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Substrings with similar first and last characters
Basic Accuracy: 37.66% Submissions: 329 Points: 1

Given string s, the task is to find the count of all substrings which have the same character at the beginning and end.

Example 1:

Input: s = "abcab"
Output: 7
Explanation: a, abca, b, bcab, 
c, a and b

Example 2:

Input: s = "aba"
Output: 4
Explanation: a, b, a and aba

User Task:
Your task is to complete the function countSubstringWithEqualEnds() which takes a single string as input and returns the count. You do not need to take any input or print anything.

Expected Time Complexity: O(|str|)
Expected Auxiliary Space: O(constant)

Constraints:
1 <= |s| <= 104

s contains lower case english alphabets

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Substrings with similar first and last characters

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