Ruudukko

#include <iostream>
#include <vector>

int main(void)
{
	int n, m;
	std::cin >> n >> m;

	std::vector<char> ruudukko(n * n, '.');

	for (int i = 0; i < m; ++i)
	{
		int y1, x1, y2, x2;
		std::cin >> y1 >> x1 >> y2 >> x2;

		y1--; x1--; y2--; x2--;
		int index = y1 * n + x1;
		int rivit = y2 - y1 + 1;
		int sarakkeet = x2 - x1 + 1;

		for (int y = 0; y < rivit; ++y)
		{
			for (int x = 0; x < sarakkeet; ++x)
			{
				int idx = index + y * n + x;
				if (ruudukko[idx] == '.')
					ruudukko[idx] = '#';
				else
					ruudukko[idx] = '.';
			}
		}
	}

	for (int i = 0; i < n * n; ++i)
	{
		if (i % n == 0 && i != 0)
			std::cout << std::endl;
		std::cout << ruudukko[i];
	}
	std::cout << std::endl;

}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 3

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 4

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 5

Group: 3

Verdict: TIME LIMIT EXCEEDED