The problem is as follows:
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
.
Example 1:
Input: haystack = "sadbutsad", needle = "sad"
Output: 0
Explanation: "sad" occurs at index 0 and 6.
The first occurrence is at index 0, so we return 0.
Example 2:
Input: haystack = "leetcode", needle = "leeto"
Output: -1
Explanation: "leeto" did not occur in "leetcode", so we return -1.
This is how I solved it:
This is the first easy problem that was actually easy. Just use the built-in index()
function, and that's it!
This is how it works:
- Check if 'needle' is a substring of 'haystack'
- If it is, return the index of the first occurrence of 'needle'
- Else if 'needle' is not found, return -1
if needle in haystack:
return haystack.index(needle)
else:
return -1
This is the completed solution:
class Solution:
def strStr(self, haystack: str, needle: str) -> int:
return haystack.index(needle) if needle in haystack else -1
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