Leetcode Problem 2445. Number of Nodes With Value One

2445. Number of Nodes With Value One

Leetcode Solutions

Top-Down Propagation of Flips

  1. Initialize an array flips of size n + 1 with all elements set to 0.
  2. For each query q in queries, increment flips[q] by 1.
  3. Iterate over the nodes starting from the root to the leaves.
  4. For each node i, add the number of flips from its parent flips[i // 2] to flips[i].
  5. After the propagation, iterate over the nodes and count the number of nodes with an odd number of flips.
  6. Return the count of nodes with value 1.
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DFS Post-Order Traversal

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