题解 | #自守数#
自守数
https://www.nowcoder.com/practice/88ddd31618f04514ae3a689e83f3ab8e
n=int(input())
def check(n):
ns=str(n)
nns=str(n*n)
if int(nns[len(nns)-len(ns):])==n:
return 1
else:
return 0
ans=0
for i in range(n+1):
if check(i):
ans+=1
print(ans)
