leetcode-problemset/leetcode-cn/originData/compute-alternating-sum.json

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        "question": {
            "questionId": "4058",
            "questionFrontendId": "3701",
            "categoryTitle": "Algorithms",
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            "title": "Compute Alternating Sum",
            "titleSlug": "compute-alternating-sum",
            "content": "<p>You are given an integer array <code>nums</code>.</p>\n\n<p>The <strong>alternating sum</strong> of <code>nums</code> is the value obtained by <strong>adding</strong> elements at even indices and <strong>subtracting</strong> elements at odd indices. That is, <code>nums[0] - nums[1] + nums[2] - nums[3]...</code></p>\n\n<p>Return an integer denoting the alternating sum of <code>nums</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">nums = [1,3,5,7]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">-4</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li>Elements at even indices are <code>nums[0] = 1</code> and <code>nums[2] = 5</code> because 0 and 2 are even numbers.</li>\n\t<li>Elements at odd indices are <code>nums[1] = 3</code> and <code>nums[3] = 7</code> because 1 and 3 are odd numbers.</li>\n\t<li>The alternating sum is <code>nums[0] - nums[1] + nums[2] - nums[3] = 1 - 3 + 5 - 7 = -4</code>.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">nums = [100]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">100</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li>The only element at even indices is <code>nums[0] = 100</code> because 0 is an even number.</li>\n\t<li>There are no elements on odd indices.</li>\n\t<li>The alternating sum is <code>nums[0] = 100</code>.</li>\n</ul>\n</div>\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>1 &lt;= nums[i] &lt;= 100</code></li>\n</ul>\n",
            "translatedTitle": "计算交替和",
            "translatedContent": "<p>给你一个整数数组 <code>nums</code>。</p>\n\n<p><strong>交替和&nbsp;</strong>定义为：将 <code>nums</code> 中偶数下标位置的元素&nbsp;<strong>相加&nbsp;</strong>，<strong>减去</strong> 奇数下标位置的元素。即：<code>nums[0] - nums[1] + nums[2] - nums[3]...</code></p>\n\n<p>返回表示 <code>nums</code> 的交替和的整数。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">nums = [1,3,5,7]</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">-4</span></p>\n\n<p><strong>解释：</strong></p>\n\n<ul>\n\t<li>偶数下标位置的元素是 <code>nums[0] = 1</code> 和 <code>nums[2] = 5</code>，因为 0 和 2 是偶数。</li>\n\t<li>奇数下标位置的元素是 <code>nums[1] = 3</code> 和 <code>nums[3] = 7</code>，因为 1 和 3 是奇数。</li>\n\t<li>交替和为 <code>nums[0] - nums[1] + nums[2] - nums[3] = 1 - 3 + 5 - 7 = -4</code>。</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">nums = [100]</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">100</span></p>\n\n<p><strong>解释：</strong></p>\n\n<ul>\n\t<li>唯一的偶数下标位置的元素是 <code>nums[0] = 100</code>，因为 0 是偶数。</li>\n\t<li>没有奇数下标位置的元素。</li>\n\t<li>交替和为 <code>nums[0] = 100</code>。</li>\n</ul>\n</div>\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>1 &lt;= nums[i] &lt;= 100</code></li>\n</ul>\n",
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