sales holds a shop's daily takings. A day is record-breaking if its takings are strictly greater than every earlier day's takings. The first day is always a record. Return how many record-breaking days there were.
Examples
Input: sales = [3, 1, 4, 4, 5]
Output: 3
Explanation: Days with 3, 4 and 5 set new records; the second 4 only ties.
Input: sales = [9, 8, 7]
Output: 1
Constraints
0 <= len(sales) <= 10**5- Target: O(n) time, O(1) extra space.
Goals
- Count events while tracking a running maximum
- Treat the first element as an automatic record