Submission #23839033

---

Source Code Expand

#include <bits/stdc++.h>
//#include <atcoder/all>
#define endl "\n"
using namespace std;
typedef long long ll;
typedef pair<ll, ll> l_l;
typedef pair<int, int> i_i;
template<class T>
inline bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
inline bool chmin(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }
    return false;
}

const long long INF = 1e18;
//const ll mod = 1000000007;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll N;
    string S;
    cin >> N >> S;
    if(S[0] != S[N-1]) {
        cout << 1 << endl;
        return 0;
    }
    char c = S[0];
    for(int i = 0; i + 1 < N; i++) {
        if(S[i] != c and S[i+1] != c) {
            cout << 2 << endl;
            return 0;
        }
    }
    cout << -1 << endl;
    return 0;
}

Submission Info

Judge Result