結果
| 問題 |
No.1216 灯籠流し/Lanterns
|
| コンテスト | |
| ユーザー |
beet
|
| 提出日時 | 2020-09-01 22:41:26 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 1,293 ms / 4,500 ms |
| コード長 | 8,903 bytes |
| コンパイル時間 | 3,767 ms |
| コンパイル使用メモリ | 246,516 KB |
| 最終ジャッジ日時 | 2025-01-14 03:18:39 |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 48 |
ソースコード
#define PROBLEM "https://yukicoder.me/problems/4852"
#include<bits/stdc++.h>
using namespace std;
#define call_from_test
#ifndef call_from_test
#include<bits/stdc++.h>
using namespace std;
#endif
/*
* @docs docs/binaryindexedtree.md
*/
//BEGIN CUT HERE
template<typename T>
struct BIT{
int n;
vector<T> bit;
// 1-indexed
BIT(int n_):n(n_+1),bit(n+1,0){}
T sum(int i){
T s(0);
for(int x=i;x>0;x-=(x&-x))
s+=bit[x];
return s;
}
void add(int i,T a){
if(i==0) return;
for(int x=i;x<=n;x+=(x&-x))
bit[x]+=a;
}
// [l, r)
T query(int l,int r){
return sum(r-1)-sum(l-1);
}
int lower_bound(int w){
if(w<=0) return 0;
int x=0,r=1;
while(r<n) r<<=1;
for(int k=r;k>0;k>>=1){
if(x+k<=n&&bit[x+k]<w){
w-=bit[x+k];
x+=k;
}
}
return x+1;
}
// 0-indexed
T sum0(int i){return sum(i+1);}
void add0(int i,T a){add(i+1,a);}
T query0(int l,int r){return sum(r)-sum(l);}
};
//END CUT HERE
#ifndef call_from_test
signed main(){
return 0;
}
#endif
#ifndef call_from_test
#include <bits/stdc++.h>
using namespace std;
#endif
//BEGIN CUT HERE
template<typename TV, const int N> void read_tuple_impl(TV&) {}
template<typename TV, const int N, typename Head, typename... Tail>
void read_tuple_impl(TV& ts) {
get<N>(ts).emplace_back(*(istream_iterator<Head>(cin)));
read_tuple_impl<TV, N+1, Tail...>(ts);
}
template<typename... Ts> decltype(auto) read_tuple(size_t n) {
tuple<vector<Ts>...> ts;
for(size_t i=0;i<n;i++) read_tuple_impl<decltype(ts), 0, Ts...>(ts);
return ts;
}
//END CUT HERE
#ifndef call_from_test
signed main(){
return 0;
}
#endif
#ifndef call_from_test
#include<bits/stdc++.h>
using namespace std;
#endif
//BEGIN CUT HERE
template<typename F>
struct FixPoint : F{
FixPoint(F&& f):F(forward<F>(f)){}
template<typename... Args>
decltype(auto) operator()(Args&&... args) const{
return F::operator()(*this,forward<Args>(args)...);
}
};
template<typename F>
inline decltype(auto) MFP(F&& f){
return FixPoint<F>{forward<F>(f)};
}
//END CUT HERE
#ifndef call_from_test
//INSERT ABOVE HERE
signed main(){
return 0;
}
#endif
#ifndef call_from_test
#include<bits/stdc++.h>
using namespace std;
#endif
//BEGIN CUT HERE
class EulerTourForVertex{
private:
vector<int> ls,rs;
int pos;
void dfs(int v,int p){
ls[v]=pos++;
for(int u:G[v])
if(u!=p) dfs(u,v);
rs[v]=pos;
}
public:
vector< vector<int> > G;
EulerTourForVertex(){}
EulerTourForVertex(int n):ls(n),rs(n),G(n){}
void add_edge(int u,int v){
