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    "<h1>1351. Count Negative Numbers in a Sorted Matrix</h1>\n",
    "<hr>\n",
    "\n",
    "<!--Copy Paste Leetcode statement between-->\n",
    "<p>Given a <code>m x n</code> matrix <code>grid</code> which is sorted in non-increasing order both row-wise and column-wise, return <em>the number of <strong>negative</strong> numbers in</em> <code>grid</code>.</p>\n",
    "\n",
    "<p>&nbsp;</p>\n",
    "<p><strong>Example 1:</strong></p>\n",
    "\n",
    "<pre><strong>Input:</strong> grid = [[4,3,2,-1],[3,2,1,-1],[1,1,-1,-2],[-1,-1,-2,-3]]\n",
    "<strong>Output:</strong> 8\n",
    "<strong>Explanation:</strong> There are 8 negatives number in the matrix.\n",
    "</pre>\n",
    "\n",
    "<p><strong>Example 2:</strong></p>\n",
    "\n",
    "<pre><strong>Input:</strong> grid = [[3,2],[1,0]]\n",
    "<strong>Output:</strong> 0\n",
    "</pre>\n",
    "\n",
    "<p><strong>Example 3:</strong></p>\n",
    "\n",
    "<pre><strong>Input:</strong> grid = [[1,-1],[-1,-1]]\n",
    "<strong>Output:</strong> 3\n",
    "</pre>\n",
    "\n",
    "<p><strong>Example 4:</strong></p>\n",
    "\n",
    "<pre><strong>Input:</strong> grid = [[-1]]\n",
    "<strong>Output:</strong> 1\n",
    "</pre>\n",
    "\n",
    "<p>&nbsp;</p>\n",
    "<p><strong>Constraints:</strong></p>\n",
    "\n",
    "<ul>\n",
    "\t<li><code>m == grid.length</code></li>\n",
    "\t<li><code>n == grid[i].length</code></li>\n",
    "\t<li><code>1 &lt;= m, n &lt;= 100</code></li>\n",
    "\t<li><code>-100 &lt;= grid[i][j] &lt;= 100</code></li>\n",
    "</ul>\n",
    "<!--Copy Paste Leetcode statement between-->\n",
    "\n",
    "<p>&nbsp;</p>\n",
    "<a href=\"https://leetcode.com/problems/count-negative-numbers-in-a-sorted-matrix/\">Source</a> \n",
    "<hr>\n",
    "\n",
    "<h4>Code</h4>"
   ]
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   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
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   "source": [
    "def count_negatives(grid):\n",
    "    pass"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h4>Check</h4>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "8"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "grid = [[4,3,2,-1],[3,2,1,-1],[1,1,-1,-2],[-1,-1,-2,-3]]\n",
    "count_negatives(grid)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
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      "text/plain": [
       "0"
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     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "grid = [[3,2],[1,0]]\n",
    "count_negatives(grid)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "grid = [[1,-1],[-1,-1]]\n",
    "count_negatives(grid)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
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     "data": {
      "text/plain": [
       "1"
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     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "grid = [[-1]]\n",
    "count_negatives(grid)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<hr>\n",
    "<h4>Follow up:</h4>\n",
    "<p>Could you find an <code>O(n + m)</code> solution?</p>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 57,
   "metadata": {},
   "outputs": [],
   "source": [
    "def count_negatives(grid):\n",
    "    pass"
   ]
  }
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