Alternative concatenation UNION(X, y)could instead concatenate the lists containing y and x, and update the rep pointers for all elements in the list containing x rep :x十 rep reps s:[ reps, c 2001 by erik D. Demaine Introduction to Agorithms Day33L20.10© 2001 by Erik D. Demaine Introduction to Algorithms Day 33 L20.10 Alternative concatenation Sx : x1 x2 rep[Sy] UNION(x, y) could instead • concatenate the lists containing y and x, and • update the rep pointers for all elements in the list containing x. y1 y2 y3 rep rep[Sx] rep Sy :