387. First Unique Character in a String

Given a string, find the first non-repeating character in it and return its index. If it doesn't exist, return -1.

Examples:

s = "leetcode"
return 0.

s = "loveleetcode"
return 2.

Note: You may assume the string contains only lowercase English letters.

# @lc code=start
using LeetCode

function first_unique_char(s::String)::Int
    table = Dict{Char,Bool}()
    for i in s
        table[i] = !haskey(table, i)
    end
    for (i, st) in enumerate(s)
        table[st] && return i
    end
    -1
end

# @lc code=end

first_unique_char (generic function with 1 method)

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