mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 02:58:13 +08:00
186 lines
20 KiB
JSON
186 lines
20 KiB
JSON
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"questionFrontendId": "剑指 Offer II 012",
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"title": "左右两边子数组的和相等",
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"translatedTitle": "左右两边子数组的和相等",
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"translatedContent": "<p>给你一个整数数组 <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> </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> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= nums.length <= 10<sup>4</sup></code></li>\n\t<li><code>-1000 <= nums[i] <= 1000</code></li>\n</ul>\n\n<p> </p>\n\n<p><meta charset=\"UTF-8\" />注意：本题与主站 724 题相同： <a href=\"https://leetcode-cn.com/problems/find-pivot-index/\">https://leetcode-cn.com/problems/find-pivot-index/</a></p>\n",
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