题解 | #自守数#
自守数
https://www.nowcoder.com/practice/88ddd31618f04514ae3a689e83f3ab8e
import math
n = int(input())
count = 0
for i in range(n + 1):
s = pow(i, 2)
tail = int(str(s)[-len(str(i)):])
if i == tail:
count += 1
print(count)
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