Triwizard tournament

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Gryffindor common room has a magical cauldron. It is initially empty. Any gryffindor can put any number of feathers in that cauldron every morning. The next morning, each feather grows into two feathers. Gryffindors wants exactly $x$ feathers in the cauldron to unlock the next riddle in the triwizard tournament. What is the minimum number of feathers they need to put in a cauldron in total to achi

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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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