1556. Thousand Separator

Given an integer n, add a dot (".") as the thousands separator and return it in string format.

Example 1:

Input: n = 987
Output: "987"

Example 2:

Input: n = 1234
Output: "1.234"

Example 3:

Input: n = 123456789
Output: "123.456.789"

Example 4:

Input: n = 0
Output: "0"

Constraints:

• 0 <= n < 2^31

# @lc code=start
using LeetCode

function thousand_separator(n::Int)
    s = string(n)
    r = length(s) % 3
    ed = 0
    if r == 0
        r += 3
        ed += 1
    end
    res = s[1:r]
    for i in 1 : length(s) ÷ 3 - ed
        res *= "." * s[r + i * 3 - 2 : r + i * 3]
    end
    res
end
# @lc code=end

thousand_separator (generic function with 1 method)

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