Submission #1068107

#	Time	Username	Problem	Language	Result	Execution time	Memory
1068107		pcc	Rectangles (IOI19_rect)	C++17	10 / 100	5049 ms	67920 KiB

rect

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

#define ll long long

int N,M;

vector<vector<int>> good,row,col,arr;

ll calc(int sr,int sc){
	//cerr<<sr<<','<<sc<<endl;
	for(int i = 0;i<N;i++)for(int j = 0;j<M;j++)good[i][j] = col[i][j] = row[i][j] = 0;
	for(int i = 0;i<N;i++)good[i][sc] = 1;
	for(int i = 0;i<M;i++)good[sr][i] = 1;
	ll re = 0;
	for(int i = sr+1;i+1<N;i++){
		for(int j = sc+1;j+1<M;j++){
			row[i][j] = max(row[i][j-1],arr[i][j]);
			col[i][j] = max(col[i-1][j],arr[i][j]);
			good[i][j] = true;
			if(!good[i][j-1]||!good[i-1][j])good[i][j] = false;
			if(row[i][j]>=arr[i][sc]||col[i][j]>=arr[sr][j]){
				good[i][j] = false;
			}
			if(!good[i][j])break;
			if(arr[i+1][j]>col[i][j]&&arr[i][j+1]>row[i][j]){
				/*
				cerr<<"FOUND: "<<sr+1<<' '<<sc+1<<','<<i<<' '<<j<<endl;
				cerr<<arr[i][j]<<','<<col[i][j]<<','<<row[i][j]<<endl;
				*/
				re++;
			}
			if(arr[i+1][j]<=col[i][j])break;
		}
	}
	return re;
}

long long count_rectangles(std::vector<std::vector<int> > a) {
	N = a.size(),M = a[0].size();
	row = col = good = vector<vector<int>>(N,vector<int>(M,0));
	arr = a;
	ll ans = 0;
	for(int i = 0;i+1<N;i++){
		for(int j = 0;j+1<M;j++){
			ans += calc(i,j);
		}
	}
	return ans;
}

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