题解 | #与7无关的数#

#include <cstdio>
int RelateSeven(int n){
    int sum = 0;
    for(int i = 0; i <= n; i++){
        if(i % 7 != 0 && i % 10 != 7){
            sum += i * i;
        }
    }
    return sum;
}
int main(){
    int n;
    int sum = 0;
    scanf("%d",&n);
    if(n < 100){
        sum = RelateSeven(n);
    }
    printf("%d\n",sum);
}