Button Pairs

CodeChefRating 1309Open on judge ↗

Using his tip-top physique, Kim has now climbed up the mountain where the base is located. Kim has found the door to the (supposedly) super secret base. Well, it is super secret, but obviously no match for Kim's talents. The door is guarded by a row of $N$ buttons. Every button has a single number $A_i$ written on it. Surprisingly, more than one button can have the same number on it. Kim recogni

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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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