Cod sursa(job #1405097)

Utilizator mircea.dobreanuMircea Dobreanu mircea.dobreanu Data 28 martie 2015 20:43:57
Problema Prefix Scor 90
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.74 kb
#include <fstream>
#include <string>
#include <vector>
using namespace std;

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

vector<int> prefixFunction(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()
{
	int t = 0;	fin >> t;
	while (t--)
	{
		string s;
		fin >> s;

		vector<int> pi = prefixFunction(s);

        int res = 0;
        for (int i = pi.size(); i > 0; --i)
		{
			if (pi[i - 1] && i % (i - pi[i - 1]) == 0)
			{
				res = i;
                break;
			}
		}
		fout << res << '\n';
	}
	return 0;
}