心路歷程：對於\(a_i\)，我們一定要有一次操作使得\(l_j=i,l_{j+1}=a_i\)，於是連邊\((i,a_i)\)，不難發現形成基環樹森林，再對著樣例模擬一下，不難發現官方題解的結論
Cyclic Operations
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