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Cod sursa(job #779727)
#include <stdio.h>
#include <string.h>
#define NMax 1000010
const char IN[]="prefix.in",OUT[]="prefix.out";
int Tes,N,Rez;
int P[NMax];
char A[NMax];
void prefix(){
int i,k=0;
P[1]=0;Rez=0;
for (i=2;i<=N;++i)
{
while (k>0 && A[k+1]!=A[i])
k=P[k];
if (A[k+1]==A[i])
++k;
P[i]=k;
if (P[i]>=i/2 && i%(i-P[i])==0 ) Rez=i;
}
}
int main()
{
freopen(IN,"r",stdin);
scanf("%d",&Tes);
freopen(OUT,"w",stdout);
while (Tes--)
{
scanf("%s",A+1);
N=strlen(A+1);
prefix();
printf("%d\n",Rez);
}
fclose(stdout);
fclose(stdin);
return 0;
}