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676C.cpp
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676C.cpp
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#include<bits/stdc++.h>
using namespace std;
#define ll long long int
int main()
{
ll n,m;
cin >> n >> m;
string s;
cin >> s;
ll temp = 0;
ll i = 0;
ll j = 0;
ll ans = 0;
while( i < n && j < n)
{
while(j < n && temp <=m)
{
if(s[j] == 'b')
{
temp++;
if(temp > m)
break;
}
j++;
}
ans = max(ans , j - i);
while( i <= j && temp > m)
{
if(s[i] == 'b')
temp --;
i++;
}
j++;
}
i = 0;
j = 0;
temp = 0;
while( i < n && j < n)
{
while(j < n && temp <=m)
{
if(s[j] == 'a')
{
temp++;
if(temp > m)
break;
}
j++;
}
ans = max(ans , j - i);
while( i <= j && temp > m)
{
if(s[i] == 'a')
temp --;
i++;
}
j++;
}
cout << ans << endl;
}