leetcode-problemset/leetcode-cn/originData/find-the-middle-index-in-array.json

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        "question": {
            "questionId": "2102",
            "questionFrontendId": "1991",
            "categoryTitle": "Algorithms",
            "boundTopicId": 972193,
            "title": "Find the Middle Index in Array",
            "titleSlug": "find-the-middle-index-in-array",
            "content": "<p>Given a <strong>0-indexed</strong> integer array <code>nums</code>, find the <strong>leftmost</strong> <code>middleIndex</code> (i.e., the smallest amongst all the possible ones).</p>\n\n<p>A <code>middleIndex</code> is an index where <code>nums[0] + nums[1] + ... + nums[middleIndex-1] == nums[middleIndex+1] + nums[middleIndex+2] + ... + nums[nums.length-1]</code>.</p>\n\n<p>If <code>middleIndex == 0</code>, the left side sum is considered to be <code>0</code>. Similarly, if <code>middleIndex == nums.length - 1</code>, the right side sum is considered to be <code>0</code>.</p>\n\n<p>Return <em>the <strong>leftmost</strong> </em><code>middleIndex</code><em> that satisfies the condition, or </em><code>-1</code><em> if there is no such index</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [2,3,-1,<u>8</u>,4]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The sum of the numbers before index 3 is: 2 + 3 + -1 = 4\nThe sum of the numbers after index 3 is: 4 = 4\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,-1,<u>4</u>]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> The sum of the numbers before index 2 is: 1 + -1 = 0\nThe sum of the numbers after index 2 is: 0\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [2,5]\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> There is no valid middleIndex.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 100</code></li>\n\t<li><code>-1000 &lt;= nums[i] &lt;= 1000</code></li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Note:</strong> This question is the same as&nbsp;724:&nbsp;<a href=\"https://leetcode.com/problems/find-pivot-index/\" target=\"_blank\">https://leetcode.com/problems/find-pivot-index/</a></p>\n",
            "translatedTitle": "找到数组的中间位置",
            "translatedContent": "<p>给你一个下标从 <strong>0</strong>&nbsp;开始的整数数组&nbsp;<code>nums</code>&nbsp;，请你找到 <strong>最左边</strong>&nbsp;的中间位置&nbsp;<code>middleIndex</code>&nbsp;（也就是所有可能中间位置下标最小的一个）。</p>\n\n<p>中间位置&nbsp;<code>middleIndex</code>&nbsp;是满足&nbsp;<code>nums[0] + nums[1] + ... + nums[middleIndex-1] == nums[middleIndex+1] + nums[middleIndex+2] + ... + nums[nums.length-1]</code>&nbsp;的数组下标。</p>\n\n<p>如果&nbsp;<code>middleIndex == 0</code>&nbsp;，左边部分的和定义为 <code>0</code>&nbsp;。类似的，如果&nbsp;<code>middleIndex == nums.length - 1</code>&nbsp;，右边部分的和定义为&nbsp;<code>0</code>&nbsp;。</p>\n\n<p>请你返回满足上述条件 <strong>最左边</strong>&nbsp;的<em>&nbsp;</em><code>middleIndex</code>&nbsp;，如果不存在这样的中间位置，请你返回&nbsp;<code>-1</code>&nbsp;。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<b>输入：</b>nums = [2,3,-1,<em><strong>8</strong></em>,4]\n<b>输出：</b>3\n<strong>解释：</strong>\n下标 3 之前的数字和为：2 + 3 + -1 = 4\n下标 3 之后的数字和为：4 = 4\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>nums = [1,-1,<em><strong>4</strong></em>]\n<b>输出：</b>2\n<strong>解释：</strong>\n下标 2 之前的数字和为：1 + -1 = 0\n下标 2 之后的数字和为：0\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<b>输入：</b>nums = [2,5]\n<b>输出：</b>-1\n<b>解释：</b>\n不存在符合要求的 middleIndex 。\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre>\n<b>输入：</b>nums = [<em><strong>1</strong></em>]\n<b>输出：</b>0\n<strong>解释：</strong>\n下标 0 之前的数字和为：0\n下标 0 之后的数字和为：0\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 100</code></li>\n\t<li><code>-1000 &lt;= nums[i] &lt;= 1000</code></li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>注意：</strong>本题与主站 724 题相同：<a href=\"https://leetcode-cn.com/problems/find-pivot-index/\" target=\"_blank\">https://leetcode-cn.com/problems/find-pivot-index/</a></p>\n",
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            "hints": [
                "Could we go from left to right and check to see if an index is a middle index?",
                "Do we need to sum every number to the left and right of an index each time?",
                "Use a prefix sum array where prefix[i] = nums[0] + nums[1] + ... + nums[i]."
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