String and Triplets

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As we know the lockdown gets extended till 3rd May. Tanuj and Sudarshan both are getting bore in the house. After playing ludo and carrom for a long time they wanna play another game. So, Tanuj has a different game for Sudarshan. Tanuj gives a string to Sudarshan which consist of only 3 type of characters that is $'A'$, $'B'$ and $'C'$. Now Sudarshan has to find the number of triplets $(i,

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solution.cppC++17

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