Given a matrix, find the minimal path sum from the top left to the bottom right by only moving to the right and down.
For example,
x=[ 2 2 2 2 2
10 10 10 1 2
20 20 20 1 2
30 30 30 30 2]Here, the minimum path sum is 14 [ 2+2+2+2+1+1+2+2 ]
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