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@LinhTy i looked into your last submission and it looks like your logic is wrong. May be you could think of how to solve it. The left child of the root should be less than the root value and right child of root should be greater than the root value. If you do this, there are still some conditions to check for.
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Trees: Is This a Binary Search Tree?
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@LinhTy i looked into your last submission and it looks like your logic is wrong. May be you could think of how to solve it. The left child of the root should be less than the root value and right child of root should be greater than the root value. If you do this, there are still some conditions to check for.