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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#708228 | #8551. DFS Order 5 | ucup-team1264# | WA | 78ms | 12004kb | C++20 | 2.2kb | 2024-11-03 20:36:07 | 2024-11-03 20:36:14 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
constexpr int w = 1 << 19, N = 101145;
int tr[w + N];
vector<int> adj[N];
int st[N], ed[N], dep[N];
int cnt = 0;
int fa[19][N];
int n, q;
void add(int p, int v) {
for (p += w; p; p >>= 1) {
tr[p] += v;
}
}
// 左闭右开
int sum(int l, int r) {
int ans = 0;
l += w, r += w;
while (l < r) {
if (l & 1) ans += tr[l++];
if (r & 1) ans += tr[--r];
l >>= 1, r >>= 1;
}
return ans;
}
void dfs(int u, int f) {
fa[0][u] = f;
st[u] = cnt++;
for (int v: adj[u]) {
if (v == f) continue;
dep[v] = dep[u] + 1;
dfs(v, u);
}
ed[u] = cnt;
}
int lca(int u, int v) {
if (dep[u] < dep[v]) swap(u, v);
int diff = dep[u] - dep[v];
for (int b = 18; b >= 0; b--) {
if (diff >> b & 1) u = fa[b][u];
}
for (int b = 18; b >= 0; b--) {
if (fa[b][u] != fa[b][v]) {
u = fa[b][u]; v = fa[b][v];
}
}
if (u == v) return u;
return fa[0][u];
}
void solve() {
int m; cin >> m;
vector<int> a(m);
for (int &x: a) cin >> x, x--;
add(st[a[0]], 1);
bool ans = true;
for (int i = 1; i < m; i++) {
if (sum(st[a[i]], ed[a[i]])) ans = false;
if (lca(a[i - 1], a[i]) != fa[0][a[i]]) ans = false;
if (a[i - 1] != fa[0][a[i]]) {
for (int u = a[i - 1]; !(st[u] <= st[a[0]] && st[a[0]] < ed[u]) && u != fa[0][a[i]]; u = fa[0][u]) {
if (sum(st[u], ed[u]) != ed[u] - st[u]) {
ans = false;
break;
}
}
}
add(st[a[i]], 1);
}
for (int x: a) add(st[x], -1);
cout << (ans ? "Yes" : "No") << "\n";
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> q;
for (int e = 1; e < n; e++) {
int u, v; cin >> u >> v;
u--, v--;
adj[u].push_back(v);
adj[v].push_back(u);
}
dfs(0, 0);
for (int b = 1; b < 19; b++) {
for (int u = 0; u < n; u++)
fa[b][u] = fa[b - 1][fa[b - 1][u]];
}
while (q--) {
solve();
}
}
Details
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Test #1:
score: 100
Accepted
time: 2ms
memory: 12004kb
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: 78ms
memory: 9728kb
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 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 30th words differ - expected: 'No', found: 'Yes'