Given two strings s1 and s2, find if s1 is substring of s2. If yes, return index of first occurrence, else return -1.
Input : s1 = "for", s2 = "geeksforgeeks" Output : 5 String "for" is present as a substring of s2. Input : s1 = "practice", s2 = "geeksforgeeks" Output : -1.
A simple solution is to one by one check every index of s2. For every index, check if s1 is present.
Present at index 5
Time complexity : O(m * n) where m and n are lengths of s1 and s2 respectively.
Language implementations :
- Queries to check if string B exists as substring in string A
- Python | Check if a Substring is Present in a Given String
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- Frequency of a substring in a string
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- Shortest substring of a string containing all given words
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