题解 | #与7无关的数#

#include<stdio.h>
using namespace std;
int main(){
    int n,sum;
    while(scanf("%d", &n) != EOF){
        sum = 0;
        for(int i = 0;i <= n;++i){
            if(0 == i%7){
                sum = sum;
            }
            else if(7 != i%10 && 7 != i/10){
                sum = sum + (i*i);
            }
        }
        printf("%d\n",sum);
    }
}