I hope merge sort is not an inplace sorting.. It'll take extra space (in function merge) and since it uses recursion it'll also take stack space.. I think this sol will work. 1. partition the array by holding the even elements on first space(n/2 or n/2-1 depends on odd sized and even sized array) of array and odd elements in last n/2 space of array. 2. Do heapsort by using both min heap and maxheap by having 0 and (sizeof even elements) as root of heap. 3. Heap don't use extra space and time complexity is O(nlgn).
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