Minimum Path in a Triangle

The problem is to find the minimum path sum from top to bottom if given a triangle. Each step you may move to adjacent numbers on the row below.

Example:

Input:

[
     [2],
    [3,4],
   [6,5,7],
  [4,1,8,3]
]

Output:

  11

Explanation:

The minimum path sum from top to bottom is 2 + 3 + 5 + 1 = 11.

Try it yourself

Title

Script

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  >>> a = [1, 2, 3]
  >>> a[-1]
  3

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