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[LeetCode] 28. Find the Index of the First Occurrence in a String 找出字符串中第一个匹配项的下标

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[LeetCode] 28. Find the Index of the First Occurrence in a String 找出字符串中第一个匹配项的下标

[LeetCode] 28. Find the Index of the First Occurrence in a String 找出字符串中第一个匹配项的下标