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)