Test case #0
Input:    21
Input:    23
Expected: 75
Got:      57

#include <string>
#include <algorithm>
using namespace std;

class NumReverseEasy {
public:
    long long getsum(int A, int B) {
        long long total = 0;
        for (int n = A; n <= B; n++) {
            string s = to_string(n);
            reverse(s.begin(), s.end());
            total += min((long long)n, (long long)stoll(s));
        }
        return total;
    }
};