Submission #1047622

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047622		vjudge1	Rectangles (IOI19_rect)	C++17	0 / 100	3 ms	604 KiB

rect

#include "rect.h"

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

const int lim=3000;

struct{
	int tree[lim];
	void clear(){
		fill(tree,tree+lim,0);
	}
	void update(int p,int val){
		p++;
		while(p<lim){
			tree[p]+=val;
			p+=p&-p;
		}
	}
	int query(int p){
		p++;
		int ans=0;
		while(p){
			ans+=tree[p];
			p-=p&-p;
		}
		return ans;
	}
	int query(int l,int r){
		if(r<l)return 0;
		return query(r)-query(l-1);
	}
}fw;

long long count_rectangles(std::vector<std::vector<int> > a) {
	int n=a.size();
	int m=a[0].size();
	if(n==3){
		int l[m];
		stack<int>st;
		for(int i=0;i<m;i++){
			while(st.size()&&a[1][st.top()]<a[1][i]){
				st.pop();
			}
			if(st.size()){
				l[i]=st.top();
			}else{
				l[i]=0;
			}
			st.push(i);
		}
		int r[m];
		while(st.size())st.pop();
		for(int i=m-1;0<=i;i--){
			while(st.size()&&a[1][st.top()]<a[1][i]){
				st.pop();
			}
			if(st.size()){
				r[i]=st.top();
			}else{
				r[i]=m;
			}
			st.push(i);
		}
		vector<int>torem[m+5];
		long int ans=0;
		for(int i=0;i<m;i++){
			for(int j:torem[i]){
				//cerr<<"removed "<<j<<" at "<<i<<"\n";
				fw.update(j,-1);
			}
			if(1<i&&l[i]<=i-2){
				int k=fw.query(l[i],i-2);
				//cerr<<"queried "<<l[i]<<" "<<i-2<<"\n";
				//cerr<<k<<"\n";
				ans+=k;
			}
			if(a[1][i]>=a[0][i]||a[1][i]>=a[2][i]){
				//cerr<<"clear at "<<i<<"\n";
				fw.clear();
				for(int j=i;j<m;j++){
					torem[j].clear();
				}
			}
			fw.update(i,1);
			torem[r[i]+1].push_back(i);
		}
		return ans;
	}
	return -1;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 22
• Subtask 5: 0 / 10
• Subtask 6: 0 / 13
• Subtask 7: 0 / 28