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Challenges with a spec which requires all answers to meet certain time complexity restrictions. This could be specific ("Your answer must be O(n^2) where n is the number of items in the input"), or at the level of complexity classes ("Your answer must be polynomial in the number of items in the input").
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Permutation Square Root
In math, a permutation σ of order n is a bijective function from the integers 1...n to itself. This list:
2 1 4 3
represents the permutation σ such that σ(1) = 2, σ(2) = 1, σ(3) = 4, and σ(4) = 3.
A …