2025-12-26 14:01:28 +0300 MSK

class Solution:
    def bestClosingTime(self, customers: str) -> int:
        j, min_pen = len(customers), customers.count("N")
        cur_pen = min_pen
        for i in reversed(range(len(customers))):
            if customers[i] == "Y":
                cur_pen += 1
            else:
                cur_pen -= 1
            if cur_pen <= min_pen:
                j, min_pen = i, cur_pen
        return j