SAKET AND STRINGS :-please someone explain me the if statement written inside the for loop

#1

#include
#include
using namespace std;
int main()
{
int k=2;

string s="abbbaa";
int left=0,ans=0,co[2]={0};
for(int i=0;i<s.length();i++)
{
    char c=s[i];
   
    co[c-'a']++;
       //not able to understant the logic below this line of code
    if(min(co[0],co[1])>k)
    {
        co[s[left]-'a']--,left++;
        cout<<left;
    }
    else{ans++;}

}cout<<ans;
}

#2

@shubhamgh00 hey shubham who provide you this solution ? Is that your solution?

#3

i solved the question in different approach but it showed run time error in second case.So i looked into many code in doubt section and got this solution but i am not able to understand the logic in if condition.This code was originally written in java.
Please explain me the logic.