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"
Constraints:
0 <= n <= 231 - 1
String
Hints
Hint 1
Scan from the back of the integer and use dots to connect blocks with length 3 except the last block.
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