题解 | 记数问题
记数问题
https://www.nowcoder.com/practice/28b2d9f2bf2c48de94a1297ed90e1732
#include <stdio.h>
int fun(int n,int x){
int count=0;
while(n){
if(n%10==x){
count++;
}
n=n/10;
}
return count;
}
int main() {
int n,x,sum=0;
scanf("%d %d",&n,&x);
for(int i=1;i<=n;i++){
sum+=fun(i,x);
}
printf("%d",sum);
return 0;
}