题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
n=int(input())
l1=list(range(1,n+1))
l2=[]
c=0
for i in range(len(l1)):
if l1[i]%7==0:
c+=1
l1[i]=-1
for i in l1:
s=set(str(i))
l2.append(s)
for i in l2:
if "7" in i:
c+=1
print(c)
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