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QOJ
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 |
---|---|---|---|---|---|---|---|---|---|
#808293 | #8551. DFS Order 5 | ucup-team2179 | WA | 52ms | 9768kb | C++23 | 2.9kb | 2024-12-10 19:34:17 | 2024-12-10 19:34:23 |
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);
// for(int i=1;i<=n;i++)cout<<i<<" "<<siz[i]<<endl;
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;
}
详细
Test #1:
score: 100
Accepted
time: 2ms
memory: 9768kb
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: 52ms
memory: 9760kb
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 No No No No No No No No No No No 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 Yes No No No No No No No ...
result:
wrong answer 89th words differ - expected: 'No', found: 'Yes'