Lazy Stream Videos Links

Black Box Method https://youtu.be/RDzsrmMl48I
mentioned online CH implementation discussion https://codeforces.com/blog/entry/51275
MEX https://youtu.be/JDuVLyKn7Yw
SCC https://youtu.be/wUgWX0nc4NY
Rachit, approaching interview qs https://youtu.be/hZkb_Dqu7YY