QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#423677 | #8720. BFS 序 0 | kjhhjki# | AC ✓ | 299ms | 46580kb | C++14 | 3.3kb | 2024-05-28 15:01:11 | 2024-05-28 15:01:11 |
Judging History
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;
HLD(i32 n = 0) { init(n); }
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>());
}
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] - 2 * dep[lca(u,v)]; }
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;
else 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;
}
这程序好像有点Bug,我给组数据试试?
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
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: 250ms
memory: 45412kb
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: 288ms
memory: 46420kb
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: 299ms
memory: 46580kb
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: 3ms
memory: 3660kb
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: 0
Accepted
time: 6ms
memory: 3696kb
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:
No No Yes No Yes No No No No No No No No No Yes No No No No No No Yes No No No No No No Yes No No No No No No No No Yes Yes No No No Yes No No No No No No No No No No No No Yes No No No No No No No No No No No No No Yes No Yes No No No No No No No No Yes No No No Yes No No Yes No No No No No No No N...
result:
ok 10000 token(s): yes count is 1492, no count is 8508
Test #7:
score: 0
Accepted
time: 5ms
memory: 3652kb
input:
8 1 1 2 4 2 4 6 10000 5 2 6 6 2 1 3 7 3 8 2 8 1 5 7 5 1 2 7 3 2 3 5 3 8 4 3 5 8 2 4 5 3 4 3 2 1 8 6 6 8 4 5 3 1 6 3 1 2 7 4 6 4 8 6 4 3 5 4 7 6 8 5 11 2 1 6 5 2 7 1 3 3 5 4 4 6 1 7 2 7 6 2 7 8 4 1 3 3 4 6 7 3 7 1 6 38 3 4 6 6 3 4 8 1 5 3 1 8 8 6 2 3 6 7 8 8 4 2 3 7 3 3 6 7 7 5 7 5 8 8 5 4 5 7 1 8 5 ...
output:
No No No No Yes No No No No No No No No No No Yes No No Yes No No No No No Yes No Yes No No No Yes Yes No No No No No No Yes No No No No No No No No No No No Yes No No No No No No No No No Yes No No No No No No No No No No No No No No Yes No No No No No No No No No No No No No No Yes No No No No No ...
result:
ok 10000 token(s): yes count is 1568, no count is 8432
Test #8:
score: 0
Accepted
time: 4ms
memory: 3832kb
input:
7 1 2 3 1 2 5 10000 5 1 7 3 5 6 5 5 3 2 7 4 4 5 2 6 4 12 3 1 5 5 6 6 3 5 3 5 3 3 11 2 3 2 6 7 3 6 6 3 3 3 2 3 2 6 1 3 4 2 6 7 3 2 7 1 6 5 2 7 3 4 1 27 2 5 6 1 7 1 7 1 4 6 7 1 6 2 1 7 1 3 4 4 7 7 2 6 4 4 3 2 5 6 1 7 3 3 1 4 4 1 7 3 4 3 4 2 1 4 4 1 6 7 4 6 2 7 4 4 5 1 6 4 1 3 5 1 2 3 5 7 5 2 3 7 6 5 1...
output:
No No Yes No No No No No No No Yes Yes No Yes No No No No Yes No No No No Yes No No Yes 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 No Yes Yes No Yes Yes No No No No No No No No No No Yes No No No No No No No No Yes No Yes No No No No Yes Yes Yes Yes Yes Yes Ye...
result:
ok 10000 token(s): yes count is 2205, no count is 7795
Extra Test:
score: 0
Extra Test Passed