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    "https://leetcode.com/problems/toeplitz-matrix\n",
    "\n",
    "\n",
    "Runtime: 88 ms, faster than 43.62% of Python3 online submissions for Toeplitz Matrix.\n",
    "Memory Usage: 14.5 MB, less than 5.53% of Python3 online submissions for Toeplitz Matrix.\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def isToeplitzMatrix(self, matrix: List[List[int]]) -> bool:\n",
    "        #4:10\n",
    "        height = len(matrix)\n",
    "        width = len(matrix[0])\n",
    "        def is_in_matrix(x, y):\n",
    "            if x < width and y < height:\n",
    "                return True\n",
    "            else:\n",
    "                return False\n",
    "        def does_it_OK(start_x, start_y):\n",
    "            #print(start_x, start_y)\n",
    "            if not (is_in_matrix(start_x, start_y)):\n",
    "                return False\n",
    "            else:\n",
    "                value = matrix[start_y][start_x]\n",
    "                while is_in_matrix(start_x+1, start_y+1):\n",
    "                    start_x += 1\n",
    "                    start_y += 1\n",
    "                    if matrix[start_y][start_x] != value:\n",
    "                        return False\n",
    "                return True\n",
    "        for y,_ in enumerate(matrix):\n",
    "            if does_it_OK(0, y) == False:\n",
    "                return False\n",
    "        for x,_ in enumerate(matrix[0]):\n",
    "            if does_it_OK(x, 0) == False:\n",
    "                return False\n",
    "        return True\n",
    "        #4:29\n",
    "```"
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