문제 Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Input: haystack = "hello", needle = "ll" Output: 2Example 2: Input: haystack = "aaaaa", needle = "bba" Output: -1Clarification: 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 ..
