Check if One String Swap Can Make Strings Equal

class Solution {
public:
    bool areAlmostEqual(string s1, string s2) {
        int i = -1, j = -1;
        int cnt = 0;

        for (int k = 0; k < s1.length(); k++) {
            if (s1[k] != s2[k]) {
                cnt++;
                if (i == -1) {
                    i = k;
                } else if (j == -1) {
                    j = k;
                }
            }
        }

        if (cnt == 0) {
            return true;
        } else if (cnt == 2 && s1[i] == s2[j] && s1[j] == s2[i]) {
            return true;
        }

        return false;
    }
};