McLemore scored 24 points -- including 10-of-11 from the free-throw line -- and Young had 16 points and eight rebounds for the Jayhawks (7-1), who have won six straight games.
Elijah Johnson scored 11 points for Kansas and Travis Releford scored 10.
Josh Scott and Askia Booker teamed for 34 points for Colorado (7-2).
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