Submission #536441

#	Time	Username	Problem	Language	Result	Execution time	Memory
536441		zggf	Rectangles (IOI19_rect)	C++14	0 / 100	2 ms	596 KiB

rect

#include "rect.h"
#include <bits/stdc++.h>

using namespace std;

long long count_rectangles(vector<vector<int>> tab) {
	int n = tab.size();
	int m = tab[0].size();
	if(n<=2||m<=2) return 0;
	vector<vector<int>> lft(n, vector<int>(m));
	vector<vector<int>> up(n, vector<int>(m));
	vector<vector<vector<int>>> pos;
	pos.resize(n, vector<vector<int>>(m));
	for(int i = 0; i < n; i++){
		lft[i][0] = -1;
		for(int j = 1; j < m; j++){
			int pt = j-1;
			while(pt!=-1&&tab[i][pt]<tab[i][j]){
				pt = lft[i][pt];
				pos[i][j-1].push_back(pt);
			}
			if(pos[i][j-1].size()&&pos[i][j-1].back()==-1){
				pos[i][j-1].pop_back();
			}
			lft[i][j] = pt;
			if(tab[i][j]<=tab[i][j-1]){
				pos[i][j-1].resize(0);
			}
		}
	}
	vector<int> time(m+10);
	int wyn = 0;
	int cur = 10;
	for(int i = 0; i < m-1; i++){
		for(int j = 0; j < n; j++){
			cur+=2;
			int pt = j-1;
			vector<int> pos2;
			while(pt!=-1&&tab[pt][i]<tab[j][i]){
				pos2.push_back(pt);
				pt = up[pt][i];
			}
			//cout<<j<<" "<<i<<" "<<pos2.size()<<'\n';
			if(pos2.size()){
				//cout<<pos2[0]<<" "<<pos[pos2[0]][i].size()<<'\n';
				for(auto it:pos[pos2[0]][i]){
					if(pos2[0]!=0){
						time[it] = cur;
						wyn++;
						//cout<<j<<" "<<i<<" "<<pos2[0]<<" "<<it<<'\n';
					}
				}
			}
			for(int k = 1; k < (int)pos2.size(); k++){
				for(auto it:pos[pos2[k]][i]){
					if(time[it]==cur){
						if(pos2[k]!=0){
							time[it]++;
							wyn++;
							//cout<<j<<" "<<i<<" "<<pos2[k]<<" "<<it<<'\n';
						}
					}
				}
				cur++;
			}
			if(pos2.size()){
				pos[j][i].resize(0);
				for(auto it:pos[pos2.back()][i]){
					if(time[it]==cur){
						pos[j][i].push_back(it);	
					}
				}
			}
			up[j][i] = pt;
		}
	}
	/*
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			cout<<i<<" "<<j<<": ";
			for(auto it:pos[i][j]) cout<<it<<" ";
			cout<<'\n';
		}
	}
	*/
	return wyn;
}

• 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