#hash sets

Deduplicate titles across a home page's visible rows
CodingNetflix
▲ 00 solutions
Objects seen on both days by at least two clients
CodingGoogle
▲ 00 solutions
Fewest deletions so a list's first k items avoid another list
CodingGoogle
▲ 00 solutions
Unique Morse code words
CodingAmazon
▲ 00 solutions
Longest sequence whose neighbours differ by less than k
CodingAmazon
▲ 00 solutions
Track missing package IDs from out-of-order arrivals
CodingAmazon
▲ 00 solutions