Delete Node in a BST
A medium-tier problem at 53% community acceptance, tagged with Tree, Binary Search Tree, Binary Tree. Reported in interviews at LinkedIn and 1 others.
Delete Node in a BST shows up in assessments at LinkedIn and Oracle, and it's a medium-difficulty problem with a 53% acceptance rate. That acceptance rate tells you something: candidates either know the trick or they panic. The obvious approach feels right until you hit the case where the target node has two children, and suddenly your solution gets messy. This is the kind of problem where five minutes of confusion can tank your momentum. If you blank on the reconstruction logic during your live assessment, StealthCoder solves it invisibly while you stay calm.
Companies that ask "Delete Node in a BST"
Delete Node in a BST is the kind of problem that decides whether you pass. StealthCoder reads the problem on screen and surfaces a working solution in under 2 seconds. Invisible to screen share. The proctor sees nothing. Built by an engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage.
Get StealthCoderThe trap is thinking deletion is simple. Removing a leaf or a node with one child is straightforward, but a node with two children forces you to choose: do you replace it with the in-order successor or in-order predecessor, and how do you properly rewire the tree afterward? The pattern most candidates miss is that you need to find the successor (smallest node in the right subtree), copy its value into the target node, then recursively delete the successor. Alternatively, promote the predecessor from the left subtree. The recursive structure is clean once you see it, but the edge cases around subtree pointers catch people off guard. During a live OA, if you hit this problem and get stuck on the two-child case, StealthCoder surfaces a working solution in seconds, letting you move forward without derailing your entire assessment.
Pattern tags
You know the problem.
Make sure you actually pass it.
Delete Node in a BST recycles across companies for a reason. It's medium-tier, and most candidates blank under the timer. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem and surfaces a working solution in under 2 seconds. Built by an engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Delete Node in a BST interview FAQ
What makes Delete Node in a BST different from deleting in a regular linked list?+
BST deletion must preserve the binary search property after removal. With a linked list, you just unlink. With a BST, removing a node with two children requires careful tree reconstruction via in-order successor or predecessor to keep all left values smaller and right values larger.
Is this problem still asked at top companies?+
Yes. LinkedIn and Oracle both report it. The 53% acceptance rate suggests it filters candidates effectively, so it remains a common screen. If you're targeting either company, this pattern is worth solidifying before your OA.
What's the trickiest case in this problem?+
A node with two children. You must find the in-order successor (leftmost node in the right subtree), replace the target's value with it, then recursively delete the successor from the right subtree. Many candidates hardcode the wrong subtree or fail to recursively clean up the successor node itself.
How does this relate to general Binary Tree operations?+
Delete Node is a hybrid of Binary Tree traversal and Binary Search Tree properties. You navigate like a BST to find the node, but deletion logic requires careful pointer rewiring. Solid Binary Tree and BST fundamentals are prerequisites.
Can I pass this problem without knowing the successor trick?+
Unlikely at the 53% acceptance rate. The leaf and single-child cases are easy, but two children cases will fail or time out without the successor pattern. Mastering that specific reconstruction is the gatekeep.
Want the actual problem statement? View "Delete Node in a BST" on LeetCode →