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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
#602795#8720. BFS 序 0UESTC_OldEastWest#RE 154ms52440kbC++173.3kb2024-10-01 12:52:382024-10-01 12:52:38

Judging History

你现在查看的是最新测评结果

  • [2024-10-01 12:52:38]
  • 评测
  • 测评结果:RE
  • 用时:154ms
  • 内存:52440kb
  • [2024-10-01 12:52:38]
  • 提交

answer

#include <bits/stdc++.h>
const int N = 20;

void charming() {
  int n; std::cin >> n;
  std::vector<std::array<int, N> > fa(n);
  std::vector<std::vector<int> > G(n);
  for (int i = 1; i < n; ++i) {
    std::cin >> fa[i][0], --fa[i][0];
    G[fa[i][0]].emplace_back(i);
  }

  std::vector<int> dep(n);
  std::function<void(int, int)> DFS = [&](int f, int u) {
    fa[u][0] = f;
    for (int i = 1; i < N; ++i) {
      if (fa[u][i - 1] == -1) fa[u][i] = fa[u][i - 1];
      else fa[u][i] = fa[fa[u][i - 1]][i - 1];
    }

    for (int v : G[u]) {
      if (v == f) continue;
      else dep[v] = dep[u] + 1, DFS(u, v);
    }
  };
  DFS(-1, 0);

  std::function<int(int, int)> jump = [&](int x, int d) {
    assert(d <= dep[x]);
    for (int i = N - 1; i >= 0; --i) {
      if (d >> i & 1) x = fa[x][i];
    }
    return x;
  };

  std::function<int(int, int)> getLca = [&](int u, int v) {
    if (dep[u] != dep[v]) {
      if (dep[u] < dep[v]) std::swap(u, v);
      u = jump(u, dep[u] - dep[v]);
    }
    if (u == v) return u;
    for (int i = N - 1; i >= 0; --i) {
      if (fa[u][i] != fa[v][i]) {
        u = fa[u][i];
        v = fa[v][i];
      }
    }
    return fa[u][0];
  };

  
  int q; std::cin >> q;
  std::vector<int> vis(n), du(n);
  std::vector<std::vector<int> > nG(n);

  for (int i = 0, m; i < q; ++i) {
    std::cin >> m;

    bool ok = true;
    std::vector<int> vec(m);
    for (int j = 0; j < m; ++j) {
      std::cin >> vec[j], --vec[j];
      if (j && dep[vec[j]] < dep[vec[j - 1]]) ok = false;
    }
    if (!ok) std::cout << "No\n";
    else {
      int now = 0;
      std::vector<int> used;
      while (now < m) {
        int nxt = now;
        while (nxt < m && dep[vec[nxt]] == dep[vec[now]]) ++nxt;

//        std::cout << now << ' ' << nxt << std::endl;

        for (int j = now + 1, u, v; j < nxt; ++j) {
          u = vec[j - 1], v = vec[j];
          int lca = getLca(u, v);
          int fu = jump(u, dep[u] - dep[lca] - 1);
          int fv = jump(v, dep[v] - dep[lca] - 1);

//          std::cout << u << ' ' << v << ' ' << lca << std::endl;
//          std::cout << u << ' ' << fu << std::endl;
//          std::cout << v << ' ' << fv << std::endl;
          
          if (!vis[fu]) vis[fu] = 1, used.emplace_back(fu);
          if (!vis[fv]) vis[fv] = 1, used.emplace_back(fv);
          nG[fu].emplace_back(fv);
        }
        now = nxt;

//        std::cout << "Finished." << std::endl;
      }
      
      for (int u : used) {
      	for (int v : nG[u]) ++du[v];
      }
      
      std::vector<int> que;
      int head = 0, tail = 0;
      for (int u : used) if (!du[u]) que.emplace_back(u), ++tail;
      while (head < tail) {
      	int u = que[head++];
      	vis[u] = 0;
      	for (int v : nG[u]) {
      		--du[v];
      		if (!du[v]) que.emplace_back(v), ++tail;
      	}
      }
      for (int u : used) {
      	nG[u].clear();
      	if (vis[u] || du[u]) ok = false, vis[u] = du[u] = 0;
      }
			used.clear();
			
      if (!ok) std::cout << "No\n";
      else std::cout << "Yes\n";
    }
  }
}

signed main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(NULL);
  std::cout.tie(NULL);
  charming();
  return 0;
}


/*
12
1 1 2 3 4 5 6 6 6 7 8
1
5
2 3 6 8 11
*/

詳細信息

Test #1:

score: 100
Accepted
time: 1ms
memory: 3484kb

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: 154ms
memory: 51772kb

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: 138ms
memory: 52212kb

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: 137ms
memory: 52440kb

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: -100
Runtime Error

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:


result: