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            "title": "Ways to Split Array Into Three Subarrays",
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            "content": "<p>A split of an integer array is <strong>good</strong> if:</p>\r\n\r\n<ul>\r\n\t<li>The array is split into three <strong>non-empty</strong> contiguous subarrays - named <code>left</code>, <code>mid</code>, <code>right</code> respectively from left to right.</li>\r\n\t<li>The sum of the elements in <code>left</code> is less than or equal to the sum of the elements in <code>mid</code>, and the sum of the elements in <code>mid</code> is less than or equal to the sum of the elements in <code>right</code>.</li>\r\n</ul>\r\n\r\n<p>Given <code>nums</code>, an array of <strong>non-negative</strong> integers, return <em>the number of <strong>good</strong> ways to split</em> <code>nums</code>. As the number may be too large, return it <strong>modulo</strong> <code>10<sup>9 </sup>+ 7</code>.</p>\r\n\r\n<p>&nbsp;</p>\r\n<p><strong>Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> nums = [1,1,1]\r\n<strong>Output:</strong> 1\r\n<strong>Explanation:</strong> The only good way to split nums is [1] [1] [1].</pre>\r\n\r\n<p><strong>Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> nums = [1,2,2,2,5,0]\r\n<strong>Output:</strong> 3\r\n<strong>Explanation:</strong> There are three good ways of splitting nums:\r\n[1] [2] [2,2,5,0]\r\n[1] [2,2] [2,5,0]\r\n[1,2] [2,2] [5,0]\r\n</pre>\r\n\r\n<p><strong>Example 3:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> nums = [3,2,1]\r\n<strong>Output:</strong> 0\r\n<strong>Explanation:</strong> There is no good way to split nums.</pre>\r\n\r\n<p>&nbsp;</p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>3 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>\r\n\t<li><code>0 &lt;= nums[i] &lt;= 10<sup>4</sup></code></li>\r\n</ul>",
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                    "code": "class Solution(object):\n    def waysToSplit(self, nums):\n        \"\"\"\n        :type nums: List[int]\n        :rtype: int\n        \"\"\"\n        ",
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            "hints": [
                "Create a prefix array to efficiently find the sum of subarrays.",
                "As we are dividing the array into three subarrays, there are two \"walls\". Iterate over the right wall positions and find where the left wall could be for each right wall position.",
                "Use binary search to find the left-most position and right-most position the left wall could be."
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