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Det framgår av uppgiftsbeskrivningen för betyg VG att linjär värstfallstid är "svårt men inte omöjligt", implicit för både uppgift 3.2 och 3.3. Men, enligt https://stackoverflow.com/questions/4168622/computing-the-mode-most-frequent-element-of-a-set-in-linear-time och satser på Wikipedia (Element distinctness problem), bl.a. så finns det ingen lösning som ger värstafallstidskomplexitet O(n).
Den tidigare formuleringen var missvisande, och kan leda till att mycket onödig tid läggs på att försöka hitta en sådan lösning för 3.2. Jag la mycket onödig tid på detta, t.ex. ;P