Submission #921578

#	Time	Username	Problem	Language	Result	Execution time	Memory
921578		LCJLY	Street Lamps (APIO19_street_lamps)	C++14	20 / 100	1921 ms	524288 KiB

street_lamps

#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;

int fw[300005];
void update(int x, int v) {
    for (; x<300005; x+=x&(-x)) fw[x] += v; 
}
int sum(int x) {
    int res = 0;
    for(; x; x-=x&(-x)) res += fw[x];
    return res;
}

int query(int x, int y){
	return sum(y)-sum(x-1);	
}

int n,q;
string s;
int ans[300005];
typedef pair<pii,pii>pi2;

vector<pi2>storage[300005];
vector<pi2>que[300005];
vector<pii>undo;

void dnc(int l, int r){
	if(r<=l){
		sort(storage[l].begin(),storage[l].end());
		sort(que[l].begin(),que[l].end());
		return;
	}
	vector<pi2>lstorage;
	vector<pi2>lque;
	int mid=(l+r)/2;
	
	for(auto it:storage[l]){
		if(it.second.first<=mid&&it.second.second>mid){
			lstorage.push_back({it.first,{it.second.first,mid}});
			storage[mid+1].push_back({it.first,{mid+1,it.second.second}});
		}
		else if(it.second.second<=mid){
			lstorage.push_back(it);
		}
		else if(it.second.first>mid){
			storage[mid+1].push_back(it);
		}
	}
	for(auto it:que[l]){
		if(it.second.first<=mid){
			lque.push_back(it);
		}
		else que[mid+1].push_back(it);
	}
	
	storage[l]=lstorage;
	que[l]=lque;
	lstorage.clear();
	lque.clear();
	dnc(l,mid);
	dnc(mid+1,r);
	
	vector<pi2>hold;
	vector<pi2>hold2;
	
	int cur=0;
	
	for(auto it:que[mid+1]){
		int lft=it.first.first;
		int rgt=it.first.second;
		int index=it.second.second;
		while(cur<(int)storage[l].size()){
			if(storage[l][cur].first.first<=lft){
				int val=storage[l][cur].second.second-storage[l][cur].second.first+1;
				update(storage[l][cur].first.second,val);
				undo.push_back({storage[l][cur].first.second,-val});
				cur++;
			}
			else{
				break;
			}
		}
		ans[index]+=query(rgt,n);
	}
	
	for(auto it:undo){
		update(it.first,it.second);
	}
	
	undo.clear();
	merge(storage[l].begin(),storage[l].end(),storage[mid+1].begin(),storage[mid+1].end(),back_inserter(hold));
	merge(que[l].begin(),que[l].end(),que[mid+1].begin(),que[mid+1].end(),back_inserter(hold2));
	storage[l].clear();
	storage[mid+1].clear();
	que[l].clear();
	que[mid+1].clear();
	storage[l]=hold;
	que[l]=hold2;
	hold.clear();
	hold2.clear();
}

void solve(){
	cin >> n >> q;
	cin >> s;
	s="0"+s+"0";
	
	string temp;
	int l,r;
	int ptr=0;
	set<pair<pii,int>>se;
	
	for(int x=1;x<=n;x++){
		if(s[x]=='1'){
			int cur=x;
			for(int y=x;y<=n;y++){
				if(s[y]=='0') break;
				cur=y;
			}
			se.insert({{cur,x},0LL});
			x=cur;
		}
	}
	for(int x=1;x<=q;x++){
		cin >> temp;
		if(temp=="toggle"){
			cin >> l;
			if(s[l]=='1'){
				//turn off
				auto it=se.lower_bound({{l,0LL},0LL});
				pair<pii,int>hold=*it;
				storage[0].push_back({{hold.first.second,hold.first.first},{hold.second,x-1}});
				if(hold.first.second<l){
					se.insert({{l-1,hold.first.second},x});
				}
				if(hold.first.first>l){
					se.insert({{hold.first.first,l+1},x});
				}
				se.erase(se.find(hold));
				s[l]='0';
			}
			else{
				//turn on
				if(s[l-1]=='1'&&s[l+1]=='1'){
					auto it=se.lower_bound({{l,0LL},0LL});
					pair<pii,int>hold,hold2;
					hold=*it;
					it--;
					hold2=*it;
					storage[0].push_back({{hold.first.second,hold.first.first},{hold.second,x-1}});
					
					storage[0].push_back({{hold2.first.second,hold2.first.first},{hold2.second,x-1}});
					se.insert({{hold.first.first,hold2.first.second},x});
					se.erase(se.find(hold));
					se.erase(se.find(hold2));
				}
				else if(s[l-1]=='1'){
					auto it=se.lower_bound({{l,0LL},0LL});
					it--;
					pair<pii,int>hold=*it;
					storage[0].push_back({{hold.first.second,hold.first.first},{hold.second,x-1}});
					se.insert({{l,hold.first.second},x});
					se.erase(se.find(hold));
				}
				else if(s[l+1]=='1'){
					auto it=se.lower_bound({{l,0LL},0LL});
					pair<pii,int>hold=*it;
					storage[0].push_back({{hold.first.second,hold.first.first},{hold.second,x-1}});
					se.insert({{hold.first.first,l},x});
					se.erase(se.find(hold));
				}
				else{
					se.insert({{l,l},x});
				}
				s[l]='1';
			}
		}
		else{
			cin >> l >> r;
			r--;
			que[0].push_back({{l,r},{x,ptr++}});
		}
	}
	
	for(auto it:se){
		storage[0].push_back({{it.first.second,it.first.first},{it.second,q}});
	}
	se.clear();
	
	dnc(0,q);
	
	for(int x=0;x<ptr;x++){
		cout << ans[x] << "\n";
	}
}

int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int t=1;
	//cin >> t;
	while(t--){
		solve();
	}
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20