Memory optimisation #2
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Only the current and the previous rows are needed. This trick is a great improvement for long texts: it reduces space from O(mn) to O(n). (It could be still slightly improved to O(min(m,n)) by swapping the two texts.)
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Hits 113 113
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Only the current and the previous rows are needed. This trick is a great improvement for long texts: it reduces space from O(mn) to O(n).
In a latter commit it could be slightly improved to O(min(m,n)) by swapping the two texts when needed.