Web Reference: Jul 23, 2025 ยท A substring is a contiguous part of a string, i.e., a string inside another string. In general, for an string of size n, there are n* (n+1)/2 non-empty substrings. Given a string S made of letters a, b and c, find the number of sub strings that do not contain all the letters a, b and c. That is the number of sub strings that do not contain at least one of the letters a or b or c. Welcome to our comprehensive guide on strategies for tackling substring and subsequence problems in coding interviews and algorithmic challenges.
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