Minimal Path Sum

Suppose we have a m x n matrix filled with non-negative integers, find a path from top left corner to bottom right corner. which minimizes the sum of all numbers along its path.

Note: Movements can only be either down or right at any point in time.

Example:

Input:

  [
    [1,3,1],
    [1,5,1],
    [4,2,1]
  ]

Output:

7

Explanation:

Because the path 1 → 3 → 1 → 1 → 1 minimizes the sum.

Try it yourself

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

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