I think that with this kind of problem, you can process in two steps.
A first easy problem with small N (to test perms for example). And a harder problem with big N, which
oblige to find another algorithm.
Counting in Finnish
Reverse the Words (not letters) of a String
Rotate a Matrix
Kurchan 4x4 - Optimal score
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Give me Hamming on five, hold the mayo
Still more miles to go before I sleep
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