Submission #1030936

#	Time	Username	Problem	Language	Result	Execution time	Memory
1030936		fv3	Rectangles (IOI19_rect)	C++14	0 / 100	83 ms	50000 KiB

rect

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

using namespace std;
using namespace std;
typedef long long ll;

int N, M;
int l, r, t, d, cnt;

vector<vector<int>> grid, visited;
void DFS(int x, int y)
{
	visited[y][x] = 1; cnt++;
	l < min(l, x); r = max(r, x);
	t < min(t, y); d = max(d, y);

	if (x && !grid[y][x-1] && !visited[y][x-1])
		DFS(x-1, y);
	if (y && !grid[y-1][x] && !visited[y-1][x])
		DFS(x, y-1);
	if (x+1!=M && !grid[y][x+1] && !visited[y][x+1])
		DFS(x+1, y);
	if (y+1!=N && !grid[y+1][x] && !visited[y+1][x])
		DFS(x, y+1);
}

ll count_rectangles(vector<vector<int>> a) 
{
	N = a.size();
	M = a[0].size();

	if (N < 3 || M < 3)
		return 0;

	grid = a;
	visited = vector<vector<int>>(N, vector<int>(M));

	ll res = 0;
	for (int y = 1; y < N-1; y++)
	{
		for (int x = 1; x < M-1; x++)
		{
			if (visited[y][x] || grid[y][x]) continue;
			l = r = x;
			t = d = y;
			cnt = 0;
			DFS(x, y);

			if (cnt == (r - l + 1) * (d - t + 1) && l && t && d < N-1 && r < M-1)
				res++;
		}
	}

	return res;
}

Compilation message (stderr)

rect.cpp: In function 'void DFS(int, int)':
rect.cpp:15:4: warning: value computed is not used [-Wunused-value]
   15 |  l < min(l, x); r = max(r, x);
      |  ~~^~~~~~~~~~~
rect.cpp:16:4: warning: value computed is not used [-Wunused-value]
   16 |  t < min(t, y); d = max(d, y);
      |  ~~^~~~~~~~~~~

• 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