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    "https://leetcode.com/problems/toeplitz-matrix\n",
    "\n",
    "\n",
    "Runtime: 12 ms, faster than 83.54% of C++ online submissions for Toeplitz Matrix.\n",
    "Memory Usage: 17.9 MB, less than 6.67% of C++ online submissions for Toeplitz Matrix.\n",
    "\n",
    "\n",
    "```c++\n",
    "#include <vector>\n",
    "#include <algorithm>\n",
    "#include <iostream>\n",
    "\n",
    "using namespace std;\n",
    "\n",
    "\n",
    "class Solution {\n",
    "public:\n",
    "    int height, width;\n",
    "    vector<vector<int>> matrix;\n",
    "    bool is_in_matrix(int x, int y) {\n",
    "        if ((x < width) && (y < height)) {\n",
    "            return true;\n",
    "        } else {\n",
    "            return false;\n",
    "        }\n",
    "    }\n",
    "    bool does_it_ok(int start_x, int start_y) {\n",
    "        if (!is_in_matrix(start_x, start_y)) {\n",
    "            return false;\n",
    "        } else {\n",
    "            int 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",
    "                }\n",
    "            }\n",
    "            return true;\n",
    "        }\n",
    "    }\n",
    "\n",
    "    bool isToeplitzMatrix(vector<vector<int>>& matrix) {\n",
    "        //8:21\n",
    "        height = matrix.size();\n",
    "        width = matrix[0].size();\n",
    "        this->matrix = matrix;\n",
    "        for (int y=0; y<matrix.size(); y++) {\n",
    "            if (does_it_ok(0, y) == false) {\n",
    "                return false;\n",
    "            }\n",
    "        }\n",
    "        for (int x=0; x<matrix[0].size(); x++) {\n",
    "            if (does_it_ok(x, 0) == false) {\n",
    "                return false;\n",
    "            }\n",
    "        }\n",
    "        return true;\n",
    "        //8:29\n",
    "    }\n",
    "};\n",
    "```"
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