結果
| 問題 |
No.2800 Game on Tree Inverse
|
| コンテスト | |
| ユーザー |
noya2
|
| 提出日時 | 2024-06-09 02:15:30 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 779 ms / 4,000 ms |
| コード長 | 5,161 bytes |
| コンパイル時間 | 3,813 ms |
| コンパイル使用メモリ | 258,756 KB |
| 実行使用メモリ | 216,460 KB |
| 最終ジャッジ日時 | 2024-12-29 01:25:43 |
| 合計ジャッジ時間 | 34,056 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 64 |
ソースコード
#include<bits/stdc++.h>
#define all(v) (v).begin(),(v).end()
using namespace std;
template <typename T, typename U> inline bool chmax(T &x, U y) { return (x < y) ? (x = y, true) : false; }
template<typename T, int LOG>
struct binary_trie {
struct node {
node *p;
array<node*,2> ch;
int leaf, sz;
node () : p(nullptr), ch({nullptr,nullptr}), leaf(0), sz(0) {}
};
binary_trie () : lazy(0) {}
int size(node *v){
if (v == nullptr) return 0;
return v->sz;
}
int size(){
return size(root);
}
void insert(T x){
x ^= lazy;
node *v = root;
for (int i = LOG-1; i >= 0; i--){
int j = x >> i & 1;
if (v->ch[j] == nullptr){
v->ch[j] = new node();
v->ch[j]->p = v;
}
v = v->ch[j];
}
v->leaf = 1;
update(v);
for (int i = 0; i < LOG; i++){
v = v->p;
update(v);
}
}
void erase(T x){
x ^= lazy;
node *v = root;
for (int i = LOG-1; i >= 0; i--){
int j = x >> i & 1;
if (v->ch[j] == nullptr) return ;
v = v->ch[j];
}
v->leaf = 0;
update(v);
for (int i = 0; i < LOG; i++){
node *p = v->p;
if (size(v) == 0){
(v == p->ch[0] ? p->ch[0] : p->ch[1]) = nullptr;
delete v;
}
v = p;
update(v);
}
}
int count(T x){
node *v = root;
int res = 0;
for (int i = LOG-1; i >= 0; i--){
int j = lazy >> i & 1;
if (x >> i & 1){
res += size(v->ch[j]);
v = v->ch[j^1];
}
else {
v = v->ch[j];
}
if (v == nullptr) break;
}
return res;
}
T get(int k){
if (k < 0 || k >= size()) return -1;
node *v = root;
T ans = 0;
for (int i = LOG-1; i >= 0; i--){
int j = lazy >> i & 1;
if (k < size(v->ch[j])){
v = v->ch[j];
}
else {
k -= size(v->ch[j]);
v = v->ch[j^1];
ans |= T(1) << i;
}
}
return ans;
}
T mex(){
if ((T)size() == (T(1)<<LOG)) return T(1)<<LOG;
node *v = root;
T ans = 0;
for (int i = LOG-1; i >= 0; i--){
int j = lazy >> i & 1;
if ((T)size(v->ch[j]) < (T(1)<<i)){
v = v->ch[j];
}
else {
v = v->ch[j^1];
ans |= T(1) << i;
}
if (v == nullptr) break;
}
return ans;
}
T xor_all(T x){ return lazy ^= x; }
vector<T> enumerate(){
vector<T> ans; ans.reserve(size());
auto dfs = [&](auto sfs, int i, T x, node *v) -> void {
if (i == -1){
ans.emplace_back(x^lazy);
return ;
}
if (v->ch[0] != nullptr){
sfs(sfs,i-1,x,v->ch[0]);
}
if (v->ch[1] != nullptr){
sfs(sfs,i-1,x|(T(1)<<i),v->ch[1]);
}
};
dfs(dfs,LOG-1,0,root);
return ans;
}
private:
T lazy;
node *root = new node();
void update(node *v){
v->sz = v->leaf + size(v->ch[0]) + size(v->ch[1]);
}
};
int main(){
int n; cin >> n;
vector<vector<int>> g(n);
for (int i = 0; i < n-1; i++){
int u, v; cin >> u >> v; u--, v--;
g[u].emplace_back(v);
g[v].emplace_back(u);
}
vector<binary_trie<int,20>> bts(n);
vector<int> dp(n);
auto dfs = [&](auto sfs, int v, int f) -> int {
vector<int> ids;
for (auto u : g[v]){
if (u == f) continue;
ids.emplace_back(sfs(sfs,u,v));
}
int ma = -1, id = v;
int gr = 0;
for (int i : ids){
if (chmax(ma,bts[i].size())){
id = i;
}
gr ^= bts[i].mex();
}
for (int i : ids){
bts[i].xor_all(bts[i].mex()^gr);
}
for (int i : ids){
if (i == id) continue;
for (int x : bts[i].enumerate()){
bts[id].insert(x);
}
}
bts[id].insert(bts[id].mex()); // bts[id].mex() == gr
dp[v] = bts[id].mex();
return id;
};
dfs(dfs,0,-1);
vector<int> vec;
auto win = [&](auto sfs, int v, int f, int x) -> void {
int c = 0;
for (int u : g[v]){
if (u == f) continue;
c ^= dp[u];
}
if (c == x){
vec.emplace_back(v);
}
for (int u : g[v]){
if (u == f) continue;
sfs(sfs,u,v,x^c^dp[u]);
}
};
win(win,0,-1,0);
sort(all(vec));
cout << "Alice" << endl;
cout << vec.size() << endl;
for (int x : vec){
if (x != vec[0]){
cout << ' ';
}
cout << x+1;
}
cout << endl;
}
noya2