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Practical Exams Revision

You must have forgotten the practicals performed during this semester due to the break in studies because of the unforeseen Quarantine Break. But the practical exams are yet to come. You have to prepare for it and perform all the practicals in order to score well in semester exams. You decide to go to the Lab and try those practicals but the lab is locked. The key is with the department guard a

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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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