{"id":66790,"date":"2026-01-27T16:04:53","date_gmt":"2026-01-27T08:04:53","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/66790.html"},"modified":"2026-01-27T16:04:53","modified_gmt":"2026-01-27T08:04:53","slug":"day14-%e4%bb%a3%e7%a0%81%e9%9a%8f%e6%83%b3%e5%bd%95%e7%ae%97%e6%b3%95%e8%ae%ad%e7%bb%83%e8%90%a5-%e4%ba%8c%e5%8f%89%e6%a0%91%e4%b8%93%e9%a2%982","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/66790.html","title":{"rendered":"day14 \u4ee3\u7801\u968f\u60f3\u5f55\u7b97\u6cd5\u8bad\u7ec3\u8425 \u4e8c\u53c9\u6811\u4e13\u98982"},"content":{"rendered":"

1 \u4eca\u65e5\u6253\u5361\u9898<\/h2>\n

\u7ffb\u8f6c\u4e8c\u53c9\u6811\u00a0226. \u7ffb\u8f6c\u4e8c\u53c9\u6811 – \u529b\u6263（LeetCode）<\/p>\n

\u5bf9\u79f0\u4e8c\u53c9\u6811\u00a0101. \u5bf9\u79f0\u4e8c\u53c9\u6811 – \u529b\u6263（LeetCode）<\/p>\n

\u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6\u00a0104. \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6 – \u529b\u6263（LeetCode）<\/p>\n

\u4e8c\u53c9\u6811\u7684\u6700\u5c0f\u6df1\u5ea6\u00a0111. \u4e8c\u53c9\u6811\u7684\u6700\u5c0f\u6df1\u5ea6 – \u529b\u6263（LeetCode）<\/p>\n

2 \u7ffb\u8f6c\u4e8c\u53c9\u6811<\/h2>\n

2.1 \u601d\u8def<\/h3>\n

\u7ffb\u8f6c\u4e8c\u53c9\u6811\u7684\u672c\u8d28\u662f：\u628a\u4e8c\u53c9\u6811\u4e2d\u6bcf\u4e2a\u8282\u70b9\u7684\u5de6\u5b50\u8282\u70b9\u548c\u53f3\u5b50\u8282\u70b9\u4ea4\u6362\u4f4d\u7f6e，\u5e76\u4e14\u8fd9\u4e2a\u64cd\u4f5c\u9700\u8981\u9012\u5f52\u5730\u5e94\u7528\u5230\u6240\u6709\u8282\u70b9\u4e0a（\u5305\u62ec\u5b50\u6811\u7684\u8282\u70b9）\u3002\u9012\u5f52\u7684\u6838\u5fc3\u903b\u8f91\u53ef\u4ee5\u62c6\u89e3\u4e3a 3 \u6b65： \u7ec8\u6b62\u6761\u4ef6：\u5982\u679c\u5f53\u524d\u8282\u70b9\u4e3a null（\u7a7a\u8282\u70b9），\u76f4\u63a5\u8fd4\u56de，\u65e0\u9700\u53cd\u8f6c（\u9012\u5f52\u7684\u51fa\u53e3，\u907f\u514d\u65e0\u9650\u9012\u5f52）\u3002 \u5904\u7406\u5f53\u524d\u8282\u70b9：\u4ea4\u6362\u5f53\u524d\u8282\u70b9\u7684\u5de6\u3001\u53f3\u5b50\u8282\u70b9\u3002 \u9012\u5f52\u5904\u7406\u5b50\u8282\u70b9：\u5206\u522b\u5bf9\u5f53\u524d\u8282\u70b9\u7684\u5de6\u5b50\u6811\u3001\u53f3\u5b50\u6811\u6267\u884c\u53cd\u8f6c\u64cd\u4f5c（\u56e0\u4e3a\u5b50\u6811\u672c\u8eab\u4e5f\u662f\u4e00\u68f5\u4e8c\u53c9\u6811，\u9700\u8981\u540c\u6837\u7684\u903b\u8f91\u53cd\u8f6c）\u3002<\/p>\n

\u53ef\u4ee5\u7528\u524d\u5e8f\u904d\u5386\u6216\u8005\u540e\u5e8f\u904d\u5386\u3002\u4f46\u662f\u4e2d\u5e8f\u904d\u5386\u4e0d\u884c，\u56e0\u4e3a\u6709\u7684\u4f1a\u7ffb\u8f6c2\u6b21，\u6709\u7684\u904d\u5386\u4e0d\u5230\u3002<\/p>\n

2.2 \u5b9e\u73b0\u4ee3\u7801<\/h3>\n

class Solution {
\n \/\/ \u4e3b\u65b9\u6cd5：\u53cd\u8f6c\u4e8c\u53c9\u6811，\u8fd4\u56de\u53cd\u8f6c\u540e\u7684\u6839\u8282\u70b9
\n public TreeNode invertTree(TreeNode root) {
\n \/\/ \u9012\u5f52\u7ec8\u6b62\u6761\u4ef6：\u5f53\u524d\u8282\u70b9\u4e3a\u7a7a，\u76f4\u63a5\u8fd4\u56de（\u6ca1\u6709\u53ef\u53cd\u8f6c\u7684\u8282\u70b9）
\n if (root == null) {
\n return root;
\n }<\/p>\n

\/\/ \u7b2c\u4e00\u6b65：\u5904\u7406\u5f53\u524d\u8282\u70b9\u2014\u2014\u4ea4\u6362\u5f53\u524d\u8282\u70b9\u7684\u5de6\u3001\u53f3\u5b50\u8282\u70b9
\n swap(root);<\/p>\n

\/\/ \u7b2c\u4e8c\u6b65：\u9012\u5f52\u53cd\u8f6c\u5de6\u5b50\u6811（\u5de6\u5b50\u6811\u4e5f\u662f\u4e00\u68f5\u4e8c\u53c9\u6811，\u9700\u8981\u540c\u6837\u7684\u903b\u8f91）
\n invertTree(root.left);<\/p>\n

\/\/ \u7b2c\u4e09\u6b65：\u9012\u5f52\u53cd\u8f6c\u53f3\u5b50\u6811（\u53f3\u5b50\u6811\u4e5f\u662f\u4e00\u68f5\u4e8c\u53c9\u6811，\u9700\u8981\u540c\u6837\u7684\u903b\u8f91）
\n invertTree(root.right);<\/p>\n

\/\/ \u8fd4\u56de\u53cd\u8f6c\u540e\u7684\u6839\u8282\u70b9
\n return root;
\n }<\/p>\n

\/\/ \u8f85\u52a9\u65b9\u6cd5：\u4ea4\u6362\u4e00\u4e2a\u8282\u70b9\u7684\u5de6\u3001\u53f3\u5b50\u8282\u70b9
\n private void swap(TreeNode node) {
\n \/\/ \u4e34\u65f6\u53d8\u91cf\u4fdd\u5b58\u5de6\u5b50\u8282\u70b9
\n TreeNode temp = node.left;
\n \/\/ \u628a\u53f3\u5b50\u8282\u70b9\u8d4b\u503c\u7ed9\u5de6\u5b50\u8282\u70b9
\n node.left = node.right;
\n \/\/ \u628a\u4e34\u65f6\u4fdd\u5b58\u7684\u5de6\u5b50\u8282\u70b9\u8d4b\u503c\u7ed9\u53f3\u5b50\u8282\u70b9
\n node.right = temp;
\n }
\n} <\/p>\n

3 \u5bf9\u79f0\u4e8c\u53c9\u6811<\/h2>\n

3.1 \u601d\u8def<\/h3>\n

\u5224\u65ad\u4e00\u68f5\u4e8c\u53c9\u6811\u662f\u5426\u5bf9\u79f0，\u672c\u8d28\u662f\u5224\u65ad\u4e8c\u53c9\u6811\u7684\u5de6\u5b50\u6811\u548c\u53f3\u5b50\u6811\u662f\u5426\u4e92\u4e3a\u955c\u50cf，\u955c\u50cf\u7684\u6838\u5fc3\u6761\u4ef6\u662f： \u4e24\u4e2a\u5bf9\u5e94\u8282\u70b9\u7684\u503c\u76f8\u7b49； \u8282\u70b9 A \u7684\u5de6\u5b50\u8282\u70b9 \u8981\u548c \u8282\u70b9 B \u7684\u53f3\u5b50\u8282\u70b9 \u5bf9\u79f0； \u8282\u70b9 A \u7684\u53f3\u5b50\u8282\u70b9 \u8981\u548c \u8282\u70b9 B \u7684\u5de6\u5b50\u8282\u70b9 \u5bf9\u79f0； \u9012\u5f52\u7ec8\u6b62\u6761\u4ef6：\u8981\u4e48\u4e24\u4e2a\u8282\u70b9\u90fd\u4e3a\u7a7a（\u5bf9\u79f0），\u8981\u4e48\u4e00\u4e2a\u4e3a\u7a7a\u4e00\u4e2a\u4e0d\u4e3a\u7a7a（\u4e0d\u5bf9\u79f0），\u8981\u4e48\u503c\u4e0d\u76f8\u7b49（\u4e0d\u5bf9\u79f0）\u3002<\/p>\n

\u9012\u5f52\u7684\u903b\u8f91\u662f：\u5148\u5224\u65ad\u5f53\u524d\u5c42\u7684\u4e24\u4e2a\u8282\u70b9\u662f\u5426\u5bf9\u79f0，\u518d\u9012\u5f52\u5224\u65ad\u5185\u5c42\u3001\u5916\u5c42\u5b50\u8282\u70b9\u662f\u5426\u90fd\u5bf9\u79f0，\u53ea\u6709\u6240\u6709\u5c42\u7ea7\u90fd\u6ee1\u8db3，\u624d\u662f\u5bf9\u79f0\u4e8c\u53c9\u6811\u3002<\/p>\n<\/p>\n

3.2 \u5b9e\u73b0\u4ee3\u7801<\/h3>\n

class Solution {
\n \/\/ \u4e3b\u65b9\u6cd5：\u5224\u65ad\u4e8c\u53c9\u6811\u662f\u5426\u5bf9\u79f0
\n public boolean isSymmetric(TreeNode root) {
\n \/\/ \u7279\u6b8a\u60c5\u51b5：\u6839\u8282\u70b9\u4e3a\u7a7a，\u76f4\u63a5\u8ba4\u4e3a\u662f\u5bf9\u79f0\u7684
\n if (root == null) {
\n return true;
\n }
\n \/\/ \u6838\u5fc3\u903b\u8f91：\u6bd4\u8f83\u6839\u8282\u70b9\u7684\u5de6\u5b50\u6811\u548c\u53f3\u5b50\u6811\u662f\u5426\u4e92\u4e3a\u955c\u50cf
\n return compare(root.left, root.right);
\n }<\/p>\n

\/\/ \u8f85\u52a9\u9012\u5f52\u65b9\u6cd5：\u6bd4\u8f83\u4e24\u4e2a\u8282\u70b9（\u5de6\u5b50\u6811\u8282\u70b9\u548c\u53f3\u5b50\u6811\u8282\u70b9）\u662f\u5426\u5bf9\u79f0
\n private boolean compare(TreeNode left, TreeNode right) {
\n \/\/ \u60c5\u51b51：\u5de6\u8282\u70b9\u4e3a\u7a7a，\u53f3\u8282\u70b9\u4e0d\u4e3a\u7a7a \u2192 \u4e0d\u5bf9\u79f0
\n if (left == null && right != null) {
\n return false;
\n }
\n \/\/ \u60c5\u51b52：\u5de6\u8282\u70b9\u4e0d\u4e3a\u7a7a，\u53f3\u8282\u70b9\u4e3a\u7a7a \u2192 \u4e0d\u5bf9\u79f0
\n else if (left != null && right == null) {
\n return false;
\n }
\n \/\/ \u60c5\u51b53：\u5de6\u53f3\u8282\u70b9\u90fd\u4e3a\u7a7a \u2192 \u5bf9\u79f0（\u9012\u5f52\u7ec8\u6b62\u7684\u6709\u6548\u6761\u4ef6）
\n else if (left == null && right == null) {
\n return true;
\n }
\n \/\/ \u60c5\u51b54：\u5de6\u53f3\u8282\u70b9\u90fd\u4e0d\u4e3a\u7a7a，\u4f46\u503c\u4e0d\u76f8\u7b49 \u2192 \u4e0d\u5bf9\u79f0
\n else if (left.val != right.val) {
\n return false;
\n }<\/p>\n

\/\/ \u8d70\u5230\u8fd9\u91cc，\u8bf4\u660e\u5f53\u524d\u5de6\u53f3\u8282\u70b9\u503c\u76f8\u7b49，\u9700\u8981\u9012\u5f52\u5224\u65ad\u300c\u5916\u5c42\u300d\u548c\u300c\u5185\u5c42\u300d\u662f\u5426\u90fd\u5bf9\u79f0
\n \/\/ \u5916\u5c42：\u5de6\u8282\u70b9\u7684\u5de6\u5b50\u8282\u70b9 \u2194 \u53f3\u8282\u70b9\u7684\u53f3\u5b50\u8282\u70b9（\u955c\u50cf\u7684\u5916\u4fa7）
\n boolean outside = compare(left.left, right.right);
\n \/\/ \u5185\u5c42：\u5de6\u8282\u70b9\u7684\u53f3\u5b50\u8282\u70b9 \u2194 \u53f3\u8282\u70b9\u7684\u5de6\u5b50\u8282\u70b9（\u955c\u50cf\u7684\u5185\u4fa7）
\n boolean inside = compare(left.right, right.left);<\/p>\n

\/\/ \u53ea\u6709\u5916\u5c42\u548c\u5185\u5c42\u90fd\u5bf9\u79f0，\u5f53\u524d\u4e24\u4e2a\u8282\u70b9\u624d\u662f\u5bf9\u79f0\u7684
\n return outside && inside;
\n }
\n} <\/p>\n

4 \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6<\/h2>\n

4.1 \u601d\u8def<\/h3>\n

\u7ec8\u6b62\u6761\u4ef6：\u5982\u679c\u5f53\u524d\u8282\u70b9\u4e3a null（\u7a7a\u8282\u70b9），\u6df1\u5ea6\u4e3a 0（\u6ca1\u6709\u8282\u70b9\u5c31\u6ca1\u6709\u6df1\u5ea6）； \u9012\u5f52\u5206\u89e3：\u5206\u522b\u8ba1\u7b97\u5f53\u524d\u8282\u70b9\u7684\u5de6\u5b50\u6811\u6700\u5927\u6df1\u5ea6\u548c\u53f3\u5b50\u6811\u6700\u5927\u6df1\u5ea6； \u5408\u5e76\u7ed3\u679c：\u5f53\u524d\u8282\u70b9\u7684\u6df1\u5ea6 = \u5de6\u53f3\u5b50\u6811\u6df1\u5ea6\u7684\u6700\u5927\u503c + 1（+1 \u662f\u56e0\u4e3a\u8981\u5305\u542b\u5f53\u524d\u8282\u70b9\u672c\u8eab）\u3002<\/p>\n

\u7528\u540e\u5e8f\u904d\u5386<\/p>\n

4.2 \u5b9e\u73b0\u4ee3\u7801<\/h3>\n

class Solution {
\n \/\/ \u4e3b\u65b9\u6cd5：\u6c42\u4e8c\u53c9\u6811\u6700\u5927\u6df1\u5ea6
\n public int maxDepth(TreeNode root) {
\n \/\/ \u7ec8\u6b62\u6761\u4ef6：\u7a7a\u8282\u70b9\u6df1\u5ea6\u4e3a0
\n if (root == null) {
\n return 0;
\n }
\n \/\/ \u9012\u5f52\u8ba1\u7b97\u5de6\u5b50\u6811\u6df1\u5ea6
\n int leftDepth = maxDepth(root.left);
\n \/\/ \u9012\u5f52\u8ba1\u7b97\u53f3\u5b50\u6811\u6df1\u5ea6
\n int rightDepth = maxDepth(root.right);
\n \/\/ \u5f53\u524d\u8282\u70b9\u6df1\u5ea6 = \u5de6\u53f3\u5b50\u6811\u6700\u5927\u503c + 1（\u5f53\u524d\u8282\u70b9）
\n return Math.max(leftDepth, rightDepth) + 1;
\n }
\n} <\/p>\n

5 \u4e8c\u53c9\u6811\u7684\u6700\u5c0f\u6df1\u5ea6<\/h2>\n

5.1 \u601d\u8def<\/h3>\n

\u7ec8\u6b62\u6761\u4ef6：\u548c\u6700\u5927\u6df1\u5ea6\u4e00\u81f4 \u2192 \u5982\u679c\u5f53\u524d\u8282\u70b9\u4e3a null，\u8fd4\u56de 0； \u7279\u6b8a\u60c5\u51b5\u5904\u7406（\u6700\u5927\u6df1\u5ea6\u6ca1\u6709\u8fd9\u4e00\u6b65）： \u5982\u679c\u5f53\u524d\u8282\u70b9\u53ea\u6709\u5de6\u5b50\u6811（\u53f3\u5b50\u6811\u4e3a\u7a7a）：\u6700\u5c0f\u6df1\u5ea6 = \u5de6\u5b50\u6811\u6df1\u5ea6 + 1（\u56e0\u4e3a\u53f3\u5b50\u6811\u4e3a\u7a7a，\u65e0\u6cd5\u6784\u6210\u5230\u53f6\u5b50\u7684\u8def\u5f84）； \u5982\u679c\u5f53\u524d\u8282\u70b9\u53ea\u6709\u53f3\u5b50\u6811（\u5de6\u5b50\u6811\u4e3a\u7a7a）：\u6700\u5c0f\u6df1\u5ea6 = \u53f3\u5b50\u6811\u6df1\u5ea6 + 1（\u540c\u7406）； \u666e\u901a\u60c5\u51b5：\u5f53\u524d\u8282\u70b9\u65e2\u6709\u5de6\u5b50\u6811\u53c8\u6709\u53f3\u5b50\u6811 \u2192 \u6700\u5c0f\u6df1\u5ea6 = \u5de6\u53f3\u5b50\u6811\u6df1\u5ea6\u7684\u6700\u5c0f\u503c + 1（\u548c\u6700\u5927\u6df1\u5ea6\u7684 max \u6539\u4e3a min）\u3002<\/p>\n

5.2 \u5b9e\u73b0\u4ee3\u7801<\/h3>\n

class Solution {
\n public int minDepth(TreeNode root) {
\n \/\/ \u7ec8\u6b62\u6761\u4ef6：\u7a7a\u8282\u70b9\u7684\u6df1\u5ea6\u4e3a0
\n if (root == null) {
\n return 0;
\n }<\/p>\n

\/\/ \u9012\u5f52\u8ba1\u7b97\u5de6\u5b50\u6811\u7684\u6df1\u5ea6
\n int leftDepth = minDepth(root.left);
\n \/\/ \u9012\u5f52\u8ba1\u7b97\u53f3\u5b50\u6811\u7684\u6df1\u5ea6
\n int rightDepth = minDepth(root.right);<\/p>\n

\/\/ \u7279\u6b8a\u60c5\u51b51：\u5f53\u524d\u8282\u70b9\u53ea\u6709\u5de6\u5b50\u6811（\u53f3\u5b50\u6811\u4e3a\u7a7a）\u2192 \u53ea\u80fd\u8d70\u5de6\u5b50\u6811
\n if (root.left != null && root.right == null) {
\n return 1 + leftDepth;
\n }
\n \/\/ \u7279\u6b8a\u60c5\u51b52：\u5f53\u524d\u8282\u70b9\u53ea\u6709\u53f3\u5b50\u6811（\u5de6\u5b50\u6811\u4e3a\u7a7a）\u2192 \u53ea\u80fd\u8d70\u53f3\u5b50\u6811
\n else if (root.left == null && root.right != null) {
\n return 1 + rightDepth;
\n }
\n \/\/ \u666e\u901a\u60c5\u51b5：\u65e2\u6709\u5de6\u5b50\u6811\u53c8\u6709\u53f3\u5b50\u6811 \u2192 \u53d6\u5de6\u53f3\u5b50\u6811\u6df1\u5ea6\u7684\u6700\u5c0f\u503c + \u5f53\u524d\u5c42
\n else {
\n return 1 + Math.min(leftDepth, rightDepth);
\n }
\n }
\n} <\/p>\n

6 \u989d\u5916\u9898\u76ee<\/h2>\n

6.1 \u76f8\u540c\u7684\u6811（\u4e0e\u5bf9\u79f0\u4e8c\u53c9\u6811\u76f8\u4f3c）100. \u76f8\u540c\u7684\u6811 – \u529b\u6263（LeetCode）<\/h3>\n

6.1.1 \u601d\u8def<\/h4>\n

\u7ec8\u6b62\u6761\u4ef6： \u4e24\u68f5\u6811\u7684\u5f53\u524d\u8282\u70b9\u90fd\u4e3a\u7a7a \u2192 \u76f8\u540c，\u8fd4\u56de true； \u4e00\u4e2a\u4e3a\u7a7a\u3001\u4e00\u4e2a\u4e0d\u4e3a\u7a7a \u2192 \u7ed3\u6784\u4e0d\u540c，\u8fd4\u56de false； \u90fd\u4e0d\u4e3a\u7a7a\u4f46\u503c\u4e0d\u76f8\u7b49 \u2192 \u503c\u4e0d\u540c，\u8fd4\u56de false\u3002 \u9012\u5f52\u903b\u8f91： \u5f53\u524d\u8282\u70b9\u6ee1\u8db3\u6761\u4ef6\u540e，\u9012\u5f52\u5224\u65adp \u7684\u5de6\u5b50\u8282\u70b9 \u548c q \u7684\u5de6\u5b50\u8282\u70b9\u662f\u5426\u76f8\u540c； \u9012\u5f52\u5224\u65adp \u7684\u53f3\u5b50\u8282\u70b9 \u548c q \u7684\u53f3\u5b50\u8282\u70b9\u662f\u5426\u76f8\u540c； \u53ea\u6709\u5de6\u53f3\u5b50\u6811\u90fd\u76f8\u540c，\u6574\u68f5\u6811\u624d\u76f8\u540c（\u8fd4\u56de left && right）\u3002<\/p>\n

