席一鸣 2014-09-14 04:34:14
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#include<cstdio>
#include<cstring>
#include<iostream>
using namespace std;
main()
{
char s[10];
int a,b,i,j,sum=0;
cin>>a>>b;
for(i=a;i<=b;i++)
{
sprintf(s,"%d",i);
for(j=0;j<strlen(s);j++)
if(s[j]=='2')
sum++;
}
cout<<sum;
}