Submission #2527012

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Source Code Expand

#include <iostream>
#include <string>
using namespace std;

int main() {
    string S;
    cin >> S;

    int s = 0;
    int t = S.size() - 1;

    int ans = 0;
    bool ok = true;    
    while (s < t) {
        if (S.at(s) == S.at(t)) {
            s++;
            t--;
        } else if (S.at(s) != 'x' && S.at(t) != 'x') {
            ok = false;
            break;
        } else if (S.at(s) == 'x') {
            s++;
            ans++;
        } else if (S.at(t) == 'x') {
            t--;
            ans++;
        } else {
            puts("error");
            return 1;
        }
    }

    cout << (ok ? ans : -1) << endl;
    return 0;
}

Submission Info

Judge Result