mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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193 lines
21 KiB
JSON
193 lines
21 KiB
JSON
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"title": "传递信息",
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"translatedTitle": "传递信息",
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"translatedContent": "<p>小朋友 A 在和 ta 的小伙伴们玩传信息游戏，游戏规则如下：</p>\n\n<ol>\n\t<li>有 n 名玩家，所有玩家编号分别为 0 ～ n-1，其中小朋友 A 的编号为 0</li>\n\t<li>每个玩家都有固定的若干个可传信息的其他玩家（也可能没有）。传信息的关系是单向的（比如 A 可以向 B 传信息，但 B 不能向 A 传信息）。</li>\n\t<li>每轮信息必须需要传递给另一个人，且信息可重复经过同一个人</li>\n</ol>\n\n<p>给定总玩家数 <code>n</code>，以及按 <code>[玩家编号,对应可传递玩家编号]</code> 关系组成的二维数组 <code>relation</code>。返回信息从小 A (编号 0 ) 经过 <code>k</code> 轮传递到编号为 n-1 的小伙伴处的方案数；若不能到达，返回 0。</p>\n\n<p><strong>示例 1：</strong></p>\n\n<blockquote>\n<p>输入：<code>n = 5, relation = [[0,2],[2,1],[3,4],[2,3],[1,4],[2,0],[0,4]], k = 3</code></p>\n\n<p>输出：<code>3</code></p>\n\n<p>解释：信息从小 A 编号 0 处开始，经 3 轮传递，到达编号 4。共有 3 种方案，分别是 0->2->0->4， 0->2->1->4， 0->2->3->4。</p>\n</blockquote>\n\n<p><strong>示例 2：</strong></p>\n\n<blockquote>\n<p>输入：<code>n = 3, relation = [[0,2],[2,1]], k = 2</code></p>\n\n<p>输出：<code>0</code></p>\n\n<p>解释：信息不能从小 A 处经过 2 轮传递到编号 2</p>\n</blockquote>\n\n<p><strong>限制：</strong></p>\n\n<ul>\n\t<li><code>2 <= n <= 10</code></li>\n\t<li><code>1 <= k <= 5</code></li>\n\t<li><code>1 <= relation.length <= 90, 且 relation[i].length == 2</code></li>\n\t<li><code>0 <= relation[i][0],relation[i][1] < n 且 relation[i][0] != relation[i][1]</code></li>\n</ul>\n",
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