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- #include <iostream>
- using namespace std;
- int main() {
- string input_s;
- int input_n;
- cin >> input_n;
- cin >> input_s;
- int size = input_n * 2;
- char* arr = new char[size];
- char query = input_s[input_n - 1];
- int index;
- int cnt = 0;
- for (int a = 0; a < input_n; a++) {
- arr[a] = input_s[a];
- arr[a + input_n] = input_s[a];
- if (input_s[a] == query) {
- index = a;
- }
- }
- for (int a = index; a < index + input_n; a++) {
- if (arr[a] == input_s[input_n + index - a - 1]) {
- cnt++;
- }
- }
- cout << ((cnt == input_n) ? cnt - 1 : -1);
- return 0;
- }
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