mediumStringsPattern: Mixed
Substring Pattern Frequency Solution
Problem Statement
Given a string `sequence` and a substring `pattern`, determine the total count of occurrences of `pattern` within `sequence`, where overlapping occurrences are considered valid.
Examples
Example 1:
Input:{"spaceSignals":"abcabcabc","asteroidSignal":"abc"}
Output:3
Explanation: The asteroid signal 'abc' appears three times in the given string 'abcabcabc' with overlaps allowed
Example 2:
Input:{"spaceSignals":"xyxyxyxy","asteroidSignal":"xy"}
Output:4
Explanation: The asteroid signal 'xy' appears four times in the given string 'xyxyxyxy' with overlaps allowed
Constraints
- 1 <= length of signal string <= 10^5
- 1 <= length of pattern <= 100
Time: O(n + m) Space: O(m)
The optimized approach involves using the Knuth-Morris-Pratt (KMP) algorithm or the Rabin-Karp algorithm, which are designed for string pattern matching and can handle overlaps efficiently. These algorithms preprocess the pattern to create a lookup table that allows for efficient matching, resulting in a time complexity of O(n + m).
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