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@tvolkov You're wrong. You have to verify that all nodes in the left sub tree are lower than the current node and all nodes in the right sub tree are greater than the current node. You need to know all the sub tree in order to determine this. Checking just the current node with it's parent or child nodes could easily yield incorrect results.
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Trees: Is This a Binary Search Tree?
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@tvolkov You're wrong. You have to verify that all nodes in the left sub tree are lower than the current node and all nodes in the right sub tree are greater than the current node. You need to know all the sub tree in order to determine this. Checking just the current node with it's parent or child nodes could easily yield incorrect results.