My-LeetCode-Solvings

C# Code Challenges Solved on LeetCode

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28. Find the index of the first Ocurrence in a String

Level:

Language: C#

Topic: String

Unit Tests:

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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.

Constraints:

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