While working on LeetCode's Pascal's Triangle, I ran into a classic head-scratcher involving Interfaces, Concrete Classes, and Generic Invariance. If you've ever been tripped up by errors like ...
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order, and we only cache the first result it find. Why BFS ? With BFS you can stop as soon as you reach the goal. With DFS you might reach the goal (or memoize any result) via a sub-optimal path. To ...
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