leetcode solutions

[Vandivier]

we have the leetcode kata article, but currently folks are expected to browse around and find a solution out there on the internet.

this kind of works because everything has been solved before, but the answers people run into are of highly varied quality in the code and the surrounding explanantion

let's contribute officially recommended solutions with high-quality explanations (prefer comments in the code, as if it were explained during an interview)

this issue can be split into many sub issues as helpful.

[Vandivier]

3Sum no-sort: https://leetcode.com/problems/3sum/solutions/4622219/python3-no-sort-with-top-20-performance/

[Vandivier]

3Sum standard two pointers: https://leetcode.com/problems/3sum/solutions/4624993/3sum-standard-two-pointers-approach/

[TISHARP]

3Sum without using divide and conquer dynamic programming methods: https://leetcode.com/problems/3sum/solutions/5122359/3sum-less-dynamic-solution-beats-99-7-of-python-solutions

[Vandivier]

https://leetcode.com/problems/course-schedule/solutions/5254834/concise-topological-bfs/