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leetcode 374

leetcode 387QuestionFirst Unique Character in a StringGiven a string, find the first non-repeating character in it and return it’s index. If it doesn’t exist, return -1.Examples:s = “leetcode” return

leetcode 001QuestionTwo SumGiven an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution. Ex

leetcode 7