Implement strStr() LeetCode Problem | LeetCode Problems For Beginners | LeetCode Problems & Solutions | Improve Problem Solving Skills | LeetCode Problems Java | LeetCode Problems C++
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Leetcode has a huge number of test cases and questions from interviews too like Google, Amazon, Microsoft, Facebook, Adobe, Oracle, Linkedin, Goldman Sachs, etc. LeetCode helps you in getting a job in Top MNCs. To crack FAANG Companies, LeetCode problems can help you in building your logic.
Link for the Problem – Implement strStr()– LeetCode Problem
Implement strStr()– LeetCode Problem
Problem:
Implement strStr().
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
Example 3:
Input: haystack = "", needle = "" Output: 0
Constraints:
0 <= haystack.length, needle.length <= 5 * 104
haystack
andneedle
consist of only lower-case English characters.
Implement strStr() – LeetCode Solutions
class Solution { public: int strStr(string haystack, string needle) { const int m = haystack.length(); const int n = needle.length(); for (int i = 0; i < m - n + 1; i++) if (haystack.substr(i, n) == needle) return i; return -1; } };
class Solution { public int strStr(String haystack, String needle) { final int m = haystack.length(); final int n = needle.length(); for (int i = 0; i < m - n + 1; ++i) if (haystack.substring(i, i + n).equals(needle)) return i; return -1; } }
class Solution: def strStr(self, haystack: str, needle: str) -> int: m = len(haystack) n = len(needle) for i in range(m - n + 1): if haystack[i:i + n] == needle: return i return -1
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