A_Comparison.cpp

/*

||-------------------------------||
||      Mohiul Islam Miraz       ||
||-------------------------------||

*/

#include <bits/stdc++.h>
#define push                      \
    ios_base::sync_with_stdio(0); \
    cin.tie(NULL);
#define sac sort(v.begin(), v.end())
#define sdc sort(v.begin(), v.end(), greater<int>())
#define f1 bool flag = true
#define f0 bool flag = false
#define c0 int count = 0
#define c1 int count = 1
#define s0 long long sum = 0
#define a0 int ans = 0
#define ll long long
#define yes cout << "YES" << endl
#define no cout << "NO" << endl
#define minus cout << -1 << endl
#define cnt cout << count << endl
#define sm cout << sum << endl
using namespace std;

int main()
{
    push;
    int t;
    cin >> t;

    while (t--)
    {
        int n;
        cin >> n;

        string s;
        cin >> s;

        c0;
        a0;

        for (int i = 0; i < n - 1; i++)
        {
            if (s[i] != s[i + 1])
            {
                count = 0;
            }
            else count++;

            ans = max(ans, count);
        }
        cout << ans + 2 << endl;
    }

    return 0;
}