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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- ll a,c,d,e,i,j,k,l;
- string x;
- cin>>a>>c>>x;
- d=e=k=l=0;
- for(i=0;i<a;i++)
- {
- if(x[i]=='a') d++;
- else e++;
- if(min(d,e)>c)
- {
- if(x[k]=='a') d--;
- else e--;
- k++;
- }
- else l=max(l,d+e);
- }
- cout<<l<<endl;
- return 0;
- }
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