Leetcode Problem 1993. Operations on Tree

1993. Operations on Tree

Leetcode Solutions

Tree Traversal and Ancestor Tracking

  1. Initialize the LockingTree class with an array representing the parent of each node, a map to track the locked status of each node, and a list of children for each node.
  2. Implement the lock method to lock a node if it is currently unlocked.
  3. Implement the unlock method to unlock a node if it is currently locked by the same user.
  4. Implement the upgrade method to lock a node and unlock all its descendants if the node is unlocked, has at least one locked descendant, and no locked ancestors.
  5. For the upgrade method, traverse the tree upwards to check for locked ancestors and downwards to check for locked descendants.
  6. If the conditions are met, perform the upgrade by locking the node and unlocking all descendants.
UML Thumbnail

Node-based Locking Mechanism with Ancestor Verification

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