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1 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABXWPPVPDPCYZP partitioned partition elementunpartitioned pq

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2 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABXWPPVPDPCYZP pq

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3 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABXWPPVPDPCYZP pq

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4 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABXWPPVPDPCYZP pq swap me

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5 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABXWPPVPDPCYZP pq swap me

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6 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABXWPPVPDPCYZP pq swap me

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7 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABXWPPVPDPCYZP pq swap me

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8 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABCWPPVPDPXYZP pq

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9 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABCWPPVPDPXYZP pq swap me

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10 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABCWPPVPDPXYZP pq swap me

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11 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. ABCPPPVPDWXYZP pq swap left

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12 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PBCAPPVPDWXYZP pq

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13 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PBCAPPVPDWXYZP pq swap me

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14 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PBCAPPVPDWXYZP pq swap me

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15 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PBCADPVPPWXYZP pq swap right

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16 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PBCADPVPZWXYPP pq

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17 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PBCADPVPZWXYPP pq swap me

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18 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PBCADPVPZWXYPP pq swap me

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19 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PBCADPVPZWXYPP pq swap left

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20 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PPCADBVPZWXYPP q swap right p

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21 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PPCADBVYZWXPPP pq

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22 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PPCADBVYZWXPPP pq swap me

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23 3-Way Partitioning 3-way partitioning. n Choose partitioning element. n Scan from left element. n Scan from right for element. n Exchange. n Move to left or right end if equal. n Repeat until pointers cross. PPCADBVYZWXPPP pq pointers cross

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24 3-Way Partitioning 3-way partitioning. n Swap elements on left with elements in middle. n Swap elements on right with elements in middle. PPCADBYZWXPPP pq swap me V

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25 3-Way Partitioning 3-way partitioning. n Swap elements on left with elements in middle. n Swap elements on right with elements in middle. BPCADPYZWXPPP pq swap me V

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26 3-Way Partitioning 3-way partitioning. n Swap elements on left with elements in middle. n Swap elements on right with elements in middle. BDCAPPYZWXPPP pq V

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27 3-Way Partitioning 3-way partitioning. n Swap elements on left with elements in middle. n Swap elements on right with elements in middle. BDCAPPYZWXPPP pq swap me V

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28 3-Way Partitioning 3-way partitioning. n Swap elements on left with elements in middle. n Swap elements on right with elements in middle. BDCAPPPYZWXPPV pq swap me

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29 3-Way Partitioning 3-way partitioning. n Swap elements on left with elements in middle. n Swap elements on right with elements in middle. BDCAPPPPZWXPYV pq swap me

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30 3-Way Partitioning 3-way partitioning. n Swap elements on left with elements in middle. n Swap elements on right with elements in middle. BDCAPPPPPWXZYV pq 3-way partitioned!

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