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2022-05-02 23:44:12 +08:00
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leetcode-cn/originData/random-pick-with-weight.json
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@@ -12,7 +12,7 @@
"translatedContent": "<p>给你一个 <strong>下标从 0 开始</strong> 的正整数数组&nbsp;<code>w</code> ，其中&nbsp;<code>w[i]</code> 代表第 <code>i</code> 个下标的权重。</p>\n\n<p>请你实现一个函数&nbsp;<code>pickIndex</code>&nbsp;，它可以 <strong>随机地</strong> 从范围 <code>[0, w.length - 1]</code> 内（含 <code>0</code> 和 <code>w.length - 1</code>）选出并返回一个下标。选取下标 <code>i</code>&nbsp;的 <strong>概率</strong> 为 <code>w[i] / sum(w)</code> 。</p>\n\n<ol>\n</ol>\n\n<ul>\n\t<li>例如，对于 <code>w = [1, 3]</code>，挑选下标 <code>0</code> 的概率为 <code>1 / (1 + 3)&nbsp;= 0.25</code> （即，25%），而选取下标 <code>1</code> 的概率为 <code>3 / (1 + 3)&nbsp;= 0.75</code>（即，<code>75%</code>）。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>\n[\"Solution\",\"pickIndex\"]\n[[[1]],[]]\n<strong>输出：</strong>\n[null,0]\n<strong>解释：</strong>\nSolution solution = new Solution([1]);\nsolution.pickIndex(); // 返回 0，因为数组中只有一个元素，所以唯一的选择是返回下标 0。</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>\n[\"Solution\",\"pickIndex\",\"pickIndex\",\"pickIndex\",\"pickIndex\",\"pickIndex\"]\n[[[1,3]],[],[],[],[],[]]\n<strong>输出：</strong>\n[null,1,1,1,1,0]\n<strong>解释：</strong>\nSolution solution = new Solution([1, 3]);\nsolution.pickIndex(); // 返回 1，返回下标 1，返回该下标概率为 3/4 。\nsolution.pickIndex(); // 返回 1\nsolution.pickIndex(); // 返回 1\nsolution.pickIndex(); // 返回 1\nsolution.pickIndex(); // 返回 0，返回下标 0，返回该下标概率为 1/4 。\n\n由于这是一个随机问题，允许多个答案，因此下列输出都可以被认为是正确的:\n[null,1,1,1,1,0]\n[null,1,1,1,1,1]\n[null,1,1,1,0,0]\n[null,1,1,1,0,1]\n[null,1,0,1,0,0]\n......\n诸若此类。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= w.length &lt;= 10<sup>4</sup></code></li>\n\t<li><code>1 &lt;= w[i] &lt;= 10<sup>5</sup></code></li>\n\t<li><code>pickIndex</code>&nbsp;将被调用不超过 <code>10<sup>4</sup></code>&nbsp;次</li>\n</ul>\n",
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@@ -155,7 +155,7 @@
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