int** squareMatrix(int** a, int m, int n, int p) {
	int posRow = -1, posColumn = -1, size = 0;
	int temp[4];
	for (int i = 0; i < m; i++)
		for (int j = 0; j < n; j++) {
			if (a[i][j] == p) {
				temp[0] = m - 1 - j;
				temp[1] = j;
				temp[2] = m - 1 - i;
				temp[3] = i;
				int min = temp[0];
				for (int z = 1; z < 4; z++) {
					if (temp[z] > min) min = temp[z];
				}
				if (min > size) {
					posRow = i;
					posColumn = j;
					size = min;
				}
			}
		}
	int** b = new int* [size*2 + 1];
	for (int i = 0; i < size * 2 + 1; i++)
		b[i] = new int [size * 2 + 1];
	for (int i = posRow - size; i <= posRow + size; i++) {
		for (int j = posColumn - size; j <= posColumn + size; j++) {
			b[i][j] = a[i][j];
		}
	}
	return b;
}