class Solution {
public:
    int numberOfSubstrings(string s) {
        int numa = 0,numb = 0,numc = 0,l = 0,r = 0;
        int n = s.size();
        int ans=0;
        if(s[0] == 'a')numa++;
        if(s[0] == 'b')numb++;
        if(s[0] == 'c')numc++;
        while(r<n)
        {
            while(r+1<n&&!(numa&&numb&&numc))
            {
               if(s[r+1] == 'a')numa++;
               if(s[r+1] == 'b')numb++;
               if(s[r+1] == 'c')numc++;
               r++;
            }
            if(numa&&numb&&numc)
            {
               // cout<<l<<" "<<r<<endl;
                ans += n-r;
            }
             else
             {
               break;
             }
             if(s[l] == 'a')numa--;
             if(s[l] == 'b')numb--;
             if(s[l] == 'c')numc--;
             l++;
        }
        return ans;
    }
};