Write a routine that does secret santa in O(N) time.
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Giving you a starting position on a chessboard. Giving you an end position. If you are only allowed to walk diagonally, how many steps do you need to take to get to the end position?
How would you pick the middle element of a list
Write a piece of code to find the square root of a number.
Most efficient way to find the most frequent number (0-255) in a string of numbers
Merge to sorted arrays into second array, both arrays has N elements, but second array size is N * 2. So you merge both arrays in second array in a sorted way.
You have 4 aces and a king in a set of cards, what's the probability of get kind before all aces.
The second question is that there are 8 buttons, 7 of them are some, one is a bit little heavier, and you have a balance, how could find the heavier one, you can just use the balance twice.
How do you find the middle of a linked list, rounding up in the case of an odd number of items but with no differentiation between an even or odd number?
Design a stack that has an O(1) max() method.
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