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//'main' method must be in a class 'Rextester'. //Compiler version 1.8.0_111 import java.util.*; import java.lang.*; class TreeNode { int val; TreeNode left; TreeNode right; TreeNode(int x) { val = x; } } class Rextester { public static void main(String args[]) { System.out.println("Hello, World!"); } public boolean isSymmetric(TreeNode root) { return helper(root,root); } public boolean helper(TreeNode n1,TreeNode n2){ if(n1==null && n2==null) return true; if(n1==null || n2 == null) return false; return (n1.val==n2.val)&&helper(n1.left,n2.right)&&helper(n1.right,n2.left); } }
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