Cod sursa(job #2710201)

Utilizator hhhhhhhAndrei Boaca hhhhhhh Data 22 februarie 2021 09:42:33
Problema Prefix Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.99 kb
#include <bits/stdc++.h>

using namespace std;
ifstream fin("prefix.in");
ofstream fout("prefix.out");
int t,pi[1000005],n;
string s;
void prefix_function()
{
    pi[0]=0;
    for(int i=1;i<n;i++)
    {
        int j=pi[i-1];
        while(j>0&&s[j]!=s[i])
            j=pi[j-1];
        if(s[j]==s[i])
            pi[i]=j+1;
        else
            pi[i]=j;
    }
}
void solve()
{
    fin>>s;
    n=s.size();
    prefix_function();
   /* for(int i=0;i<n;i++)
        fout<<pi[i]<<" ";
    fout<<'\n';*/
    int maxim=0;
    for(int lg=1;lg<=n;lg++)
    {
        int nr=0;
        for(int j=2*lg-1;j<=n;j+=lg)
        {
            if(pi[j]==j-(lg-1))
                nr++;
            else
                break;
        }
        if(nr>0)
            maxim=max(maxim,(nr+1)*lg);
    }
    fout<<maxim<<'\n';
}
int main()
{
    ios_base::sync_with_stdio(false);
    fin.tie(0);
    fout.tie(0);
    fin>>t;
    while(t--)
        solve();
    return 0;
}