Yet another SOD problem

CodeChefRating 1459Open on judge ↗

Ujan is a software developer. He is developing a software that takes two integers $L$ and $R$ and outputs the count of integers in the sequence $L,L+1,\ldots,R-1,R$ whose sum of digits (SOD) is divisible by $3$. He has developed the user interface (UI) quite easily. He is having a hard time finding the logic to solve the problem. As you are not only a good friend of Ujan but also a good problem

HINT LADDERno hints yet

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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