题解 | #自守数#
自守数
https://www.nowcoder.com/practice/88ddd31618f04514ae3a689e83f3ab8e?tpId=37&tqId=21322&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=99
n = int(input())
count = 0
# 用于取余
mod = 10
for i in range(n+1):
if mod < i:
mod *= 10
if i ** 2 % mod == i:
count += 1
print(count)
查看14道真题和解析