G[u].emplace_back(v);
G[v].emplace_back(u);
}
void build(int r=0){
pos=0;
dfs(r,-1);
}
int idx(int v){return ls[v];}
template<typename F>
void exec(int v,F f){
f(ls[v],rs[v]);
}
};
//END CUT HERE
#ifndef call_from_test
signed main(){
return 0;
}
#endif
#ifndef call_from_test
#include<bits/stdc++.h>
using namespace std;
#endif
//BEGIN CUT HERE
struct LowestCommonAncestor{
int n,h;
vector< vector<int> > G,par;
vector<int> dep;
LowestCommonAncestor(){}
LowestCommonAncestor(int n):n(n),G(n),dep(n){
h=1;
while((1<<h)<=n) h++;
par.assign(h,vector<int>(n,-1));
}
void add_edge(int u,int v){
G[u].emplace_back(v);
G[v].emplace_back(u);
}
void dfs(int v,int p,int d){
par[0][v]=p;
dep[v]=d;
for(int u:G[v])
if(u!=p) dfs(u,v,d+1);
}
void build(int r=0){
dfs(r,-1,0);
for(int k=0;k+1<h;k++)
for(int v=0;v<n;v++)
if(~par[k][v])
par[k+1][v]=par[k][par[k][v]];
}
int lca(int u,int v){
if(dep[u]>dep[v]) swap(u,v);
for(int k=0;k<h;k++)
if((dep[v]-dep[u])>>k&1)
v=par[k][v];
if(u==v) return u;
for(int k=h-1;k>=0;k--)
if(par[k][u]!=par[k][v])
u=par[k][u],v=par[k][v];
return par[0][u];
}
int distance(int u,int v){
return dep[u]+dep[v]-dep[lca(u,v)]*2;
}
};
//END CUT HERE
#ifndef call_from_test
signed main(){
return 0;
}
#endif
#ifndef call_from_test
#include<bits/stdc++.h>
using namespace std;
#define call_from_test
#include "eulertourforvertex.cpp"
#include "lowestcommonancestor.cpp"
#undef call_from_test
#endif
/**
* @see https://smijake3.hatenablog.com/entry/2019/09/15/200200
*/
//BEGIN CUT HERE
struct AuxiliaryTree : EulerTourForVertex{
using super = EulerTourForVertex;
LowestCommonAncestor lca;
vector<vector<int>> T;
AuxiliaryTree(){}
AuxiliaryTree(int n):super(n),lca(n),T(n){}
void build(int r=0){
super::build(r);
lca.G=super::G;
lca.build(r);
}
void add_aux_edge(int u,int v){
T[u].emplace_back(v);
T[v].emplace_back(u);
}
using super::idx;
void query(vector<int> &vs){
assert(!vs.empty());
sort(vs.begin(),vs.end(),
[&](int a,int b){return idx(a)<idx(b);});
vs.erase(unique(vs.begin(),vs.end()),vs.end());
int k=vs.size();
stack<int> st;
st.emplace(vs[0]);
for(int i=0;i+1<k;i++){
int w=lca.lca(vs[i],vs[i+1]);
if(w!=vs[i]){
int l=st.top();st.pop();
while(!st.empty()&&lca.dep[w]<lca.dep[st.top()]){
add_aux_edge(st.top(),l);
l=st.top();st.pop();
}
if(st.empty()||st.top()!=w){
st.emplace(w);
vs.emplace_back(w);
}
add_aux_edge(w,l);
}
st.emplace(vs[i+1]);
}
while(st.size()>1){
int c=st.top();st.pop();
add_aux_edge(st.top(),c);
}
}
void clear(const vector<int> &ws){
for(int w:ws) T[w].clear();
}
};
//END CUT HERE
#ifndef call_from_test
signed main(){
return 0;
}
#endif
#ifndef call_from_test
#include <bits/stdc++.h>
using namespace std;
#endif
//BEGIN CUT HERE
template<typename V>
