Sum of leaf nodes at minimum level

In a binary tree, a leaf node is a node with no children. The minimum level of a binary tree is the level with the smallest depth.

To find the sum of leaf nodes at the minimum level, we need to traverse the tree and identify the leaf nodes at the minimum level. There are several ways to accomplish this task, but one possible approach is to use a depth-first search (DFS) algorithm.

Once we have identified the leaf nodes at the minimum level, we can calculate their sum and return it.

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