Leetcode 2950. Number of Divisible Substrings

Count how many substrings of a given digit string represent base-10 numbers divisible by a given integer p. Solve by using modular arithmetic / rolling remainders (tracking prefix remainders with powers of 10, and handling small-special-case divisors like 2 or 5) to avoid constructing large integers and achieve linear-time counting.

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Leetcode 2950. Number of Divisible Substrings

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