题解 | #自守数#
自守数
https://www.nowcoder.com/practice/88ddd31618f04514ae3a689e83f3ab8e
def f(x):
if str(x*x)[-len(str(x)):] == str(x):
return True
return False
n = int(input())
c = 0
for i in range(n+1):
if f(i):
c += 1
print(c)
