people sit in a row. Couples are numbered . Find the minimum swaps to seat every couple together. For , one swap gives . Answer is .
Here's a cycle-counting problem disguised as greedy.
Think about the relationship between people and positions.
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
$ curl repovive.com/roadmaps/greedy-algorithms/greedy-optimization/problem-couples-holding-hands
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