Submission #1161034

#	Time	Username	Problem	Language	Result	Execution time	Memory
1161034		mertbbm	Event Hopping 2 (JOI21_event2)	C++20	0 / 100	361 ms	39620 KiB

event2

#include <bits/stdc++.h>
using namespace std;
 
#define int long long 
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;
typedef pair<int,int>pii;
typedef pair<pii,int>pi2;
mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());

inline int combine(int a, int b){
	return max(a,b);
}

struct node{
	int s,e,m;
	node *l,*r;
	int v;
	
	node(int ss, int ee):s(ss),e(ee),m((s+e)>>1),v(1e15){
		if(s!=e){
			l=new node(s,m);
			r=new node(m+1,e);
		}
	}
	
	void upd(int x, int y){
		if(s==e){
			v=y;
			return;
		}
		if(x<=m) l->upd(x,y);
		else r->upd(x,y);
		v=combine(l->v,r->v);
	}
	
	int query(int x, int y){
		if(x<=s&&y>=e){
			return v;
		}
		if(y<=m) return l->query(x,y);
		if(x>m) return r->query(x,y);
		return combine(l->query(x,m),r->query(m+1,y));
	}
}*root;

bool cmp(const pii a, const pii b){
	return a.second < b.second;
}

int two[20][200005];
pii arr2[100005];
int n,k;

int f(int st, int rgt){
	if(st>rgt) return 0;
	int l=0;
	int r=n-1;
	int best=n;
	int mid;
	
	while(l<=r){
		mid=(l+r)/2;
		int hold=root->query(0,mid);
		if(hold>=st){
			best=mid;
			r=mid-1;
		}
		else l=mid+1;
	}
	st=best;
	
	int ans=arr2[st].second<=rgt;
	for(int y=18;y>=0;y--){
		if(two[y][st]==0) continue;
		if(arr2[two[y][st]].second<=rgt){
			st=two[y][st];
			ans+=1<<y;
		}
	}
	return ans;
}

void solve(){
	cin >> n >> k;
	
	pii arr[n];
	vector<int>dis;
	for(int x=0;x<n;x++){
		cin >> arr[x].first >> arr[x].second;
		dis.push_back(arr[x].first);
		dis.push_back(arr[x].second);
	}
	
	sort(dis.begin(),dis.end());
	dis.resize(unique(dis.begin(),dis.end())-dis.begin());
	
	for(int x=0;x<n;x++){
		arr[x].first=lower_bound(dis.begin(),dis.end(),arr[x].first)-dis.begin()+1;
		arr[x].second=lower_bound(dis.begin(),dis.end(),arr[x].second)-dis.begin()+1;
		arr2[x]=arr[x];
	}
	
	sort(arr2,arr2+n,cmp);

	root=new node(0,n+5);
	
	for(int x=0;x<n;x++){
		root->upd(x,arr2[x].first);
	}
	
	for(int x=n-1;x>=0;x--){
		int l=0;
		int r=n-1;
		int best=n;
		int mid;
		while(l<=r){
			mid=(l+r)/2;
			int hold=root->query(0,mid);
			if(hold>=arr2[x].second){
				best=mid;
				r=mid-1;
			}
			else l=mid+1;
		}
		
		if(best!=n){
			two[0][x]=best;
			for(int y=0;y<18;y++){
				two[y+1][x]=two[y][two[y][x]];
			}
		}
	}
	
	set<pair<pii,int>>se;
	
	int counter=f(1,2*n);
	
	if(counter<k){
		cout << -1;
		return;
	}
	
	se.insert({{1,2*n},counter});
	
	vector<int>v;
	
	for(int x=0;x<n;x++){
		auto it=se.upper_bound({{arr[x].first,1e15},1e15});
		if(it==se.begin()) continue;
		it--;
		pair<pii,int>hold=*it;
		if(hold.first.first>arr[x].first || hold.first.second<arr[x].second) continue;
		int a=f(hold.first.first,arr[x].first);
		int b=f(arr[x].second,hold.first.second);
		if(counter-hold.second+a+b+1>=k){
			se.erase(se.find(hold));
			if(hold.first.first<arr[x].first){
				se.insert({{hold.first.first,arr[x].first},a});
			}
			if(arr[x].second<hold.first.second){
				se.insert({{arr[x].second,hold.first.second},b});
			}
			v.push_back(x+1);
			counter=counter-hold.second+a+b+1;
		}	 
	}
	
	for(int x=0;x<k;x++) cout << v[x] << "\n";
}
 
int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	//freopen("lineup.in","r",stdin);
	//freopen("lineup.out","w",stdout);
	int t=1;	
	//cin >> t;	
	while(t--){
		solve(); 
	}
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 1
• Subtask 3: 0 / 31
• Subtask 4: 0 / 61