Leetcode Problem 666. Path Sum IV

666. Path Sum IV

Leetcode Solutions

Initialize a map to store nodes by their unique identifiers.
For each number in the input array, calculate its unique identifier and store it in the map along with its value.
Define a recursive DFS function that takes the unique identifier of the current node and the current path sum.
In the DFS function, check if the current node is a leaf node. If it is, add the current path sum to the total sum.
If the current node has a left child, recursively call the DFS function for the left child.
If the current node has a right child, recursively call the DFS function for the right child.
Start the DFS with the root node's unique identifier and an initial path sum of 0.
Return the total sum after the DFS completes.

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