 lca = hld.lca(a[i], a[i-1]);
                i32 u = hld.jump(a[i-1], hld.dep[a[i-1]] - hld.dep[lca] - 1);
                i32 v = hld.jump(a[i], hld.dep[a[i]] - hld.dep[lca] - 1);
                used.insert(u); used.insert(v);
                adj[u].push_back(v); ++in[v];
            }
        }
        i32 cnt(0); 
        std::queue<i32> q;
        for(auto u: used) if(!in[u]) q.push(u);
        while(!q.empty())
        {
            i32 u = q.front(); q.pop(); ++cnt;
            for(auto v: adj[u])
                if(!--in[v])
                    q.push(v);
        }
        flag &= (cnt == i32(used.size()));
        std::cout << (flag? "Yes": "No") << '\n';
        for(auto u: used) adj[u].clear(), in[u] = 0;
    }
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 3648kb

input:

6
1 1 3 2 4
10
4 3 6 2 5
1 4
3 2 4 5
5 2 5 4 6 3
3 1 4 2
3 5 6 3
5 4 5 2 6 1
4 4 3 2 5
4 4 6 2 3
3 3 2 6

output:

No
Yes
Yes
No
No
No
No
No
No
Yes

result:

ok 10 token(s): yes count is 3, no count is 7

Test #2:

score: 0
Accepted
time: 244ms
memory: 45224kb

input:

300000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

output:

No
Yes
Yes
Yes
No
No
No
No
No
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
No
No
No
Yes
No
No
Yes
No
No
No
No
Yes
Yes
Yes
No
No
Yes
No
No
No
No
No
No
No
Yes
No
Yes
No
Yes
No
No
No
No
Yes
Yes
Yes
No
No
Yes
No
No
No
No
No
Yes
Yes
No
No
No
No
No
Yes
Yes
No
Yes
No
No
No
Yes
No
No
Yes
No
No
Yes
Yes
Yes
No
No
No
Y...

result:

ok 254 token(s): yes count is 89, no count is 165

Test #3:

score: 0
Accepted
time: 249ms
memory: 46380kb

input:

300000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

output:

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

result:

ok 266 token(s): yes count is 102, no count is 164

Test #4:

score: 0
Accepted
time: 256ms
memory: 46660kb

input:

300000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

output:

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

result:

ok 252 token(s): yes count is 87, no count is 165

Test #5:

score: 0
Accepted
time: 7ms
memory: 3548kb

input:

10
1 1 3 3 1 3 1 3 9
10000
4 3 5 6 9
5 3 1 4 9 6
5 6 4 3 5 7
28 8 3 4 3 1 6 3 5 8 7 2 4 4 4 2 7 5 9 2 4 10 8 4 10 3 4 5 7
3 5 2 9
6 4 7 2 3 9 5
5 9 2 5 6 1
12 3 5 8 8 1 3 5 8 4 5 9 1
29 3 9 9 1 5 8 5 5 6 10 8 8 4 8 4 2 8 10 5 7 3 7 1 8 4 7 5 1 6
7 5 9 8 3 2 1 6
4 4 1 9 5
22 10 9 5 4 5 8 10 3 2 1 10 ...

output:

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

result:

ok 10000 token(s): yes count is 1058, no count is 8942

Test #6:

score: -100
Runtime Error

input:

9
1 2 1 2 2 4 2 6
10000
6 5 1 4 3 7 8
14 6 8 7 9 7 5 1 8 3 6 3 8 5 2
2 6 9
17 7 8 6 5 2 1 5 5 9 3 4 1 5 2 7 2 5
3 8 6 5
5 3 9 1 6 8
8 3 5 8 7 9 4 6 2
4 8 9 6 5
7 4 7 2 9 3 8 1
6 1 4 9 5 6 2
4 7 5 4 3
5 9 5 2 1 3
4 4 5 7 3
3 9 1 8
4 4 2 8 6
26 7 4 7 6 1 7 9 4 5 5 8 9 8 2 4 8 9 6 2 8 6 4 5 5 4 4
45 3 ...

output:


result: