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31 lines
644 B
31 lines
644 B
package class30;
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public class Problem_0101_SymmetricTree {
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public static class TreeNode {
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int val;
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TreeNode left;
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TreeNode right;
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}
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public boolean isSymmetric(TreeNode root) {
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return isMirror(root, root);
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}
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// 一棵树是原始树 head1
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// 另一棵是翻面树 head2
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public static boolean isMirror(TreeNode head1, TreeNode head2) {
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if (head1 == null && head2 == null) {
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return true;
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}
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if (head1 != null && head2 != null) {
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return head1.val == head2.val
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&& isMirror(head1.left, head2.right)
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&& isMirror(head1.right, head2.left);
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}
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// 一个为空，一个不为空 false
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return false;
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}
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}
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