Chang and Perfect Quadruples

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Chang was not able to sleep well last night as he was thinking about a problem which still remains unsolved. Since he has only a day left to solve this problem and hand it to the interviewer, you being his friend decide to help him solve this so that he can clear this round and get a much-needed job. The problem is as follows. Given a list L of N integers, Chang defines a perfect quadruple (i, j,

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L1 Observation

L2 Technique

L3 Approach

L4 Pseudo-code

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L5 Full solution

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solution.cppC++17

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