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Algorithms pattern questions across top companies

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#1042Flower Planting With No AdjacentMediumdepth first searchWalkCCCBloombergVimeo
#1411Number of Ways to Paint N × 3 GridHarddynamic programmingWalkCCCAmazonBloombergCitadel
#886Possible BipartitionMediumdepth first searchWalkCCCAmazonBloombergGoogle
#785Is Graph Bipartite?Mediumdepth first searchWalkCCCAmazonAppleBloomberg
#1931Painting a Grid With Three Different ColorsHarddynamic programmingWalkCCCAmazonBloombergGoogle