mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 02:58:13 +08:00
187 lines
20 KiB
JSON
187 lines
20 KiB
JSON
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"categoryTitle": "Algorithms",
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"boundTopicId": 411215,
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"title": "追逐游戏",
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"translatedTitle": "追逐游戏",
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"translatedContent": "秋游中的小力和小扣设计了一个追逐游戏。他们选了秋日市集景区中的 N 个景点，景点编号为 1~N。此外，他们还选择了 N 条小路，满足任意两个景点之间都可以通过小路互相到达，且不存在两条连接景点相同的小路。整个游戏场景可视作一个无向连通图，记作二维数组 `edges`，数组中以 `[a,b]` 形式表示景点 a 与景点 b 之间有一条小路连通。\r\n\r\n小力和小扣只能沿景点间的小路移动。小力的目标是在最快时间内追到小扣，小扣的目标是尽可能延后被小力追到的时间。游戏开始前，两人分别站在两个不同的景点 `startA` 和 `startB`。每一回合，小力先行动，小扣观察到小力的行动后再行动。小力和小扣在每回合可选择以下行动之一：\r\n- 移动至相邻景点\r\n- 留在原地\r\n\r\n如果小力追到小扣（即两人于某一时刻出现在同一位置），则游戏结束。若小力可以追到小扣，请返回最少需要多少回合；若小力无法追到小扣，请返回 -1。\r\n\r\n注意：小力和小扣一定会采取最优移动策略。\r\n\r\n**示例 1：**\r\n>输入：`edges = [[1,2],[2,3],[3,4],[4,1],[2,5],[5,6]], startA = 3, startB = 5`\r\n>\r\n>输出：`3`\r\n>\r\n>解释：\r\n>{:height=\"250px\"}\r\n>\r\n>第一回合，小力移动至 2 号点，小扣观察到小力的行动后移动至 6 号点；\r\n>第二回合，小力移动至 5 号点，小扣无法移动，留在原地；\r\n>第三回合，小力移动至 6 号点，小力追到小扣。返回 3。\r\n\r\n\r\n**示例 2：**\r\n>输入：`edges = [[1,2],[2,3],[3,4],[4,1]], startA = 1, startB = 3`\r\n>\r\n>输出：`-1`\r\n>\r\n>解释：\r\n>{:height=\"250px\"}\r\n>\r\n>小力如果不动，则小扣也不动；否则小扣移动到小力的对角线位置。这样小力无法追到小扣。\r\n\r\n**提示：**\r\n- `edges` 的长度等于图中节点个数\r\n- `3 <= edges.length <= 10^5`\r\n- `1 <= edges[i][0], edges[i][1] <= edges.length 且 edges[i][0] != edges[i][1]`\r\n- `1 <= startA, startB <= edges.length 且 startA != startB`\r\n\r\n",
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"code": "# @param {Integer[][]} edges\n# @param {Integer} start_a\n# @param {Integer} start_b\n# @return {Integer}\ndef chase_game(edges, start_a, start_b)\n\nend",
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