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            "questionId": "724",
            "questionFrontendId": "724",
            "categoryTitle": "Algorithms",
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            "title": "Find Pivot Index",
            "titleSlug": "find-pivot-index",
            "content": "<p>Given an array of integers <code>nums</code>, calculate the <strong>pivot index</strong> of this array.</p>\n\n<p>The <strong>pivot index</strong> is the index where the sum of all the numbers <strong>strictly</strong> to the left of the index is equal to the sum of all the numbers <strong>strictly</strong> to the index&#39;s right.</p>\n\n<p>If the index is on the left edge of the array, then the left sum is <code>0</code> because there are no elements to the left. This also applies to the right edge of the array.</p>\n\n<p>Return <em>the <strong>leftmost pivot index</strong></em>. If no such index exists, return <code>-1</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,7,3,6,5,6]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong>\nThe pivot index is 3.\nLeft sum = nums[0] + nums[1] + nums[2] = 1 + 7 + 3 = 11\nRight sum = nums[4] + nums[5] = 5 + 6 = 11\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,2,3]\n<strong>Output:</strong> -1\n<strong>Explanation:</strong>\nThere is no index that satisfies the conditions in the problem statement.</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [2,1,-1]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong>\nThe pivot index is 0.\nLeft sum = 0 (no elements to the left of index 0)\nRight sum = nums[1] + nums[2] = 1 + -1 = 0\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;= 10<sup>4</sup></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;1991:&nbsp;<a href=\"https://leetcode.com/problems/find-the-middle-index-in-array/\" target=\"_blank\">https://leetcode.com/problems/find-the-middle-index-in-array/</a></p>\n",
            "translatedTitle": "寻找数组的中心下标",
            "translatedContent": "<p>给你一个整数数组&nbsp;<code>nums</code> ，请计算数组的 <strong>中心下标 </strong>。</p>\n\n<p>数组<strong> 中心下标</strong><strong> </strong>是数组的一个下标，其左侧所有元素相加的和等于右侧所有元素相加的和。</p>\n\n<p>如果中心下标位于数组最左端，那么左侧数之和视为 <code>0</code> ，因为在下标的左侧不存在元素。这一点对于中心下标位于数组最右端同样适用。</p>\n\n<p>如果数组有多个中心下标，应该返回 <strong>最靠近左边</strong> 的那一个。如果数组不存在中心下标，返回 <code>-1</code> 。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1, 7, 3, 6, 5, 6]\n<strong>输出：</strong>3\n<strong>解释：</strong>\n中心下标是 3 。\n左侧数之和 sum = nums[0] + nums[1] + nums[2] = 1 + 7 + 3 = 11 ，\n右侧数之和 sum = nums[4] + nums[5] = 5 + 6 = 11 ，二者相等。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1, 2, 3]\n<strong>输出：</strong>-1\n<strong>解释：</strong>\n数组中不存在满足此条件的中心下标。</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [2, 1, -1]\n<strong>输出：</strong>0\n<strong>解释：</strong>\n中心下标是 0 。\n左侧数之和 sum = 0 ，（下标 0 左侧不存在元素），\n右侧数之和 sum = nums[1] + nums[2] = 1 + -1 = 0 。</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;= 10<sup>4</sup></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 1991 题相同：<a href=\"https://leetcode-cn.com/problems/find-the-middle-index-in-array/\" target=\"_blank\">https://leetcode-cn.com/problems/find-the-middle-index-in-array/</a></p>\n",
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