394. Count Commas in Range
EasyMath
You are given an integer n. Return the total number of commas used when writing all integers from [1, n] (inclusive) in standard number formatting. In standard formatting: - A comma is inserted after every three digits from the right. - Numbers with fewer than 4 digits contain no commas.
Examples
Input: 1002
Output: 3
Explanation: "1,000", "1,001", and "1,002" each contain one comma → 3 total.
Constraints
- 1 <= n <= 10^5
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