POJ—1961 Period

POJ—1961 Period

#include<cstdio>
#include<cstring>
#include<iostream>
using namespace std;
int next[1000005];
int n;
void Next(char T[])
{
 int i=0,j=-1;
 next[0]=-1;
 while(i<n)
 {
  if(j==-1||T[j]==T[i])next[++i]=++j;
  else j=next[j];
 }
}
int main()
{
 char T[1000005];
 int kase=0;
 while(~scanf("%d",&n)&&n!=0)
 {
  scanf("%s",&T);
  Next(T);
  printf("Test case #%d\n",++kase);
  for(int i=2;i<=n;i++)
  {
   if(next[i]>0&&i%(i-next[i])==0)printf("%d %d\n",i,i/(i-next[i]));
  }
  printf("\n");
 }
 return 0;
}