Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right, which minimizes the sum of all numbers along its path.
Note: You can only move either down or right at any point in time.
\n\n\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2020/11/05/minpath.jpg\")
\n\nInput: grid = [[1,3,1],[1,5,1],[4,2,1]]\nOutput: 7\nExplanation: Because the path 1 → 3 → 1 → 1 → 1 minimizes the sum.\n\n\n
Example 2:
\n\n\nInput: grid = [[1,2,3],[4,5,6]]\nOutput: 12\n\n\n
\n
Constraints:
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