Submission #3411638

---

Source Code Expand

#if !defined(__clang__) && defined(__GNUC__)
#include <bits/stdc++.h>
#else
#include <cstdlib>
#include <climits>
#include <iostream>
#include <cstdint>
#include <vector>
#include <string>
#include <complex>
#include <bitset>
#include <queue>
#include <deque>
#include <stack>
#include <utility>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <regex>
#endif //  !defined(__clang__) && defined(__GNUG__)
#include <boost/lexical_cast.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/multi_array.hpp>
#include <boost/optional.hpp>
#include <boost/math/common_factor_rt.hpp>

constexpr int64_t DIV1097 = 1000000007LL;

using namespace std;

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

    int64_t L = S.size();

    int64_t c = 0;

    int64_t i = 0;
    int64_t j = L-1;
    while (i < j) {
        if (S[i] != S[j]) {
            if (S[i] == 'x') {
                ++i;
                ++c;
            }
            else if (S[j] == 'x') {
                --j;
                ++c;
            }
            else {
                std::cout << -1 << std::endl;
                return 0;
            }
        }
        else {
            ++i;
            --j;
        }
    }

    std::cout << c << std::endl;

    return 0;
}

Submission Info

Judge Result