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