Leetcode Problem 2603. Collect Coins in a Tree

2603. Collect Coins in a Tree

Leetcode Solutions

Create an adjacency list to represent the tree.
Trim the tree by removing leaf nodes without coins.
Find the deepest node with a coin and set its grandparent as the starting node for DFS.
Perform DFS from the starting node, keeping track of the number of edges to visit in the subtree.
For each node visited in DFS, calculate the number of edges to visit for its children and update the count accordingly.
After DFS, the count at the starting node will be the answer, which is then multiplied by 2 to account for the return trip.

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