题解 | #自守数#
自守数
https://www.nowcoder.com/practice/88ddd31618f04514ae3a689e83f3ab8e
n = int(input().strip())
count = 0
for i in range(n+1):
squ = i ** 2
str_i = str(i)
str_squ = str(squ)
j = len(str_i) - 1
k = len(str_squ) - 1
is_true = True
while j >= 0:
if str_i[j] == str_squ[k]:
j -= 1
k -= 1
continue
else:
is_true = False
break
if is_true:
count += 1
print(count)
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