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- Number of bit to be flipped to convert one number to another.
- Separate even and odd integers in a given array
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- All elements appears thrice and one element appears once. Find that element in O(n) time and O(1) space
- Separate 0’s and 1’s in a given array
- Find local minimum or local maximum in O(1).
- Find three elements in an array that sum to a given value

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