Leetcode Problem 2641. Cousins in Binary Tree II

2641. Cousins in Binary Tree II

Leetcode Solutions

BFS Traversal with Level Sum Calculation

  1. Perform a BFS traversal to calculate the sum of values at each level.
  2. Store the sums in a list where the index represents the level.
  3. Perform another BFS traversal.
  4. For each node, calculate the sum of its cousins by subtracting the node's value and its sibling's value (if any) from the level sum.
  5. Replace the node's value with the calculated sum of cousins.
  6. Return the modified root of the tree.
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DFS Traversal with Parent Tracking

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