Submission #19503956

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
const int inf = 1<<30;
const ll INF = 1LL<<60;
#define all(x) (x).begin(),(x).end()
 
int main(){
 
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    string s; cin >> s;
    int n = s.size();
    int ans = 0;
    if(n%2==0){
        string t = s.substr(n/2);
        reverse(all(t));
        int f = s.find(t);
        if(f==0 || f==1) ans = f;
        else ans = n - 1;
    }else{
        string t = s.substr((n+1)/2);
        reverse(all(t));
        int f = s.find(t);
        if(f==0 || f==1 || f==2) ans = f;
        else ans = n - 1;
    }
    cout << ans << '\n';
}

Submission Info

Judge Result