题解 | #自守数#
import sys
for line in sys.stdin:
n=int(line.strip())
count=0
for i in range(n+1):
if str(i**2).endswith(str(i)):
count+=1
print(count)
import sys
for line in sys.stdin:
n=int(line.strip())
count=0
for i in range(n+1):
if str(i**2).endswith(str(i)):
count+=1
print(count)
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