Mission Impossible 2

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This mission is a bit tricky. It's time for some safe cracking. Ethun is given an array $a_1,a_2, ... a_n$ such that $1 \leq a_i \leq n$. Ethan has to choose some numbers from $1$ to $n$ such that there is no $i$ that both $i$ and $a_i$ is chosen. Ethun can crack the safe only with your help. What is the maximum amount of numbers that Ethun can choose? ###Input: - First line contain

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L1 Observation

L2 Technique

L3 Approach

L4 Pseudo-code

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L5 Full solution

L5 unlocks only if you insist twice

solution.cppC++17

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