結果
| 問題 |
No.3103 Butterfly Effect
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2025-04-11 23:29:03 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 6,342 bytes |
| コンパイル時間 | 4,736 ms |
| コンパイル使用メモリ | 274,236 KB |
| 実行使用メモリ | 95,384 KB |
| 最終ジャッジ日時 | 2025-04-11 23:29:38 |
| 合計ジャッジ時間 | 27,506 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 1 |
| other | AC * 38 WA * 12 |
ソースコード
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
template <class S, S (*op)(S, S), S (*e)()> class LinkCutTree {
struct Node {
Node *l, *r, *p;
int id;
S key, fsum, bsum;
bool rev;
explicit Node(const S &v) : key(v), fsum(v), bsum(v), rev(false), l(nullptr), r(nullptr), p(nullptr) {}
bool is_root() const { return not p or (p->l != this and p->r != this); }
};
void update(Node* t) {
t->fsum = t->key;
t->bsum = t->key;
if(t->l) {
t->fsum = op(t->l->fsum, t->fsum);
t->bsum = op(t->bsum, t->l->bsum);
}
if(t->r) {
t->fsum = op(t->fsum, t->r->fsum);
t->bsum = op(t->r->bsum, t->bsum);
}
}
void rotate_right(Node* t) {
Node *x = t->p, *y = x->p;
if((x->l = t->r)) t->r->p = x;
t->r = x, x->p = t;
update(x), update(t);
if((t->p = y)) {
if(y->l == x) y->l = t;
if(y->r == x) y->r = t;
update(y);
}
}
void rotate_left(Node* t) {
Node *x = t->p, *y = x->p;
if((x->r = t->l)) t->l->p = x;
t->l = x, x->p = t;
update(x), update(t);
if((t->p = y)) {
if(y->l == x) y->l = t;
if(y->r == x) y->r = t;
update(y);
}
}
void toggle(Node* t) {
std::swap(t->l, t->r);
std::swap(t->fsum, t->bsum);
t->rev ^= true;
}
void push(Node* t) {
if(t->rev) {
if(t->l) toggle(t->l);
if(t->r) toggle(t->r);
t->rev = false;
}
}
void splay(Node *t) {
push(t);
while(not t->is_root()) {
Node* q = t->p;
if(q->is_root()) {
push(q), push(t);
q->l == t ? rotate_right(t) : rotate_left(t);
} else {
Node* r = q->p;
push(r), push(q), push(t);
if(r->l == q) {
if(q->l == t) rotate_right(q), rotate_right(t);
else rotate_left(t), rotate_right(t);
} else {
if(q->r == t) rotate_left(q), rotate_left(t);
else rotate_right(t), rotate_left(t);
}
}
}
}
int N;
public:
std::vector<Node*> Node_info;
LinkCutTree(int n) : LinkCutTree(std::vector<S>(n, e())) {}
LinkCutTree(const std::vector<S> &vec) : N(vec.size()), Node_info(vec.size()){
for(int i = 0; i < N; i++) {
Node_info[i] = new Node(vec[i]);
Node_info[i]->id = i;
}
}
int expose(int v) {
Node* t = Node_info[v];
Node* rp = nullptr;
for(Node* cur = t; cur; cur = cur->p) {
splay(cur);
cur->r = rp;
update(cur);
rp = cur;
}
splay(t);
return rp->id;
}
void evert(int v) {
expose(v);
toggle(Node_info[v]);
push(Node_info[v]);
}
void link(int child_id, int parent_id) {
Node *child = Node_info[child_id], *parent = Node_info[parent_id];
evert(child_id);
expose(parent_id);
if(child_id == parent_id || child->p) {
throw std::runtime_error("child and parent must be different connected components");
}
child->p = parent;
parent->r = child;
update(parent);
}
void cut(int child_id) {
Node *child = Node_info[child_id];
expose(child_id);
auto *parent = child->l;
child->l = nullptr;
parent->p = nullptr;
}
void cut(int child_id, int parent_id){
evert(parent_id);
expose(child_id);
while(Node_info[child_id]->l){
Node* child = Node_info[child_id];
Node* parent = child->l;
child->l = nullptr;
parent->p = nullptr;
update(child);
child_id = parent->id;
}
}
bool same(int u, int v) {
expose(u), expose(v);
return u == v or Node_info[u]->p;
}
int lca(int u, int v) {
if(u == v) return u;
expose(u);
int lcav = expose(v);
if(not Node_info[u]->p) return -1;
return lcav;
}
const S &query(int u, int v) {
evert(u);
expose(v);
return Node_info[v]->fsum;
}
void set(int pos, S v) {
expose(pos);
Node_info[pos]->key = v;
update(Node_info[pos]);
}
};
using S = pair<int,int>;
S op(S lhs, S rhs){
return max(lhs, rhs);
}
S e(){
return make_pair(0, 0);
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
int n, q;
cin >> n >> q;
vector<tuple<int,int,int,int>> edge(q);
vector<tuple<int,int,int>> tb(q);
for(int i = 0; i < q; i++){
auto &&[t, u, v, idx] = edge[i];
cin >> t >> u >> v;
t--, u--, v--;
idx = i;
tb[t] = make_tuple(u, v, idx);
}
atcoder::dsu uf1(n);
LinkCutTree<S, op, e> lct(n + q);
int cur = n;
vector<vector<pair<int,int>>> add(q);
for(int i = 0; i < q; i++){
auto [u, v, idx] = tb[i];
//cerr << u << " " << v << '\n';
if(uf1.same(u, v)){
auto w = lct.query(u, v);
if(w.first < idx) continue;
lct.cut(w.second);
lct.set(cur, make_pair(idx, cur));
lct.link(u, cur);
lct.link(v, cur);
cur++;
add[idx].emplace_back(u, v);
continue;
}
if(!uf1.same(0, u) && !uf1.same(0, v)) continue;
if(uf1.same(0, u)){
auto w = lct.query(0, u);
//cerr << max(w.first, idx) << " " << u << " " << v << endl;
add[max(w.first, idx)].emplace_back(u, v);
}else{
auto w = lct.query(0, v);
//cerr << max(w.first, idx) << " " << u << " " << v << endl;
add[max(w.first, idx)].emplace_back(u, v);
}
uf1.merge(u, v);
lct.set(cur, make_pair(idx, cur));
lct.link(u, cur);
lct.link(v, cur);
cur++;
}
atcoder::dsu uf(n);
for(int i = 0; i < q; i++){
for(auto [u, v] : add[i]) uf.merge(u, v);
cout << uf.size(0) << '\n';
}
}