Implement strStr() java solution

 Implement strStr() java solution

Implement strStr()


Implement strStr().

Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

Clarification:

What should we return when needle is an empty string? This is a great question to ask during an interview.

For the purpose of this problem, we will return 0 when needle is an empty string. This is consistent to C's strstr() and Java's indexOf().

 

Example 1:

Input: haystack = "hello", needle = "ll"
Output: 2

Example 2:

Input: haystack = "aaaaa", needle = "bba"
Output: -1

 

Constraints:

  • 1 <= haystack.length, needle.length <= 104
  • haystack and needle consist of only lowercase English characters.

Solution:

class Solution {
    public int strStr(String haystack, String needle) {
     if(needle=="")
         return 0;
     if(haystack.contains(needle))
         return haystack.indexOf(needle);
        else
            return -1;
    }
}

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