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JavaEE初阶Day 13:多线程(11)

解题思路:

class Solution {
    public boolean isSymmetric(TreeNode root) {
        if(root == null) return true;
        return recur(root.left, root.right);
    }
    boolean recur(TreeNode L, TreeNode R) {
        if (L == null && R == null) return true;
        if (L == null || R == null || L.val != R.val) return false;
        return recur(L.left, R.right) && recur(L.right, R.left);
    }
}
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