EntityQ33279· pop 13· linked from 12 articlesriver crossing puzzleSign in to saveclass of mental challengesConnectionsvertex coverEntitydigital object identifierEntitygraph theoryEntitygraphEntityJSTOROrganizationAlcuinEntitystream bedEntitydynamic programmingEntitytimelineEntitybipartite graphEntityNP-completeEntitytime complexityEntityRichard E. BellmanEntityNP-hardEntityinteger programmingEntityDavid SingmasterEntityfox, goose and bag of beans puzzleEntityPropositiones ad acuendos juvenesEntitymissionaries and cannibals problemEntityMartin GrötschelEntityCategoriesLogic puzzles