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answer Every 2nd digit of a long number

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Write code which checks validity of a 3-digit positive integer entered by the user. The number is considered valid (true) if the sum of the first two digits is greater than or equal to the last. Otherwise it is invalid (false).

How to find largest number less than a given number and without a given digit?

Problem Statement For an integer n, let S(n) be the sum of digits in the decimal notation of n. For example, we have S(123) = 1 + 2 + 3 = 6 Given two 3-digit integers A and B, find the greater of S(A) and S(B). Constraints • All values in input are inte