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Cod sursa(job #733585)
#include<iostream>
#include<fstream>
#include<string.h>
using namespace std;
char c[1000001];
int v[1000001],n;
void prefix()
{
int i,q;
q=0;
v[0]=0;
for(i=1;i<=n;i++) {
while((q)&&(c[i]!=c[q]))
q=v[q];
if(c[i]==c[q])
q++;
v[i]=q;
}
}
int main ()
{
int t,i,j,max;
ifstream f("prefix.in");
ofstream g("prefix.out");
f>>t;
for(i=1;i<=t;i++) {
f>>c;
n=strlen(c)-1;
prefix();
max=0;
for(j=0;j<=n;j++)
if((v[j])&&((j+1)%(j+1-v[j])==0)&&(j>max))
max=j;
g<<max+1<<'\n';
}
f.close();
return 0;
}