Substrings of Size Three with Distinct Characters

<-E 1876> Substrings of Size Three with Distinct Characters

class Solution {
public:
    int countGoodSubstrings(string s) {
        
        if(s.size() < 3)
            return 0;
        
        int ans = 0;
        
        for(int i = 0; i < s.size() - 2; i++)
        {
            if(s[i] != s[i+1] && s[i+1] != s[i+2] && s[i] != s[i+2])
                ans++;
        }
        
        return ans;
    }
};