Dev Skill Hide and Seek

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//Accepted
#include<cstdio>
#include<cstring>
#include<cmath>
#include<map>
#include<vector>

using namespace std;

#define fast ios_base::sync_with_stdio(false)
#define bfast cin.tie(0)
#define outs(x) cout << x << " "
#define outn(x) cout << x << "\n"
#define sf scanf
#define pf printf
#define nl puts("")
#define psb push_back

typedef long long LL;
typedef vector<int>vii;
typedef vector<LL>vll;
typedef map<char, bool>mpcb;

const int mod = 1000007;
const int high = 100003;
const int inf = 100000005;

char s[high];
mpcb mp;
int ans=inf;

void whole(int len)
{
    int i=1 , st=1 , cnt=0;

    mp['F']=mp['M']=mp['J']=mp['T']=false;

    while(i<=len)
    {
        if(!mp[s[i]])
        {
            cnt++;

            mp[s[i]] = true;

            if(cnt == 4)
            {
                cnt=0;
                mp['F']=mp['M']=mp['J']=mp['T']=false;
                ans = min(ans, (i - st + 1));
                st=i+1;
            }
        }

        i++;
    }
}

void rev(int len)
{
    int i=len , st=len , cnt=0;

    mp['F']=mp['M']=mp['J']=mp['T']=false;

    while(i>=1)
    {
        if(!mp[s[i]])
        {
            cnt++;

            mp[s[i]] = true;

            if(cnt == 4)
            {
                cnt=0;
                mp['F']=mp['M']=mp['J']=mp['T']=false;
                ans = min(ans, (st - i + 1));
                st=i-1;
            }
        }

        i--;
    }
}

void Left(int b, int mid)
{
    int i=mid , st=mid , cnt=0;

    mp['F']=mp['M']=mp['J']=mp['T']=false;

    while(i>=b)
    {
        if(!mp[s[i]])
        {
            cnt++;

            mp[s[i]] = true;

            if(cnt == 4)
            {
                cnt=0;
                mp['F']=mp['M']=mp['J']=mp['T']=false;
                ans = min(ans, (st - i + 1));
                st=i-1;
            }
        }

        i--;
    }

    i=b , st=b , cnt=0;

    mp['F']=mp['M']=mp['J']=mp['T']=false;

    while(i<=mid)
    {
        if(!mp[s[i]])
        {
            cnt++;

            mp[s[i]] = true;

            if(cnt == 4)
            {
                cnt=0;
                mp['F']=mp['M']=mp['J']=mp['T']=false;
                ans = min(ans, (i - st + 1));
                st=i+1;
            }
        }

        i++;
    }
}

void Right(int mid, int e)
{
    int i=e , st=e , cnt=0;

    mid++;

    mp['F']=mp['M']=mp['J']=mp['T']=false;

    while(i>=mid)
    {
        if(!mp[s[i]])
        {
            cnt++;

            mp[s[i]] = true;

            if(cnt == 4)
            {
                cnt=0;
                mp['F']=mp['M']=mp['J']=mp['T']=false;
                ans = min(ans, (st - i + 1));
                st=i-1;
            }
        }

        i--;
    }

    i=mid , st=mid , cnt=0;

    mp['F']=mp['M']=mp['J']=mp['T']=false;

    while(i<=e)
    {
        if(!mp[s[i]])
        {
            cnt++;

            mp[s[i]] = true;

            if(cnt == 4)
            {
                cnt=0;
                mp['F']=mp['M']=mp['J']=mp['T']=false;
                ans = min(ans, (i - st + 1));
                st=i+1;
            }
        }

        i++;
    }
}

int main()
{
    int t , n , i , len, cnt=0, st=0;

    sf("%d", &t);

    while(t--)
    {
        ans = inf;

        mp['F']=mp['M']=mp['J']=mp['T']=false;

        sf("%d", &n);
        getchar();

        for(i=1; i<=n; i++)
        {
            sf("%c", &s[i]);
        }

        whole(n); //cerr << ans << "\n";
        rev(n); //cerr << ans << "\n";
        Left(1, n/2); //cerr << ans << "\n";
        Left(1, (n/2)+1);
        Left(1, (n/2)-1);
        Left(1, (n/2)+4);
        Right((n/2)+1, n); //cerr << ans << "\n";
        Right((n/2), n);
        Right((n/2)-1, n);
        Right((n/2)+4, n);

        pf("%d\n", ans);
    }

    return 0;
}

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