Submission #64100025

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#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
vector<int> prefix_function(string &s) {
    int n = s.size();
    vector<int> pi(n);
    for (int i = 1; i < n; i++) {
        int j = pi[i-1];
        while (j > 0 && s[i] != s[j])
            j = pi[j-1];
        if (s[i] == s[j])
            j++;
        pi[i] = j;
    }
    return pi;
}
int main() {
    string s;
 
 
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#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

vector<int> prefix_function(string &s) {
    int n = s.size();
    vector<int> pi(n);
    for (int i = 1; i < n; i++) {
        int j = pi[i-1];
        while (j > 0 && s[i] != s[j])
            j = pi[j-1];
        if (s[i] == s[j])
            j++;
        pi[i] = j;
    }
    return pi;
}

int main() {
    string s;
    cin >> s;
    string rev_s(s.rbegin(), s.rend());
    string combined = rev_s + "#" + s;
    vector<int> pi = prefix_function(combined);
    int k = pi.back();
    string result = s + rev_s.substr(k);
    cout << result << endl;
    return 0;
}

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