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增加参考资料
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docs/0212-word-search-ii.adoc

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回溯:先根据首字母对单词进行分类,再遍历矩阵,找出首字母对应的坐标点。再对单词列表和坐标点进行回溯匹配。通过 43 / 65 个测试用例,后超时!
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利用前缀树+回溯,可以避免重复判断单词相同的前缀部分,可以节省大量的计算。
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[[src-0212]]
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[tabs]
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====
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== 参考资料
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. https://leetcode.cn/problems/word-search-ii/solutions/1000172/dan-ci-sou-suo-ii-by-leetcode-solution-7494/[212. 单词搜索 II - 官方题解^]
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. https://leetcode.cn/problems/word-search-ii/solutions/1000184/tong-ge-lai-shua-ti-la-yi-ti-si-jie-zi-d-2igi/[212. 单词搜索 II - 一题四解:字典树 & DFS & 回溯 & 剪枝 & 位运算,层层递进,不断优化!^]

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