题解

#include<bits/stdc++.h>
using namespace std;
int a,b,sum;
int main()
{
	cin>>a>>b;
	for(int i=a;i<=b;i++)
	{
		int k=i;
	
	while(k>0)
	{
		sum+=k%10;
		k/=10;
		
		
	}
}
	cout<<sum;
	return 0;
}