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Problem 101. Symmetric Tree #1

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Problem 101. Symmetric Tree #1

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4 changes: 3 additions & 1 deletion Leetcode-oneStop.md
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Original file line number Diff line number Diff line change
Expand Up @@ -227,8 +227,10 @@ public boolean isSymmetricRecursive(TreeNode root)

private boolean helperRecursive(TreeNode x, TreeNode y)
{
if (x == null || y == null) // Base Case: Both or one is null, so true
if (x == null && y == null) // Base Case: Both are null, so true
return true;
if (x == null || y == null) // Base Case: Passing above, here if any one is null, so false
return false;
return (x.val == y.val && helperRecursive(x.left, y.right) && helperRecursive(x.right, y.left));
// Check if values match and 1.left matches with the 2.right and 1.right matches with 2.left
}
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