Top-Down vs Bottom-Up
In this lesson, we will look at the pros and cons of top-down dynamic programming and bottom-down dynamic programming.
We'll cover the following
Comparison
Both top-down dynamic programming and bottom-up dynamic programming have their own pros and cons. Knowing these pros and cons can help you choose the algorithm’s design approach based on your problem’s requirements.
Operation | Top-Down | Bottom-Up |
---|---|---|
Ease of problem formulation | ✅ It is easier to formulate a problem in top-down dynamic programming because of its recursive nature | Thinking about a problem in a bottom-up manner can be slightly less intuitive |
Stack management | Stack memory can quickly explode in top-down algorithms, thus making them less practical for larger inputs | ✅ In bottom-up algorithms, stack memory is never an issue because there are no recursive calls |
Cost of recursion | Recursive calls can entail a lot of computation cost | ✅ There is no excessive computation cost due to recursive calls |
Code readability | ✅ Top-down algorithms are typically much easier to read and comprehend | Bottom-up algorithms can sometimes be difficult to grasp |
Subproblems solved | ✅ In top-down algorithms, we only evaluate a result on ad-hoc basis, i.e., when it is needed, meaning results that are not needed are never evaluated | Since we evaluate results in order starting from smallest to the largest, we may end up evaluating results that are not needed |
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