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;
string str;
int count = 0;
for(int i = 1; i <= n; i++)
{
str = to_string(i);
if(str.find('7') != string::npos|| i % 7 == 0)
{
count++;
}
}
cout<<count;
return 0;
}
// 64 位输出请用 printf("%lld")
