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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#808326 | #8551. DFS Order 5 | ucup-team2179 | WA | 53ms | 9952kb | C++23 | 2.8kb | 2024-12-10 19:50:22 | 2024-12-10 19:50:24 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
#define pb push_back
#define pii pair<int, int>
using namespace std;
const int maxn=300050;
int par[maxn][22];
int dep[maxn];
int siz[maxn];
int C=20;
int L[maxn];
int R[maxn];
int cnt=0;
vector<int> a[maxn];
void dfs(int u,int pre) //根节点深度为1
{
dep[u]=dep[pre]+1;
cnt++;
L[u]=cnt;
par[u][0]=pre;
siz[u]=1;
for(int i=1;i<C;i++)
{
par[u][i]=par[par[u][i-1]][i-1];
}
for(auto p:a[u])
{
if(p==pre)
continue;
dfs(p,u);
siz[u]+=siz[p];
}
R[u]=cnt;
}
int lca(int x,int y)
{
if(dep[y]>dep[x])swap(x,y);
for(int i=C-1;i>=0;i--)
{
if(dep[par[x][i]]>=dep[y])
x=par[x][i];
}
if(x==y)return y;
for(int i=C-1;i>=0;i--)
if(par[x][i]!=par[y][i])
{
x=par[x][i];
y=par[y][i];
}
return par[x][0];
}
int LCA(int u, int v) {
return lca(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;
a[u].push_back(v);
a[v].push_back(u);
}
dfs(1, 0);
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]) == par[arr[i + 1]][0]);
// 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
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Test #1:
score: 100
Accepted
time: 2ms
memory: 9940kb
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: 53ms
memory: 9952kb
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'