Cod sursa(job #2759005)

Utilizator alex.prohnitchiAlex Prohnitchi alex.prohnitchi Data 14 iunie 2021 20:14:00
Problema Prefix Scor 0
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 1.36 kb
// by Alex Prohnitchi
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;

const ll mod=1e9+7;
const ll INF=2e9;

const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};

#define all(x) x.begin(),x.end()
#define allr(x) x.rbegin(),x.rend()
#define rc(x)  return cout<<x<<"\n",0
#define sz(s)  (int) s.size()
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define PI 3.14159265358979

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l,int r){return uniform_int_distribution<int>(l,r)(rng);}

ifstream fin("prefix.in");
ofstream fout("prefix.out");

ll t,n;

void solve() {
	string s;
	fin >> s;
	ll n=sz(s);
	ll j=0,pref[n+2];
	pref[1]=0;
	ll mx=-1,ind;
	for (int i=2; i<=n; i++) {
		while (j>0 && s[j]!=s[i-1]) {
			j=pref[j];
		}
		if (s[j]==s[i-1])j++;
		pref[i]=j;
		//cout <<"a";
		if (j>mx) {
			mx=j;
			ind=i;
		}
	}
	ll md,ans;
	for (int i=1; i<=ind; i++) {
		if (pref[i]==0)md=i;	
	}
	ans=ind-(ind%md);
	if (s[0]!=s[1] && ans==2) {
		fout << "0\n";
	}
	else fout << ans << '\n';
	return;
}

int main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	t=1;
	fin >> t;
	while (t--) {
		solve();
	}

}