in-place permutation of a array follows this rule
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Published on 2010-06-17T15:16:27Z
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2010/06/17
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algorithm
Suppose there is an array, we want to find everything in the odd index, and move it to the end. Everything in the even index move it to the beginning. The relative order of all odd index items and all even index items are preserved. Suppose the values of the array, a[i] = i, n is even. Then we have.
0,1,2,3,4,5,...,n-1
after the operation
0,2,4,6,...,n-2,1,3,5,7,...,n-1
Can this be done in-place and in O(n) time?
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