Codechef Password Recovery

CodeChefRating 2450Open on judge ↗

Chef recently decided a very curious encryption algorithm for CodeChef passwords. He took an N-letter password and found all the possible 2-letter substrings, considering the characters of a password was written in a circle. Thus, for AbcD, he would deduce the following substrings: Ab, bc, cD, DA. Then, some of the substrings were reversed. For example, the set of substrings above could be conver

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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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