756840856 2017-04-04 02:53:59
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#include<iostream>
#include<cstdlib>
#include<cstdio>
using namespace std;
int main()
{
int i,j,n,m,t,x,f=0;
scanf("%d%d",&n,&m);
for(i=n;i<=m;i++)
{ t=i;
while(t!=0)
{
x=t%10;
if(x==2)
f++;
t=t/10;
}
}
printf("%d",f);
system("pause");
return 0;
}