不会算法超时了20分

#include <bits/stdc++.h>

using namespace std;

int ans(int n){
	int cnt=0;
	while(n){
		cnt += n % 10;
		n /= 10;
	}
	return cnt;
}

int main(){
	long long a,b,minn=1000000005;
	int s,cnt=0;
	cin >> a >> b >> s;
	for(long long i = a;i <= b;i++){
		if(ans(i) == s){
			if(i<minn){
				minn = i;
			}
			cnt++;
		}
	}
	cout << cnt << endl << minn;
	return 0;
}