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C.cpp
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C.cpp
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#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
#define pb push_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define ff first
#define ss second
#define rep(i, a, b) for(int i = a; i < b; i++)
#define repR(i, a, b) for(int i = a; i >= b; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int)(x).size()
#define mem1(a) memset(a,-1,sizeof(a))
#define mem0(a) memset(a,0,sizeof(a))
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define MOD1 1000000007
#define MOD2 998244353
#define INF 2000000000000000000
#define ps(x,y) fixed << setprecision(y) << x
#define fastio ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL)
template <typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//member functions :
//1. order_of_key(k) : number of elements strictly lesser than k
//2. find_by_order(k) : k-th element in the set
int n;
string s;
bool helper(int l, int r)
{
int a = 0, b = 0, c = 0;
rep(i, l, r + 1) {
a += s[i] == 'a';
b += s[i] == 'b';
c += s[i] == 'c';
}
return a > b && a > c;
}
void solve()
{
cin >> n >> s;
int ans = INT_MAX;
rep(i, 0, n) {
for (int j = i + 1; j < min(i + 7, n); j++) {
if (helper(i, j)) {
ans = min(ans, j - i + 1);
}
}
}
if (ans == INT_MAX) cout << -1 << '\n';
else cout << ans << '\n';
}
int main()
{
fastio;
/*#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif*/
int t = 1;
cin >> t;
while (t--) solve();
return 0;
}