mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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188 lines
27 KiB
JSON
188 lines
27 KiB
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"title": "Make Array Elements Equal to Zero",
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"content": "<p>You are given an integer array <code>nums</code>.</p>\n\n<p>Start by selecting a starting position <code>curr</code> such that <code>nums[curr] == 0</code>, and choose a movement <strong>direction</strong> of either left or right.</p>\n\n<p>After that, you repeat the following process:</p>\n\n<ul>\n\t<li>If <code>curr</code> is out of the range <code>[0, n - 1]</code>, this process ends.</li>\n\t<li>If <code>nums[curr] == 0</code>, move in the current direction by <strong>incrementing</strong> <code>curr</code> if you are moving right, or <strong>decrementing</strong> <code>curr</code> if you are moving left.</li>\n\t<li>Else if <code>nums[curr] > 0</code>:\n\t<ul>\n\t\t<li>Decrement <code>nums[curr]</code> by 1.</li>\n\t\t<li><strong>Reverse</strong> your movement direction (left becomes right and vice versa).</li>\n\t\t<li>Take a step in your new direction.</li>\n\t</ul>\n\t</li>\n</ul>\n\n<p>A selection of the initial position <code>curr</code> and movement direction is considered <strong>valid</strong> if every element in <code>nums</code> becomes 0 by the end of the process.</p>\n\n<p>Return the number of possible <strong>valid</strong> selections.</p>\n\n<p> </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 = [1,0,2,0,3]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The only possible valid selections are the following:</p>\n\n<ul>\n\t<li>Choose <code>curr = 3</code>, and a movement direction to the left.\n\n\t<ul>\n\t\t<li><code>[1,0,2,<strong><u>0</u></strong>,3] -> [1,0,<strong><u>2</u></strong>,0,3] -> [1,0,1,<strong><u>0</u></strong>,3] -> [1,0,1,0,<strong><u>3</u></strong>] -> [1,0,1,<strong><u>0</u></strong>,2] -> [1,0,<strong><u>1</u></strong>,0,2] -> [1,0,0,<strong><u>0</u></strong>,2] -> [1,0,0,0,<strong><u>2</u></strong>] -> [1,0,0,<strong><u>0</u></strong>,1] -> [1,0,<strong><u>0</u></strong>,0,1] -> [1,<strong><u>0</u></strong>,0,0,1] -> [<strong><u>1</u></strong>,0,0,0,1] -> [0,<strong><u>0</u></strong>,0,0,1] -> [0,0,<strong><u>0</u></strong>,0,1] -> [0,0,0,<strong><u>0</u></strong>,1] -> [0,0,0,0,<strong><u>1</u></strong>] -> [0,0,0,0,0]</code>.</li>\n\t</ul>\n\t</li>\n\t<li>Choose <code>curr = 3</code>, and a movement direction to the right.\n\t<ul>\n\t\t<li><code>[1,0,2,<strong><u>0</u></strong>,3] -> [1,0,2,0,<strong><u>3</u></strong>] -> [1,0,2,<strong><u>0</u></strong>,2] -> [1,0,<strong><u>2</u></strong>,0,2] -> [1,0,1,<strong><u>0</u></strong>,2] -> [1,0,1,0,<strong><u>2</u></strong>] -> [1,0,1,<strong><u>0</u></strong>,1] -> [1,0,<strong><u>1</u></strong>,0,1] -> [1,0,0,<strong><u>0</u></strong>,1] -> [1,0,0,0,<strong><u>1</u></strong>] -> [1,0,0,<strong><u>0</u></strong>,0] -> [1,0,<strong><u>0</u></strong>,0,0] -> [1,<strong><u>0</u></strong>,0,0,0] -> [<strong><u>1</u></strong>,0,0,0,0] -> [0,0,0,0,0].</code></li>\n\t</ul>\n\t</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 = [2,3,4,0,4,1,0]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>There are no possible valid selections.</p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= nums.length <= 100</code></li>\n\t<li><code>0 <= nums[i] <= 100</code></li>\n\t<li>There is at least one element <code>i</code> where <code>nums[i] == 0</code>.</li>\n</ul>\n",
