Submission #1801126

---

Source Code Expand

#include<cstdio>
#include<queue>
using namespace std;
int main() {
    deque<char> q;
    char c;
    int ans=0;
    while(scanf("%c",&c)>0) {
        if(c<'a' || c>'z') break;
        q.push_back(c);
    }
    while(q.size()>1) {
        if(q.front()==q.back()) {
            q.pop_back();
            q.pop_front();
        }
        else if(q.front()=='x') {
            q.pop_front();
            ans++;
        } else if(q.back()=='x') {
            q.pop_back();
            ans++;
        } else return 0*printf("-1\n");
    }
    printf("%d\n",ans);
    return 0;
}

Submission Info

Judge Result