打卡记录

第 N 位数字（找规律）

链接

class Solution:
    def findNthDigit(self, n: int) -> int:
        count, digit, start = 9, 1, 1
        while n > count:
            n -= count
            digit += 1
            start *= 10
            count = start * 9 * digit
        num = start + (n - 1) // digit
        return int(str(num)[(n - 1) % digit])