6.1.2 \u5b9e\u73b0\u4ee3\u7801<\/h4>\n

class Solution {
\n \/\/ \u4e3b\u65b9\u6cd5：\u5224\u65ad\u4e24\u68f5\u6811p\u548cq\u662f\u5426\u5b8c\u5168\u76f8\u540c
\n public boolean isSameTree(TreeNode p, TreeNode q) {
\n \/\/ \u60c5\u51b51：p\u548cq\u7684\u5f53\u524d\u8282\u70b9\u90fd\u4e3a\u7a7a \u2192 \u7ed3\u6784\u5339\u914d，\u8fd4\u56detrue（\u9012\u5f52\u7ec8\u6b62\u6761\u4ef6）
\n if (p == null && q == null) {
\n return true;
\n }
\n \/\/ \u60c5\u51b52：p\u4e3a\u7a7a\u4f46q\u4e0d\u4e3a\u7a7a \u2192 \u7ed3\u6784\u4e0d\u5339\u914d，\u8fd4\u56defalse（\u9012\u5f52\u7ec8\u6b62\u6761\u4ef6）
\n else if (p == null && q != null) {
\n return false;
\n }
\n \/\/ \u60c5\u51b53：p\u4e0d\u4e3a\u7a7a\u4f46q\u4e3a\u7a7a \u2192 \u7ed3\u6784\u4e0d\u5339\u914d，\u8fd4\u56defalse（\u9012\u5f52\u7ec8\u6b62\u6761\u4ef6）
\n else if (p != null && q == null) {
\n return false;
\n }
\n \/\/ \u60c5\u51b54：p\u548cq\u90fd\u4e0d\u4e3a\u7a7a，\u4f46\u503c\u4e0d\u76f8\u7b49 \u2192 \u503c\u4e0d\u5339\u914d，\u8fd4\u56defalse（\u9012\u5f52\u7ec8\u6b62\u6761\u4ef6）
\n else if (p.val != q.val) {
\n return false;
\n }<\/p>\n

\/\/ \u8d70\u5230\u8fd9\u91cc：\u5f53\u524d\u8282\u70b9\u503c\u76f8\u7b49\u3001\u7ed3\u6784\u4e5f\u5339\u914d，\u9700\u8981\u9012\u5f52\u5224\u65ad\u5b50\u8282\u70b9
\n \/\/ \u9012\u5f52\u5224\u65ad\u5de6\u5b50\u6811：p\u7684\u5de6\u5b50\u8282\u70b9 \u2194 q\u7684\u5de6\u5b50\u8282\u70b9（\u548c\u5bf9\u79f0\u6811\u7684\u6838\u5fc3\u533a\u522b！）
\n boolean left = isSameTree(p.left, q.left);
\n \/\/ \u9012\u5f52\u5224\u65ad\u53f3\u5b50\u6811：p\u7684\u53f3\u5b50\u8282\u70b9 \u2194 q\u7684\u53f3\u5b50\u8282\u70b9（\u548c\u5bf9\u79f0\u6811\u7684\u6838\u5fc3\u533a\u522b！）
\n boolean right = isSameTree(p.right, q.right);<\/p>\n

\/\/ \u53ea\u6709\u5de6\u53f3\u5b50\u6811\u90fd\u76f8\u540c，\u5f53\u524d\u4e24\u68f5\u6811\u624d\u76f8\u540c
\n return left && right;
\n }
\n} <\/p>\n

6.2 \u53e6\u4e00\u9897\u6811\u7684\u5b50\u6811572. \u53e6\u4e00\u68f5\u6811\u7684\u5b50\u6811 – \u529b\u6263（LeetCode）<\/h3>\n

6.2.1 \u601d\u8def<\/h4>\n

\u5728\u76f8\u540c\u7684\u6811\u57fa\u7840\u4e0a\u6539\u9020\u800c\u6765\u3002<\/p>\n

\u5224\u65ad subRoot \u662f root \u7684\u5b50\u6811，\u672c\u8d28\u662f：\u628a root \u4e2d\u7684\u6bcf\u4e00\u4e2a\u8282\u70b9\u90fd\u5f53\u4f5c \u201c\u5019\u9009\u6839\u8282\u70b9\u201d，\u68c0\u67e5\u4ee5\u8be5\u8282\u70b9\u4e3a\u6839\u7684\u5b50\u6811\u662f\u5426\u548c subRoot \u5b8c\u5168\u76f8\u540c；\u53ea\u8981\u6709\u4e00\u4e2a\u5019\u9009\u8282\u70b9\u5339\u914d\u6210\u529f，\u5c31\u8fd4\u56de true，\u5426\u5219\u8fd4\u56de false\u3002<\/p>\n

