We are given a string S, we need to find count of all contiguous substrings starting and ending with same character.
Input : S = "abcab" Output : 7 There are 15 substrings of "abcab" a, ab, abc, abca, abcab, b, bc, bca bcab, c, ca, cab, a, ab, b Out of the above substrings, there are 7 substrings : a, abca, b, bcab, c, a and b. Input : S = "aba" Output : 4 The substrings are a, b, a and aba
We have discussed different solutions in below post.
In this article, a simple recursive solution is discussed.
The time complexity of above solution is exponential. In Worst case, we may end up doing O(3n) operations.
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