求同构数输入数据上限与下限结果不对

#include<stdio.h>

int main()

{

int m,n,t,i,j,count=0,l,sum=1,a=0;

scanf("%d%d",&m,&n);

if(m>n){t=m;m=n;n=t;}

for(i=m;i<=n;i++)

{j=i;

do{

  count++;

   j=j/10; }while(j!=0);

for(l=1;l<=count;l++)

{sum=10*sum;}

if((i*i)%sum==i)

{printf("%d\n",i);

a++;}}

if(a==0)

printf("No Answer");

return 0;

}