Given a string str and a character X. The task is to find the total number of sub-strings that contain the character X at least once.
Input: str = “abcd”, X = ‘b’
“ab”, “abc”, “abcd”, “b”, “bc” and “bcd” are the required sub-strings.
Input: str = “geeksforgeeks”, X = ‘e’
Approach: Total number of sub-strings are n * (n + 1) / 2, among them only those sub-strings need to be counted which contain character X. Character X is present in those sub-strings from position of X to the length of the string. For each character before X this sub-string must be counted.
Below is the implementation of the above approach:
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