Submission #2227799

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Source Code Expand

#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N; cin >> N;
    string S; cin >> S;
    string T;
    T += 'b';
    if (S == T) {
        cout << 0 << endl;
        return 0;
    }
    REP(n, 1, N) {
        if (n % 3 == 1) T = 'a' + T + 'c';
        if (n % 3 == 2) T = 'c' + T + 'a';
        if (n % 3 == 0) T = 'b' + T + 'b';
        if (S == T) {
            cout << n << endl;
            return 0;
        }
    }
    cout << -1 << endl;

    return 0;
}

Submission Info

Judge Result