Given a string str of n lowercase characters, the task is to count the number of substrings of str starting with character X and ending with character Y.
Input: str = "abbcaceghcak" x = 'a', y = 'c' Output: 5 abbc, abbcac, ac, abbcaceghc, aceghc Input: str = "geeksforgeeks" x = 'g', y = 'e' Output: 6
- Initialize two counters i.e. tot_count to count the total number of substrings and count_x to count the number of strings that start with X.
- Start traversing the string.
- If the current character is X then increment the count of count_x.
- If the current character is Y, it means a string ends at Y so increment the count of tot_count i.e.
tot_count = tot_count + count_x
It means that if there exists a Y then it will make a substring with all the X occurs before Y in the string. So, add the count of X to the total count.
- Return total count.
Below is the implementation of above approach:
Count = 5
- Number of substrings with count of each character as k
- Count substrings with each character occurring at most k times
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- Count of strings that can be formed from another string using each character at-most once
- Count occurrences of a character in a repeated string
- Count of character pairs at same distance as in English alphabets
- Find if a string starts and ends with another given string
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