这难度标准我就很迷,为什么这种题也能是中等难度啊
#include<stdio.h>
int seven(int a){
if(a%7==0)return 1;
while(a!=0){
if(a%10==7)return 1;
a/=10;
}
return 0;
}
int main(){
int number;
while(scanf("%d", &number) != EOF){
int ans=0;
if(number!=0){
for(int i=1; i<=number; i++){
ans+=seven(i);
}
}
printf("%d\n", ans);
}
}