selectionSort: l to: r | m il ir temp | (r > l) ifTrue: [ m := self at: ((l + r) // 2). il := l. ir := r. [ [(self at: il) < m] whileTrue: [il := il + 1.]. [(self at: ir) > m] whileTrue: [ir := ir - 1.]. (il < ir) ifTrue: [ " swap " temp := self at: il. self at: il put: (self at: ir). self at: ir put: temp. ]. ] doUntil: [il >= ir.]. self selectionSort: l to: (il - 1). self selectionSort: (il + 1) to: r. ]. ^self.
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