Daily Coding Problem: Problem #1154 [Easy]

Good morning! Here's your coding interview problem for today.

This question was asked by Apple.

Given a binary tree, find a minimum path sum from root to a leaf.

For example, the minimum path in this tree is [10, 5, 1, -1], which has sum 15.

  10
 /  \
5    5
 \     \
   2    1
       /
     -1

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