\u5916\u5c42\u9012\u5f52（isSubtree）\u7684\u5b8c\u6574\u903b\u8f91 \u7ec8\u6b62\u6761\u4ef6：\u5982\u679c\u5f53\u524d root \u4e3a\u7a7a，\u8bf4\u660e\u5df2\u7ecf\u904d\u5386\u5230\u53f6\u5b50\u8282\u70b9\u7684\u5b50\u8282\u70b9，\u6ca1\u6709\u5339\u914d\u53ef\u80fd，\u8fd4\u56de false； \u5f53\u524d\u8282\u70b9\u68c0\u67e5：\u5982\u679c\u4ee5\u5f53\u524d root \u4e3a\u6839\u7684\u5b50\u6811\u548c subRoot \u76f8\u540c（\u8c03\u7528 isSameTree \u8fd4\u56de true），\u76f4\u63a5\u8fd4\u56de true； \u9012\u5f52\u904d\u5386\u5b50\u6811：\u5982\u679c\u5f53\u524d\u8282\u70b9\u4e0d\u5339\u914d，\u5c31\u9012\u5f52\u68c0\u67e5root \u7684\u5de6\u5b50\u6811\u548croot \u7684\u53f3\u5b50\u6811\u662f\u5426\u5305\u542b subRoot，\u53ea\u8981\u5176\u4e2d\u4e00\u4e2a\u8fd4\u56de true，\u6574\u4f53\u5c31\u8fd4\u56de true； \u6700\u7ec8\u7ed3\u679c：\u53ea\u6709\u6240\u6709\u8282\u70b9\u90fd\u68c0\u67e5\u8fc7\u4e14\u90fd\u4e0d\u5339\u914d，\u624d\u8fd4\u56de false\u3002<\/p>\n

6.2.2 \u5b9e\u73b0\u4ee3\u7801 \u00a0<\/h4>\n

class Solution {
\n public boolean isSubtree(TreeNode root, TreeNode subRoot) {
\n \/\/ \u7ec8\u6b62\u6761\u4ef6：root\u4e3a\u7a7a，\u6ca1\u6709\u5b50\u6811\u80fd\u5339\u914d，\u8fd4\u56defalse
\n if (root == null) {
\n return false;
\n }<\/p>\n

\/\/ \u60c5\u51b51：\u5f53\u524droot\u548csubRoot\u5b8c\u5168\u76f8\u540c \u2192 \u627e\u5230\u5b50\u6811，\u8fd4\u56detrue
\n if (isSameTree(root, subRoot)) {
\n return true;
\n }<\/p>\n

\/\/ \u60c5\u51b52：\u5f53\u524d\u8282\u70b9\u4e0d\u5339\u914d，\u9012\u5f52\u627e\u300c\u5de6\u5b50\u6811\u7684\u6240\u6709\u8282\u70b9\u300d\u548c\u300c\u53f3\u5b50\u6811\u7684\u6240\u6709\u8282\u70b9\u300d
\n \/\/ \u5173\u952e：\u8fd9\u91cc\u8981\u8c03\u7528 isSubtree \u800c\u4e0d\u662f isSameTree！
\n boolean leftFind = isSubtree(root.left, subRoot); \/\/ \u9012\u5f52\u904d\u5386\u5de6\u5b50\u6811\u7684\u6240\u6709\u8282\u70b9
\n boolean rightFind = isSubtree(root.right, subRoot); \/\/ \u9012\u5f52\u904d\u5386\u53f3\u5b50\u6811\u7684\u6240\u6709\u8282\u70b9<\/p>\n

\/\/ \u53ea\u8981\u5de6\/\u53f3\u5b50\u6811\u91cc\u6709\u4e00\u4e2a\u627e\u5230，\u5c31\u8fd4\u56detrue
\n return leftFind || rightFind;
\n }<\/p>\n

\/\/ \u8f85\u52a9\u65b9\u6cd5：\u5224\u65ad\u4e24\u68f5\u6811\u662f\u5426\u5b8c\u5168\u76f8\u540c（\u903b\u8f91\u6ca1\u95ee\u9898，\u590d\u7528）
\n private boolean isSameTree(TreeNode p, TreeNode q) {
\n if (p == null && q == null) return true;
\n else if (p != null && q == null) return false;
\n else if (p == null && q != null) return false;
\n else if (p.val != q.val) return false;<\/p>\n

boolean left = isSameTree(p.left, q.left);
\n boolean right = isSameTree(p.right, q.right);
\n return left && right;
\n }
\n} <\/p>\n

