In problems like the 15 Tile Problem or Larry's Array problem, we use inversions in the array as a method to solve.
But what's the principle behind this method and how do I know when to use inversions?
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$\begingroup$ What do you mean by "inversions in an array"? $\endgroup$– nir shaharSep 14 at 11:23
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1$\begingroup$ practice.geeksforgeeks.org/problems/… $\endgroup$– Yuvraj SakshithSep 14 at 11:29
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2$\begingroup$ en.wikipedia.org/wiki/Parity_of_a_permutation $\endgroup$– Yuval FilmusSep 14 at 13:02
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