Submission #916986

#	Time	Username	Problem	Language	Result	Execution time	Memory
916986		MilosMilutinovic	Sweeping (JOI20_sweeping)	C++14	0 / 100	255 ms	423124 KiB

sweeping

#include<bits/stdc++.h>
 
#define pb push_back
#define fi first
#define se second
#define mp make_pair
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef long double ld;
 
template <typename T> bool chkmin(T &x,T y){return x>y?x=y,1:0;}
template <typename T> bool chkmax(T &x,T y){return x<y?x=y,1:0;}
 
ll readint(){
	ll x=0,f=1; char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
	while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
	return x*f;
}

int n,m,q;
int v[1500005][2],fa[1500005],ch[1500005][2],tag[1500005][2],prior[1500005];
mt19937 rng(time(0));
 
void make(int id){ tag[id][0]=tag[id][1]=-1; prior[id]=rng(); fa[id]=ch[id][0]=ch[id][1]=0; }
 
void pushdown(int id){
	if(!id) return;
	for(int i=0;i<2;i++){
		if(tag[id][i]==-1) continue;
		for(int j=0;j<2;j++){
			if(ch[id][j]==0) continue;
			v[ch[id][j]][i]=tag[id][i];
			tag[ch[id][j]][i]=tag[id][i];
		}
		tag[id][i]=-1;
	}
}
 
void split(int id,int&l,int&r,int a,int b,int idx){
	if(!id) return (void)(l=r=0);
	pushdown(id);
	if(v[id][0]<=a&&v[id][1]<=b&&(mp(v[id][0],v[id][1])!=mp(a,b)||id<idx)){
		fa[ch[id][1]]=0;
		split(ch[id][1],ch[id][1],r,a,b,idx);
		l=id; 
		fa[ch[id][1]]=id;
	}else{
		fa[ch[id][0]]=0;
		split(ch[id][0],l,ch[id][0],a,b,idx);
		r=id;  
		fa[ch[id][0]]=id;
	}
}
 
void merge(int&id,int l,int r){
	if(!l) return (void)(id=r);
	if(!r) return (void)(id=l);
	pushdown(l);
	pushdown(r);
	if(prior[l]>prior[r]) swap(l,r);
	int L=0,R=0;
	split(l,L,R,v[r][0],v[r][1],r);
	fa[ch[r][0]]=0;
	fa[ch[r][1]]=0;
	merge(ch[r][0],ch[r][0],L);
	merge(ch[r][1],ch[r][1],R);
	fa[ch[r][0]]=r;
	fa[ch[r][1]]=r;
	id=r;
	pushdown(id);
}

namespace segtree{
	int root,tsz,ls[4000005],rs[4000005];
	multiset<pii> ids[4000005];
	pii mini[4000005];
	void modify(int&id,int l,int r,int i,pii v){
		if(!id) id=++tsz,mini[id]=mp(n+1,0);
		if(l==r) return (void)(mini[id]=v);
		int mid=(l+r)/2;
		if(i<=mid) modify(ls[id],l,mid,i,v);
		else modify(rs[id],mid+1,r,i,v);
		mini[id]=mp(n+1,0);
		if(ls[id]) mini[id]=min(mini[id],mini[ls[id]]);
		if(rs[id]) mini[id]=min(mini[id],mini[rs[id]]);
	}
	pii query(int id,int l,int r,int ql,int qr){
		if(!id||l>r||l>qr||r<ql) return mp(n+1,0);
		if(ql<=l&&r<=qr) return mini[id];
		int mid=(l+r)/2;
		return min(query(ls[id],l,mid,ql,qr),query(rs[id],mid+1,r,ql,qr));
	}
	void add(int x,int y,int i){
		ids[x].emplace(y,i);
		modify(root,0,n,x,*ids[x].begin());
	}
	void rem(int x,int y,int i){
		assert(ids[x].find(mp(y,i))!=ids[x].end());
		ids[x].erase(ids[x].find(mp(y,i)));
		modify(root,0,n,x,(ids[x].empty()?mp(n+1,0):*ids[x].begin()));
	}
	pii get(int l,int r){ return query(root,0,n,l,r); }
};

vector<int> find(int l){
	vector<int> ret;
	while(true){
		pii mn=segtree::get(0,l);
		if(mn.fi>n-l) break;
		int i=mn.se;
		segtree::rem(v[i][0],v[i][1],i);
		while(fa[i]) i=fa[i];
		ret.pb(i);
	}
	return ret;
}

int godown(int id){
	if(!ch[id][0]) return id;
	else return godown(ch[id][0]);
}
 
int main(){
	n=readint();
	m=readint();
	q=readint();
	for(int i=1;i<=m;i++) for(int j=0;j<2;j++) v[i][j]=readint();
	for(int i=1;i<=m;i++) make(i),segtree::add(v[i][0],v[i][1],i);
	while(q--){
		int t=readint();
		if(t==1){
			int i=readint();
			vector<int> anc;
			for(int v=i;v;v=fa[v]) anc.pb(v);
			reverse(anc.begin(),anc.end());
			for(int v:anc) pushdown(v);
			printf("%d %d\n",v[i][0],v[i][1]);
		}
		if(t==2){
			int l=readint();
			int root=0;
			vector<int> ids=find(n-l);
			for(int i:ids){
				int L=0,R=0;
				split(i,L,R,n-l,l,1e9);
				if(R!=0){
					int x=godown(R);
					vector<int> anc;
					for(int v=x;v;v=fa[v]) anc.pb(v);
					reverse(anc.begin(),anc.end());
					for(int v:anc) pushdown(v);
					segtree::add(v[x][0],v[x][1],x);
				}
				v[L][0]=n-l;
				tag[L][0]=n-l;
				pushdown(L);
				merge(root,root,L);
				pushdown(root);
			}
			if(root!=0){
				int x=godown(root);
				vector<int> anc;
				for(int v=x;v;v=fa[v]) anc.pb(v);
				reverse(anc.begin(),anc.end());
				for(int v:anc) pushdown(v);
				segtree::add(v[x][0],v[x][1],x);
			}
		}
		if(t==3){
			int l=readint();
			int root=0;
			vector<int> ids=find(l);
			for(int i:ids){
				int L=0,R=0;
				split(i,L,R,l,n-l,1e9);				
				if(R!=0){
					int x=godown(R);
					vector<int> anc;
					for(int v=x;v;v=fa[v]) anc.pb(v);
					reverse(anc.begin(),anc.end());
					for(int v:anc) pushdown(v);
					segtree::add(v[x][0],v[x][1],x);
				}
				v[L][1]=n-l;
				tag[L][1]=n-l;
				pushdown(L);
				pushdown(R);
				merge(root,root,L);
				pushdown(root);
			}
			if(root!=0){
				int x=godown(root);
				vector<int> anc;
				for(int v=x;v;v=fa[v]) anc.pb(v);
				reverse(anc.begin(),anc.end());
				for(int v:anc) pushdown(v);
				segtree::add(v[x][0],v[x][1],x);
			}
		}
		if(t==4){
			make(++m);
			for(int j=0;j<2;j++) v[m][j]=readint();
			segtree::add(v[m][0],v[m][1],m);	
		}
	}
	return 0;
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 10
• Subtask 3: 0 / 11
• Subtask 4: 0 / 53
• Subtask 5: 0 / 25