update misc unsolved

Author: Joshua Goller

misc/unsolved.md

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+Problems to revisit
+---
+- Find the number of components in a graph. [HackerRank article](https://www.hackerrank.com/challenges/components-in-graph/problem), [YouTube video](https://www.youtube.com/watch?v=IWvbPIYQPFM)
+- Problems from [this Reddit post complaining about Peloton's interview process](https://www.reddit.com/r/cscareerquestions/comments/9l6vzp/peloton_hackerrank_wtf_rant/)
+- Problems from [this Reddit post about Google's process](https://www.reddit.com/r/cscareerquestions/comments/1z97rx/from_a_googler_the_google_interview_process/)
+- Big word finder