Web Reference: Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Output: 2. Example 2: Output: -1. Clarification: What should we return when needle is an empty string? This is a great question to ask during an interview. 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 (). Solution Approach 1: Scan the haystack to match the needle. Code (Python) Approach 1: 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 (). * @param {string} haystack. * @param {string} needle. * @return {number} */ Complexity:
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