题解 | #自守数#
自守数
https://www.nowcoder.com/practice/88ddd31618f04514ae3a689e83f3ab8e
def istarget(x):
if str(x ** 2)[-len(str(x)) :] == str(x):
return True
return False
n = int(input())
count = 0
for i in range(n + 1):
if istarget(i):
count += 1
print(count)