Submission #1318761

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Source Code Expand

# include <iostream>
# include <algorithm>
# include <vector>
# include <string>
# include <set>
# include <functional>
using namespace std;
int main() {
	string s;
	int n;
	cin >> n >> s;
	bool a = true;
	if (n % 2 == 0) {
		a = false;
	}
	else {
		for (int i = 1; i <= n / 2; i++) {
			if (i % 3 == 1) {
				if (s[n / 2 + i] != 'c'||s[n / 2 - i] != 'a') {
					a = false;
				}
			}
			else if (i % 3 == 2) {
				if (s[n / 2 + i] != 'a'||s[n / 2 - i] != 'c') {
					a = false;
				}
			}
			else if (i % 3 == 0) {
				if (s[n / 2 + i] != 'b'||s[n / 2 - i] != 'b') {
					a = false;
				}
			}
		}
	}
	if (a) {
		cout << n / 2 << endl;
	}
	else {
		cout << -1 << endl;
	}
}

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