I imagine there's entire companies in existence now, whose entire value proposition is clean human-generated data. At this point, the Internet as a data source is entirely and irrevokably polluted by large amounts of ducks and various other waterfowl from the Anseriformes order.
If it doesn’t work for you on l33t code problems, what techniques are you finding more effective in that case?
As a concrete example, there is a class of problems that are well served by dynamic programming. So we would review specific examples like Dijkstra's algorithm for shortest path. Or Wagner–Fischer algorithm for Levenshtein-style string editing. But we would also learn, often via these concrete examples, of how to classify and structure a problem into a dynamic programming solution.
I have no idea if this is what is meant by "l33t code solutions", but I thought it would be a helpful response anyway. But the bottom line is that these are not common in industry, because hard computer science is not necessary for typical business problems. The same way you don't require material sciences advancements to build a typical house. Instead it flows the other way, where advancements in materials sciences will trickle down to changing what the typical house build looks like.