Cod sursa(job #1165773)

Utilizator chiriacandrei25Chiriac Andrei chiriacandrei25 Data 2 aprilie 2014 21:56:20
Problema Prefix Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.75 kb
#include <cstdio>
#include <cstring>
#define Nmax 1000005

using namespace std;

char a[Nmax];
int N,pi[Nmax];

inline void Pi()
{
    int i,k=0;
    pi[1]=0;
    for(i=2;i<=N;++i)
    {
        while(k && a[k+1]!=a[i])
            k=pi[k];
        if(a[k+1]==a[i])
            ++k;
        pi[i]=k;
    }
}

int main()
{
    int T,i,sol;
    freopen ("prefix.in","r",stdin);
    freopen ("prefix.out","w",stdout);
    scanf("%d", &T);
    while(T--)
    {
        scanf("%s", (a+1));
        N=strlen(a+1);
        Pi();
        sol=0;
        for(i=N;i;--i)
            if(pi[i] && i%(i-pi[i])==0)
            {
                sol=i;
                break;
            }
        printf("%d\n", sol);
    }
    return 0;
}