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    "https://leetcode.com/problems/check-if-it-is-a-straight-line/\n",
    "\n",
    "\n",
    "Runtime: 60 ms, faster than 70.87% of Python3 online submissions for Check If It Is a Straight Line.\n",
    "Memory Usage: 14.3 MB, less than 5.11% of Python3 online submissions for Check If It Is a Straight Line.\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def checkStraightLine(self, coordinates: List[List[int]]) -> bool:\n",
    "        m = 3\n",
    "        for i in range(len(coordinates)):\n",
    "            if i < len(coordinates) - m+1:\n",
    "                combination = coordinates[i:i+m]\n",
    "                x1 = combination[0][0]\n",
    "                y1 = combination[0][1]\n",
    "                x2 = combination[1][0]\n",
    "                y2 = combination[1][1]\n",
    "                x3 = combination[2][0]\n",
    "                y3 = combination[2][1]\n",
    "                if not ((x2-x1)*(y3-y2) == (x3-x2)*(y2-y1)):\n",
    "                    return False\n",
    "        return True\n",
    "```"
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