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1926C - Влад и сумма сумм цифр i couldn't find optimal solution in the contest for this problem so after the contest i looked at editorial and it was actually easy. but i tried some submissions and i get TLE 2.
247790985 please look at this submission which i get tle 2
Precompute the sum from 1 to 2e5 and then run your test cases and you will get your answer in O(1).
thank you very much!