Leetcode Problem 2858. Minimum Edge Reversals So Every Node Is Reachable

2858. Minimum Edge Reversals So Every Node Is Reachable

Leetcode Solutions

DFS Twice | Time O(n) | Space O(n) | Beats% Runtime,% Memory

  1. Initialize two lists to store directed and reversed edges.
  2. Perform a DFS from the root node (node 0) to count the number of reversed edges needed to reach each node.
  3. Store the result for the root node.
  4. Perform a second DFS to calculate the result for each node based on the result of the root node.
  5. For each child node, if the edge is direct, increment the result; if the edge is reversed, decrement the result.
  6. Return the result list containing the minimum number of edge reversals for each node.
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Brute Force with Caching | Time O(n^) | Space O(n^)

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