Submission #1178579

#	Time	Username	Problem	Language	Result	Execution time	Memory
1178579		alexander707070	Mosaic (IOI24_mosaic)	C++20	48 / 100	117 ms	26680 KiB

mosaic

#include<bits/stdc++.h>
#define MAXN 200007
using namespace std;

struct event{
	int l,r,id;
};

int row1[MAXN];
int row[3*MAXN],suffix[3*MAXN];

int n,q;
vector<event> queries[MAXN];

int a[MAXN],ans[MAXN];

int answer(int l,int r){
	return a[l]-a[r+1];
}

void calc_queries(int w){
	for(auto s:queries[w]){
		ans[s.id]=answer(s.l,s.r);
	}
}

vector<long long> solve(){
	vector<long long> sol;
	for(int i=0;i<q;i++){
		sol.push_back(ans[i]);
	}

	return sol;
}

vector<long long> mosaic(vector<int> X, vector<int> Y,vector<int> T, vector<int> B,vector<int> L, vector<int> R){
	n=int(X.size());
	q=int(T.size());

	for(int i=0;i<q;i++){
		queries[T[i]].push_back({L[i],R[i],i});
	}

	for(int i=0;i<n;i++)a[i]=X[i];
	for(int i=n-1;i>=0;i--)a[i]+=a[i+1];
	calc_queries(0);

	if(n==1)return solve();

	row1[0]=Y[1];
	for(int i=1;i<n;i++){
		if(row1[i-1]==0 and X[i]==0)row1[i]=1;
		else row1[i]=0;
	}
	/// here we have row 1

	for(int i=0;i<n;i++)a[i]=row1[i];
	for(int i=n-1;i>=0;i--)a[i]+=a[i+1];
	calc_queries(1);

	if(n==2)return solve();

	int start=2*n+1,fr=start;

	row[start-1]=Y[2];
	for(int i=start;i<=start+n-2;i++){
		if(row[i-1]==0 and row1[i-start+1]==0)row[i]=1;
		else row[i]=0;
	}

	for(int i=start;i<=start+n-1;i++){
		if(row[i]==1){
			fr=i; break;
		}
	}
	/// here we have row 2

	for(int i=0;i<n;i++)a[i]=row[i+start-1];
	for(int i=n-1;i>=0;i--)a[i]+=a[i+1];
	calc_queries(2);

	if(n==3)return solve();

	for(int f=start+n;f>=start-1;f--)suffix[f]=suffix[f+1]+row[f];

	for(int i=3;i<n;i++){
		start--;
		row[start-1]=Y[i];

		for(int f=start;f<fr-1;f++){
			row[f]=1-row[f-1];
		}

		for(int f=fr-1;f>=start-1;f--){
			suffix[f]=suffix[f+1]+row[f];
		}

		for(int f=start;f<=fr;f++){
			if(row[f]==1){
				fr=f; break;
			}
		}

		for(auto s:queries[i]){
			ans[s.id]=suffix[s.l+start-1] - suffix[s.r+start];
		}
	}

	return solve();
}

/*int main(){

	//mosaic({1,1,1,0,0,0,1,1,0,1,0,1,1,1,0},{1,1,1,0,0,0,1,1,0,1,0,1,1,1,0},{},{},{},{});

	auto yo=mosaic({1, 0, 1, 0}, {1, 1, 0, 1}, {1, 3}, {1, 3}, {0, 0}, {3, 3});
	for(auto s:yo)cout<<s<<" ";

	return 0;
}*/

• Subtask 0: 0 / 0
• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 7 / 7
• Subtask 4: 0 / 10
• Subtask 5: 0 / 8
• Subtask 6: 22 / 22
• Subtask 7: 19 / 19
• Subtask 8: 0 / 22