V compress(V vs){
sort(vs.begin(),vs.end());
vs.erase(unique(vs.begin(),vs.end()),vs.end());
return vs;
}
template<typename T>
map<T, int> dict(const vector<T> &vs){
map<T, int> res;
for(int i=0;i<(int)vs.size();i++)
res[vs[i]]=i;
return res;
}
map<char, int> dict(const string &s){
return dict(vector<char>(s.begin(),s.end()));
}
//END CUT HERE
#ifndef call_from_test
//INSERT ABOVE HERE
signed main(){
return 0;
}
#endif
#undef call_from_test
#ifdef SANITIZE
#define IGNORE
#endif
signed main(){
cin.tie(0);
ios::sync_with_stdio(0);
const char newl = '\n';
using ll = long long;
using P = pair<int, ll>;
int n,q;
cin>>n>>q;
vector<vector<P>> G(n+1);
AuxiliaryTree H(n+1);
for(int i=1;i<n;i++){
int a,b;
ll c;
cin>>a>>b>>c;
G[a].emplace_back(b,c);
G[b].emplace_back(a,c);
H.add_edge(a,b);
}
// add 0 for root
H.add_edge(0,1);
H.build(0);
const ll INF = 1e15;
G[0].emplace_back(1,INF);
vector<ll> dep(n+1);
MFP([&](auto dfs,int v,int p,ll d)->void{
dep[v]=d;
for(auto [u,c]:G[v])
if(u!=p) dfs(u,v,d+c);
})(0,-1,0);
auto [type,vs,ts,ls]=read_tuple<int, int, ll, ll>(q);
// vanish vertices
vector<int> rs(q);
for(int i=0;i<q;i++){
if(type[i]!=0) continue;
int r=vs[i];
ll d=dep[vs[i]]-ls[i];
for(int k=H.lca.h-1;k>=0;k--){
int p=H.lca.par[k][r];
if(~p and d<=dep[p]) r=p;
}
rs[i]=H.lca.par[0][r];
}
vector<ll> pos;
for(int i=0;i<q;i++)
pos.emplace_back(ts[i]+dep[vs[i]]);
pos=compress(pos);
BIT<int> bit(pos.size());
vector<int> cs(q);
for(int i=0;i<q;i++)
cs[i]=lower_bound(pos.begin(),pos.end(),ts[i]+dep[vs[i]])-pos.begin();
queue<P> que;
que.emplace(0,q);
vector<int> ans(q);
vector<vector<int>> add(n+1),sub(n+1),query(n+1);
while(!que.empty()){
auto [L,R]=que.front();que.pop();
if(L+1==R) continue;
int M=(L+R)>>1;
vector<int> ss;
for(int i=L;i<M;i++){
if(type[i]==0){
ss.emplace_back(vs[i]);
ss.emplace_back(rs[i]);
}
}
for(int i=M;i<R;i++)
if(type[i]==1) ss.emplace_back(vs[i]);
if(ss.empty()){
que.emplace(L,M);
que.emplace(M,R);
continue;
}
ss.emplace_back(0);
H.query(ss);
for(int i=L;i<M;i++){
if(type[i]==0){
add[vs[i]].emplace_back(i);
sub[rs[i]].emplace_back(i);
}
}
for(int i=M;i<R;i++)
if(type[i]==1) query[vs[i]].emplace_back(i);
auto expand=[&](int v){
for(int i:add[v]) bit.add0(cs[i],+1);
for(int i:sub[v]) bit.add0(cs[i],-1);
};
MFP([&](auto dfs,int v,int p)->void{
for(int i:query[v])
ans[i]-=bit.sum0(cs[i]);
for(int u:H.T[v])
if(u!=p) dfs(u,v);
expand(v);
for(int i:query[v])
ans[i]+=bit.sum0(cs[i]);
})(0,-1);
H.clear(ss);
for(int i=L;i<M;i++){
if(type[i]==0){
add[vs[i]].clear();
sub[rs[i]].clear();
}
}
for(int i=M;i<R;i++)
if(type[i]==1) query[vs[i]].clear();
que.emplace(L,M);
que.emplace(M,R);
}
for(int i=0;i<q;i++)
if(type[i]==1) cout<<ans[i]<<newl;
return 0;
}
beet