都说小镇的切糕贵

都说小镇的切糕贵
思路：尺取法，双指针

//#pragma GCC optimize(2)
//#pragma GCC optimize(3,"Ofast","inline")
#include
#define int long long
#define fi first
#define se second
#define pb push_back
#define pii pair
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
const int inf=2e18+100;
const int maxn=2e5+100;
char a[maxn];
mapmp;
signed main()
{
	int n;
	cin>>n;
	cin>>(a+1);
	int m=0;
	for(int i=1;i<=n;i++)
	{
		if(mp[a[i]]==0)m++;
		mp[a[i]]=1;
	}
	mp.clear();
	int ans=inf,l=1,r=1,now=1;
	mp[a[1]]=1;
	for(l=1;l<=n;l++)
	{
		while(r