Submission #292520

#	Time	Username	Problem	Language	Result	Execution time	Memory
292520		miss_robot	Rectangles (IOI19_rect)	C++14	38 / 100	5087 ms	626144 KiB

rect

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

#pragma GCC optimize("O3")

using namespace std;

const int N = 2500, M = 2500;
int n, m;
long long sol;
int f[N][M], dx[]={0,1,0,-1}, dy[]={1,0,-1,0};

void bf(int x, int y, int X, int Y, vector<int> r, vector<int> c){
	if(X == n-1 || Y == m-1) return;
	int t = 1;
	for(int i = x; i <= X; i++){
		if(r[i] >= f[i][y-1]) return;
		if(r[i] >= f[i][Y+1]) t = 0;
	}
	for(int j = y; j <= Y; j++){
		if(c[j] >= f[x-1][j]) return;
		if(c[j] >= f[X+1][j]) t = 0;
	}
	sol += t;
	if(y == Y){
		vector<int> cr = r, cc = c;
		cr[X+1] = f[X+1][y];
		cc[y] = max(cc[y], f[X+1][y]);
		bf(x, y, X+1, Y, cr, cc);
	}
	vector<int> cr = r, cc = c;
	for(int i = x; i <= X; i++) cr[i] = max(cr[i], f[i][Y+1]), cc[Y+1] = max(cc[Y+1], f[i][Y+1]);
	bf(x, y, X, Y+1, cr, cc);
}

void st1(){
	for(int i = 1; i < n-1; i++){
		for(int j = 1; j < m-1; j++){
			vector<int> r(n), c(m);
			r[i] = f[i][j], c[j] = f[i][j];
			bf(i, j, i, j, r, c);
		}
	}
}

void st5(){
	for(int i = 1, mx; i < m-1; i++){
		mx = 0;
		for(int j = i; j < m-1; j++){
			mx = max(mx, f[1][j]);
			if(f[1][j] >= f[1][i-1] || f[1][j] >= f[0][j] || f[1][j] >= f[2][j]) break;
			if(mx < f[1][j+1]) sol++;
		}
	}
}

int vis[N][M];

void flood(int x, int y, int &maxx, int &maxy, int &minx, int &miny, int &c){
	if(x < 0 || y < 0 || x == n || y == m || vis[x][y] || f[x][y]) return;
	c++;
	vis[x][y] = 1;
	maxx = max(maxx, x), minx = min(minx, x);
	maxy = max(maxy, y), miny = min(miny, y);
	for(int k = 0, i, j; k < 4; k++){
		i = x+dx[k], j = y+dy[k];
		flood(i, j, maxx, maxy, minx, miny, c);
	}
}

void st6(){
	for(int i = 1; i < n-1; i++){
		for(int j = 1; j < m-1; j++){
			if(vis[i][j] || f[i][j]) continue;
			int maxx = i, minx = i, maxy = j, miny = j, c = 0;
			flood(i, j, maxx, maxy, minx, miny, c);
			if(minx && miny && maxx < n-1 && maxy < m-1 && c == (maxx-minx+1)*(maxy-miny+1)) sol++;
		}
	}
}

long long count_rectangles(vector< vector<int> > a){
	n = a.size(), m = a[0].size();
	if(n < 3 || m < 3) return 0;
	for(int i = 0; i < n; i++)
		for(int j = 0; j < m; j++)
			f[i][j] = a[i][j];
	int s6 = 1;
	for(int i = 0; i < n; i++)
		for(int j = 0; j < m; j++)
			if(f[i][j] > 1) s6 = 0;
	if(n == 3) st5();
	else if(s6) st6();
	else st1();
	return sol;
}

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