How to Solve Count Number of Homogenous Substrings Problem
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Count Number of Homogenous Substrings
Given a string s, return the number of homogenous substrings of s. Since the answer may be too large, return it modulo 109 + 7. A string is homogenous if all the characters of the string are the same....
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Understanding the Count Number of Homogenous Substrings Problem
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Problem Statement
Given a string s, return the number of homogenous substrings of s. Since the answer may be too large, return it modulo 109 + 7. A string is homogenous if all the characters of the string are the same. A substring is a contiguous sequence of characters within a string.
Count Number of Homogenous Substrings
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Examples
s = "abbcccaa"13The homogenous substrings are listed as below: "a" appears 3 times. "aa" appears 1 time. "b" appears 2 times. "bb" appears 1 time. "c" appears 3 times. "cc" appears 2 times. "ccc" appears 1 time. 3 + 1 + 2 + 1 + 3 + 2 + 1 = 13.
s = "xy"2The homogenous substrings are "x" and "y".
s = "zzzzz"15Constraints
1 <= s.length <= 105s consists of lowercase letters.How Interview Coder Helps with Leetcode Problems
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