what’s wrong with this code?
//#include “iostream”
//#include"string"
//#include"algorithm"
using namespace std;
int main() {
string s;
int k;
cin>>k>>s;
int n=s.length();
int char_counts[26];
int window_start=0;
int max_length=0;
int max_count=0;
for(int window_end=0;window_end<n;window_end++)
{
char_counts[s.at(window_end)-'a']++;
int current_char_count=char_counts[s.at(window_end)-'a'];
max_count=max(max_count,current_char_count);
while(window_end-window_start-max_count+1>k)
{
char_counts[s.at(window_start)-'a']--;
window_start++;
}
max_length=max(max_length,window_end-window_start+1);
}
cout<<max_length;
return 0;
}