题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
#include <iostream>
#include <string>
using namespace std;
int main() {
int n;
cin>>n;
int count = 0;
for(int i =7;i<=n;i++){
if(i%7==0){
count++;
}
else if (to_string(i).find('7')!=std::string::npos) {
count++;
}
}
cout<<count;
return 0;
}
// 64 位输出请用 printf("%lld")
