{"id":951,"date":"2025-12-13T19:31:10","date_gmt":"2025-12-13T11:31:10","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=951"},"modified":"2025-12-13T19:31:10","modified_gmt":"2025-12-13T11:31:10","slug":"leetcode-105-%e4%bb%8e%e5%89%8d%e5%ba%8f%e4%b8%8e%e4%b8%ad%e5%ba%8f%e9%81%8d%e5%8e%86%e5%ba%8f%e5%88%97%e6%9e%84%e9%80%a0%e4%ba%8c%e5%8f%89%e6%a0%91","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=951","title":{"rendered":"LeetCode 105 – \u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811"},"content":{"rendered":"

\u9898\u76ee\u63cf\u8ff0<\/h1>\n

\u7ed9\u5b9a\u4e24\u4e2a\u6574\u6570\u6570\u7ec4 preorder \u548c inorder \uff0c\u5176\u4e2d preorder \u662f\u4e8c\u53c9\u6811\u7684\u5148\u5e8f\u904d\u5386\uff0c inorder \u662f\u540c\u4e00\u68f5\u6811\u7684\u4e2d\u5e8f\u904d\u5386\uff0c\u8bf7\u6784\u9020\u4e8c\u53c9\u6811\u5e76\u8fd4\u56de\u5176\u6839\u8282\u70b9\u3002<\/p>\n

\u9898\u76ee\u5206\u6790<\/h1>\n

\u524d\u5e8f\u904d\u5386\u662f \u6839\u7ed3\u70b9 -> \u5de6\u5b50\u6811 -> \u53f3\u5b50\u6811\uff0c\u4e2d\u5e8f\u904d\u5386\u662f \u5de6\u5b50\u6811 -> \u6839\u7ed3\u70b9 -> \u53f3\u5b50\u6811
\n1. \u524d\u5e8f\u904d\u5386\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u5373\u6839\u7ed3\u70b9
\n2. \u6839\u636e\u6839\u7ed3\u70b9\u7684\u503c\uff0c\u5c06\u4e2d\u5e8f\u904d\u5386\u5212\u5206\u4e3a \u5de6 \u548c \u53f3 \u4e24\u4e2a\u533a\u57df
\n3. \u6839\u636e\u5de6\u5b50\u6811\u7ed3\u70b9\u7684\u4e2a\u6570\uff0c\u5c06\u524d\u5e8f\u904d\u5386\u5212\u5206\u4e3a \u5de6 \u548c \u53f3 \u4e24\u4e2a\u533a\u57df
\n4. \u9012\u5f52\u5904\u7406\u5b50\u6811<\/p>\n

Java<\/h1>\n
public TreeNode buildTree(int[] preorder, int[] inorder) {\n    if (preorder.length == 0 || inorder.length == 0) {\n        return null;\n    }\n    int rootValue = preorder[0];\n    int index = 0;\n    for (int i = 0; i < inorder.length; i++) {\n        if (inorder[i] == rootValue) {\n            index = i;\n            break;\n        }\n    }\n    TreeNode root = new TreeNode(rootValue);\n    root.left = buildTree(Arrays.copyOfRange(preorder, 1, 1 + index), Arrays.copyOfRange(inorder, 0, index));\n    root.right = buildTree(Arrays.copyOfRange(preorder, 1 + index, preorder.length), Arrays.copyOfRange(inorder, index + 1, inorder.length));\n    return root;\n}\n<\/code><\/pre>\n
Kotlin<\/h1>\n
fun buildTree(preorder: IntArray, inorder: IntArray): TreeNode? {\n    if (preorder.isEmpty() || inorder.isEmpty()) {\n        return null\n    }\n    val rootValue = preorder[0]\n    val index = inorder.indexOf(rootValue)\n    val root = TreeNode(rootValue)\n    root.left = buildTree(preorder.copyOfRange(1, index + 1), inorder.copyOfRange(0, index))\n    root.right =\n        buildTree(preorder.copyOfRange(index + 1, inorder.size), inorder.copyOfRange(index + 1, preorder.size))\n\n    return root\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee\u63cf\u8ff0 \u7ed9\u5b9a\u4e24\u4e2a\u6574\u6570\u6570\u7ec4 preorder \u548c inorder \uff0c\u5176\u4e2d preorder \u662f\u4e8c\u53c9\u6811\u7684\u5148\u5e8f\u904d\u5386 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[20,33,81,64],"class_list":["post-951","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-33","tag-81","tag-64"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/951","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=951"}],"version-history":[{"count":1,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/951\/revisions"}],"predecessor-version":[{"id":952,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/951\/revisions\/952"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}