QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #639322 | #8551. DFS Order 5 | spacetimewww | WA | 36ms | 13508kb | C++17 | 5.6kb | 2024-10-13 18:59:01 | 2024-10-13 18:59:01 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
#define endl '\n'
using namespace std;
int n, q;
const int N = 100005;
vector<int> g[N + 5];
int fa[N + 5][25];
int dep[N + 5];
int tr[N + 5];
int in[N + 5], out[N + 5];
int tot = 0;
int dfn[N + 5];
int sz[N + 5];
struct Fenwick{
int tr[N + 5] = {0};
int lowbit(int x){
return x & -x;
}
void add(int p, int x){
for (int i = p; i <= 100000; i += lowbit(i)){
tr[i] += x;
}
}
int query(int p){
int res = 0;
for (int i = p; i >= 1; i -= lowbit(i)){
res += tr[i];
}
return res;
}
void modify(int l, int r, int v){
add(l, v);
add(r + 1, -v);
}
int querySeg(int l, int r){
return query(r) - query(l - 1);
}
}fenwick[2];//0:sum(normal), 1:vis(sub)
void dfs(int u, int ffa){
tot++;
dfn[tot] = u;
in[u] = tot;
fa[u][0] = ffa;
sz[u] = 1;
for (int i = 1; (1 << i) + 1 <= dep[u]; i++){
fa[u][i] = fa[fa[u][i - 1]][i - 1];
}
for (auto v : g[u]){
if (v == ffa) continue;
dep[v] = dep[u] + 1;
dfs(v, u);
sz[u] += sz[v];
}
out[u] = tot;
}
int lca(int x, int y){
if (dep[x] < dep[y]) swap(x, y);
for (int i = 20; i >= 0; i--){
if (dep[fa[x][i]] >= dep[y]){
x = fa[x][i];
}
if (x == y) return x;
}
for (int i = 20; i >= 0; i--){
if (fa[x][i] != fa[y][i]) {
x = fa[x][i];
y = fa[y][i];
}
}
return fa[x][0];
}
int getAnc(int x, int d){
int p = x;
for (int bit = 20; bit >= 0; bit--){
if (d >> bit & 1){
p = fa[p][bit];
}
}
return p;
}
signed main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int T = 1;
while (T--){
cin >> n >> q;
vector<int> deg(n + 5);
for (int i = 1; i < n; i++){
int u, v;
cin >> u >> v;
g[u].push_back(v);
g[v].push_back(u);
deg[u]++;
deg[v]++;
}
vector<int> cnt(n + 5);
dep[1] = 1;
dfs(1, 0);
vector<int> son(n + 5);
for (int i = 1; i <= n; i++){
son[i] = deg[i] - (i != 1);
}
vector<int> vis(n + 5);
while (q--){
unordered_map<int, int> mp;
int tmp = 0;
int k;
cin >> k;
vector<int> b(k + 5);
for (int i = 1; i <= k; i++) cin >> b[i], vis[b[i]] = 1;
int flag = 0;
for (int i = 1; i <= k; i++){
cnt[b[i]]++;
if (cnt[b[i]] > 1) flag++;
}
for (int i = 1; i <= k; i++){
cnt[b[i]]--;
}
if (flag){
cout << "No" << endl;
continue;
}
vector< pair<int, int> > op[2];
for (int i = 1; i < k; i++){
int u = b[i], v = b[i + 1];
mp[u] = 1;
if (fenwick[1].query(in[u]) || fenwick[1].query(in[v])){
flag++;
break;
}
fenwick[0].add(in[u], 1);
op[0].emplace_back(in[u], 1);
// cout << "tmp = " << tmp << endl;
if (!son[u] && vis[u]){
tmp++;
}
// cout << "tmp = " << tmp << endl;
son[fa[u][0]]--;
if (!son[fa[u][0]] && vis[fa[u][0]]){
tmp++;
}
// cout << "tmp = " << tmp << endl;
// son[fa[v][0]]--;
// if (!son[fa[v][0]]){
// tmp++;
// }
if (dep[u] < dep[v]) {
if (u != fa[v][0]) {
flag++;
break;
}
}
else {
int l = lca(u, v);
if (!(u != 1 && deg[u] == 1 && l == fa[v][0])) {
flag++;
break;
}
int d = dep[u] - dep[l] - 1;
int x = getAnc(u, d);
if (mp.count(x)){
if (fenwick[0].querySeg(in[x], out[x]) != sz[x]){
flag++;
break;
}
}
else {
if (tmp != i) {
flag++;
break;
}
}
fenwick[1].modify(in[x], out[x], 1);
op[1].emplace_back(in[x], out[x]);
}
}
for (auto [lll, r] : op[0]){
fenwick[0].add(lll, -1);
}
for (auto [lll, r] : op[1]){
fenwick[1].modify(lll, r, -1);
}
for (int i = 1; i <= k; i++){
int pp = b[i];
son[pp] = deg[pp] - (pp != 1);
vis[pp] = 0;
pp = fa[b[i]][0];
son[pp] = deg[pp] - (pp != 1);
}
if (flag) cout << "No" << endl;
else cout << "Yes" << endl;
}
}
return 0;
}
/*
6 1
1 2
1 3
2 4
3 5
2 6
6 1 2 6 4 3 5
*/
/*
6 4
1 2
1 3
2 4
2 5
5 6
2 6 3
3 5 6 3
4 4 5 6 3
5 2 5 6 3 4
*/
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 10124kb
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: 36ms
memory: 13508kb
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 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 Yes Yes No No No No Yes No No No No No No No No No No No No No No No No No...
result:
wrong answer 46th words differ - expected: 'Yes', found: 'No'