Given a triangle, find the minimum path sum from top to bottom.
Each step you may move to adjacent numbers on the row below.
Given the following triangle
The minimum path sum from top to bottom is 11 (i.e., 2 + 3 + 5 + 1 = 11).
Bonus point if you are able to do this using only O(n) extra space,
where n is the total number of rows in the triangle.
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