6.3 N\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6<\/h3>\n

6.3.1 \u601d\u8def<\/h4>\n

\u7ec8\u6b62\u6761\u4ef6：\u5982\u679c\u5f53\u524d\u8282\u70b9\u4e3a null（\u7a7a\u8282\u70b9），\u6df1\u5ea6\u4e3a 0（\u548c\u4e8c\u53c9\u6811\u4e00\u81f4）； \u9012\u5f52\u903b\u8f91： \u521d\u59cb\u5316\u4e00\u4e2a\u53d8\u91cf curDepth \u8bb0\u5f55\u6240\u6709\u5b50\u8282\u70b9\u7684\u6700\u5927\u6df1\u5ea6（\u521d\u59cb\u4e3a 0）； \u904d\u5386\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u5b50\u8282\u70b9，\u9012\u5f52\u8ba1\u7b97\u6bcf\u4e2a\u5b50\u8282\u70b9\u7684\u6df1\u5ea6，\u5e76\u7528 Math.max \u4fdd\u7559\u6700\u5927\u7684\u90a3\u4e2a； \u5408\u5e76\u7ed3\u679c：\u5f53\u524d\u8282\u70b9\u7684\u6df1\u5ea6 = \u6240\u6709\u5b50\u8282\u70b9\u7684\u6700\u5927\u6df1\u5ea6 + 1（+1 \u662f\u7b97\u4e0a\u5f53\u524d\u8282\u70b9\u672c\u8eab，\u548c\u4e8c\u53c9\u6811\u4e00\u81f4）\u3002 \u7b80\u5355\u7c7b\u6bd4：\u4e8c\u53c9\u6811\u662f \u201c\u95ee\u5de6\u3001\u53f3\u4e24\u4e2a\u5b69\u5b50\u8c01\u7684\u6df1\u5ea6\u6df1\u201d，N \u53c9\u6811\u662f \u201c\u95ee\u6240\u6709\u5b69\u5b50\u8c01\u7684\u6df1\u5ea6\u6df1\u201d，\u6700\u540e\u52a0\u81ea\u5df1\u8fd9\u4e00\u5c42\u3002<\/p>\n

6.3.2 \u5b9e\u73b0\u4ee3\u7801<\/h4>\n

class Solution {
\n \/\/ \u4e3b\u65b9\u6cd5：\u6c42N\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6
\n public int maxDepth(Node root) {
\n \/\/ \u9012\u5f52\u7ec8\u6b62\u6761\u4ef6：\u7a7a\u8282\u70b9\u7684\u6df1\u5ea6\u4e3a0（\u548c\u4e8c\u53c9\u6811\u5b8c\u5168\u4e00\u81f4）
\n if (root == null) {
\n return 0;
\n }<\/p>\n

\/\/ \u521d\u59cb\u5316\u5f53\u524d\u8282\u70b9\u6240\u6709\u5b50\u8282\u70b9\u7684\u6700\u5927\u6df1\u5ea6\u4e3a0
\n int curDepth = 0;<\/p>\n

\/\/ \u904d\u5386\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u5b50\u8282\u70b9（\u6838\u5fc3\u533a\u522b：\u4e8c\u53c9\u6811\u53ea\u904d\u5386left\/right，N\u53c9\u6811\u904d\u5386\u6240\u6709children）
\n for (int i = 0; i < root.children.size(); i++) {
\n \/\/ \u9012\u5f52\u8ba1\u7b97\u5f53\u524d\u5b50\u8282\u70b9\u7684\u6df1\u5ea6，\u5e76\u7528Math.max\u4fdd\u7559\u6700\u5927\u7684\u5b50\u8282\u70b9\u6df1\u5ea6
\n curDepth = Math.max(maxDepth(root.children.get(i)), curDepth);
\n }<\/p>\n

\/\/ \u5f53\u524d\u8282\u70b9\u7684\u6df1\u5ea6 = \u6240\u6709\u5b50\u8282\u70b9\u7684\u6700\u5927\u6df1\u5ea6 + 1（\u5f53\u524d\u8282\u70b9\u672c\u8eab）
\n return curDepth + 1;
\n }
\n} <\/p>\n","protected":false},"excerpt":{"rendered":"

1 \u4eca\u65e5\u6253\u5361\u9898
\n\u7ffb\u8f6c\u4e8c\u53c9\u6811\u00a0226. \u7ffb\u8f6c\u4e8c\u53c9\u6811 – \u529b\u6263（LeetCode）
\n\u5bf9\u79f0\u4e8c\u53c9\u6811\u00a0101. \u5bf9\u79f0\u4e8c\u53c9\u6811 – \u529b\u6263（LeetCode）
\n\u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6\u00a0104. \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6 – \u529b\u6263（LeetCode）
\n\u4e8c\u53c9\u6811\u7684\u6700\u5c0f\u6df1\u5ea6\u00a0111. \u4e8c\u53c9\u6811\u7684\u6700\u5c0f\u6df1\u5ea6 – \u529b\u6263（LeetCode）
\n2 \u7ffb\u8f6c\u4e8c\u53c9\u6811
\n2.1 \u601d\u8def
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