Problem 512. Spot the rectangle
This problem is related to the 17x17 challenge. Given a matrix filled with ones and zeros, determine whether or not any rectangles are present. A rectangle is a formed whenever four ones appear in the corners of a rectangular region of the matrix.
You can't form any rectangles here.
There is a rectangle: a([1 3],[1 3]) is [1 1; 1 1]
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