Implement strStr() java solution
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
andneedle
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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