Submission #377678

#	Time	Username	Problem	Language	Result	Execution time	Memory
377678		YJU	Collapse (JOI18_collapse)	C++14	100 / 100	7530 ms	24576 KiB

collapse

#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector,Ofast")
using namespace std;
typedef int ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll N=1e5+5;
const ll K=sqrt(N);
const ll MOD2=998244353;
const ld pi=acos(-1);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()
 
ll sz[N],dir[N],now,stk[N][2],cnt;
 
ll find(ll id){
	while(id!=dir[id])id=dir[id];
	return id;
}
 
void Union(ll nda,ll ndb){
	nda=find(nda);ndb=find(ndb);
	if(nda==ndb)return ;
	if(sz[nda]>sz[ndb])swap(nda,ndb);
	++now;
	stk[now][0]=nda;stk[now][1]=ndb;
	sz[ndb]+=sz[nda];
	dir[nda]=ndb;
}
 
void restore(ll T){
	while(now>T){
		ll nda=stk[now][0],ndb=stk[now][1];
		sz[ndb]-=sz[nda];
		dir[nda]=nda;
		--now;
	}
}
 
set<pll> Edge,init;
ll n,q,c;
ll ty[N],x[N],y[N],w[N],p[N],ans[N];
vector<pll> oper,query;
vector<ll> Q[N];
map<pll,ll> mm;

ll se1[N],se2[N],num[N];
 
void solve(){
	//reset
	now=cnt=0;
	REP1(i,n)sz[i]=1,dir[i]=i;
	
	for(ll start=0;start<c;start+=K){
		/**/
		//memset(se1,0,sizeof(se1));
		init.clear();
		oper.clear();
		query.clear();
		/**/
		for(ll i=0;i<start;i++){
			if(ty[i]==0){
				se1[num[i]]=1;
				//Edge.insert(mp(x[i],y[i]));
			}else{
				se1[num[i]]=0;
			}
		}
		for(ll i=start;i<min(c,start+K);i++){
			if(ty[i]==1&&se1[num[i]]==1){
				se1[num[i]]=0;
				init.insert(mp(x[i],y[i]));
			}
			for(ll j:Q[i]){
				query.pb(mp(p[j],j));
			}
		}
		REP(i,c){
			if(se1[i]){
				se1[i]=0;
				oper.pb(mp(y[i],x[i]));
			}
		}
		sort(oper.begin(),oper.end());
		sort(query.begin(),query.end());
		for(ll i=0,j=0;i<SZ(query);i++){
			while(j<SZ(oper)&&oper[j].X<=query[i].X)Union(oper[j].X,oper[j].Y),++j;
			ll pos=now,qid=query[i].Y;
			set<pll> tmp=init;
			for(ll ii=start;ii<w[qid]+1;ii++){
				if(ty[ii]==1)tmp.erase(mp(x[ii],y[ii]));
				else tmp.insert(mp(x[ii],y[ii]));
			}
			for(pll ii:tmp){
				if(ii.Y<=query[i].X)Union(ii.X,ii.Y);
			}
			ans[qid]+=query[i].X-now;
			restore(pos);
		}
		restore(0);
	}
}
 
void rev(){
	REP(i,c){
		ll xx=x[i],yy=y[i];
		x[i]=n+1-yy;
		y[i]=n+1-xx;
	}
	REP(i,q){
		p[i]=n-p[i];
	}
}
 
vector<ll> simulateCollapse(ll _n,vector<ll> _ty,vector<ll> _x,vector<ll> _y,vector<ll> _w,vector<ll> _p){
	n=_n;q=SZ(_w);c=SZ(_ty);
	REP(i,c){
		ty[i]=_ty[i];x[i]=_x[i]+1;y[i]=_y[i]+1;
		if(x[i]>y[i])swap(x[i],y[i]);
		if(mm.find(mp(x[i],y[i]))==mm.end()){
			num[i]=mm[mp(x[i],y[i])]=i;
		}else{
			num[i]=mm[mp(x[i],y[i])];
		}
	}
	REP(i,q){p[i]=_p[i]+1;w[i]=_w[i];}
	REP(i,q)Q[w[i]].pb(i);
	solve();
	rev();
	solve();
	
	vector<ll> ret;
	REP(i,q)ret.pb(ans[i]);
	return ret;
}
/*
int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	vector<ll> T={0,0,0,0,0,0,1,0};
	vector<ll> TX={0,0,1,2,4,4,4,4};
	vector<ll> TY={1,3,2,4,0,3,3,3};
	vector<ll> W={7};
	vector<ll> P={3};
	vector<ll> ans=simulateCollapse(5,T,TX,TY,W,P);
	for(auto i:ans)cout<<i<<"\n";
	return 0;
}
 
//*/

• Subtask 1: 5 / 5
• Subtask 2: 30 / 30
• Subtask 3: 30 / 30
• Subtask 4: 35 / 35