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"translatedTitle": "使数组元素等于零",
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"translatedContent": "<p>给你一个整数数组 <code>nums</code> 。</p>\n\n<p>开始时，选择一个满足 <code>nums[curr] == 0</code> 的起始位置 <code>curr</code> ，并选择一个移动 <strong>方向</strong> ：向左或者向右。</p>\n\n<p>此后，你需要重复下面的过程：</p>\n\n<ul>\n\t<li>如果 <code>curr</code> 超过范围 <code>[0, n - 1]</code> ，过程结束。</li>\n\t<li>如果 <code>nums[curr] == 0</code> ，沿当前方向继续移动：如果向右移，则 <strong>递增</strong> <code>curr</code> ；如果向左移，则 <strong>递减</strong> <code>curr</code> 。</li>\n\t<li>如果 <code>nums[curr] > 0</code>:\n\t<ul>\n\t\t<li>将 <code>nums[curr]</code> 减 1 。</li>\n\t\t<li><strong>反转</strong> 移动方向（向左变向右，反之亦然）。</li>\n\t\t<li>沿新方向移动一步。</li>\n\t</ul>\n\t</li>\n</ul>\n\n<p>如果在结束整个过程后，<code>nums</code> 中的所有元素都变为 0 ，则认为选出的初始位置和移动方向 <strong>有效</strong> 。</p>\n\n<p>返回可能的有效选择方案数目。</p>\n\n<p> </p>\n\n<p><b>示例 1：</b></p>\n\n<div class=\"example-block\">\n<p><span class=\"example-io\"><b>输入：</b>nums = [1,0,2,0,3]</span></p>\n\n<p><span class=\"example-io\"><b>输出：</b>2</span></p>\n\n<p><b>解释：</b></p>\n\n<p>可能的有效选择方案如下：</p>\n\n<ul>\n\t<li>选择 <code>curr = 3</code> 并向左移动。\n\n\t<ul>\n\t\t<li><code>[1,0,2,<strong><u>0</u></strong>,3] -> [1,0,<strong><u>2</u></strong>,0,3] -> [1,0,1,<strong><u>0</u></strong>,3] -> [1,0,1,0,<strong><u>3</u></strong>] -> [1,0,1,<strong><u>0</u></strong>,2] -> [1,0,<strong><u>1</u></strong>,0,2] -> [1,0,0,<strong><u>0</u></strong>,2] -> [1,0,0,0,<strong><u>2</u></strong>] -> [1,0,0,<strong><u>0</u></strong>,1] -> [1,0,<strong><u>0</u></strong>,0,1] -> [1,<strong><u>0</u></strong>,0,0,1] -> [<strong><u>1</u></strong>,0,0,0,1] -> [0,<strong><u>0</u></strong>,0,0,1] -> [0,0,<strong><u>0</u></strong>,0,1] -> [0,0,0,<strong><u>0</u></strong>,1] -> [0,0,0,0,<strong><u>1</u></strong>] -> [0,0,0,0,0]</code>.</li>\n\t</ul>\n\t</li>\n\t<li>选择 <code>curr = 3</code> 并向右移动。\n\t<ul>\n\t\t<li><code>[1,0,2,<strong><u>0</u></strong>,3] -> [1,0,2,0,<strong><u>3</u></strong>] -> [1,0,2,<strong><u>0</u></strong>,2] -> [1,0,<strong><u>2</u></strong>,0,2] -> [1,0,1,<strong><u>0</u></strong>,2] -> [1,0,1,0,<strong><u>2</u></strong>] -> [1,0,1,<strong><u>0</u></strong>,1] -> [1,0,<strong><u>1</u></strong>,0,1] -> [1,0,0,<strong><u>0</u></strong>,1] -> [1,0,0,0,<strong><u>1</u></strong>] -> [1,0,0,<strong><u>0</u></strong>,0] -> [1,0,<strong><u>0</u></strong>,0,0] -> [1,<strong><u>0</u></strong>,0,0,0] -> [<strong><u>1</u></strong>,0,0,0,0] -> [0,0,0,0,0].</code></li>\n\t</ul>\n\t</li>\n</ul>\n</div>\n\n<p><b>示例 2：</b></p>\n\n<div class=\"example-block\">\n<p><span class=\"example-io\"><b>输入：</b>nums = [2,3,4,0,4,1,0]</span></p>\n\n<p><span class=\"example-io\"><b>输出：</b>0</span></p>\n\n<p><b>解释：</b></p>\n\n<p>不存在有效的选择方案。</p>\n</div>\n\n<p> </p>\n\n<p><b>提示：</b></p>\n\n<ul>\n\t<li><code>1 <= nums.length <= 100</code></li>\n\t<li><code>0 <= nums[i] <= 100</code></li>\n\t<li>至少存在一个元素 <code>i</code> 满足 <code>nums[i] == 0</code> 。</li>\n</ul>\n",
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