题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
#include<iostream>
#include<vector>
using namespace std;
int main(){
int n;
int count=0;
while(cin>>n){
for(int i=1;i<=n;i++){
if(i%7==0||to_string(i).find('7')!=-1)
count++;
else
continue;
}
cout<<count<<endl;
}
return 0;
}
#include<vector>
using namespace std;
int main(){
int n;
int count=0;
while(cin>>n){
for(int i=1;i<=n;i++){
if(i%7==0||to_string(i).find('7')!=-1)
count++;
else
continue;
}
cout<<count<<endl;
}
return 0;
}