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Cod sursa(job #190555)
#include<stdio.h>
#define Nmax 1000010
#define IN "prefix.in"
#define OUT "prefix.out"
int maxp,t;
char c[Nmax];
int pi[Nmax];
void prefix()
{
int k=0;
for(int i=2;c[i]!='\0';++i)
{
while ( (k>0) && (c[k+1]!=c[i]) )
k=pi[k];
if(c[i]==c[k+1])
k++;
pi[i]=k;
if(pi[i]!=0)
if(pi[i]%(i-pi[i])==0)
maxp=i;
}
}
int main()
{
freopen(IN,"r",stdin);
freopen(OUT,"w",stdout);
scanf("%d\n",&t);
for(int ti=1;ti<=t;++ti)
{
gets(c+1);
prefix();
printf("%d\n",maxp);
}
return 0;
}