Последовательность?

#include <stdio.h>

#define SIZE 15
//proverka massiva na periodichnost

int main()
{
    int start,finish,len,flag,i, j,arr[SIZE]={5,3,2,5,3,2,5,3,2,5,3,2,5,3,2};
    start = 0;
    flag = 1;

   for(i=1;i<SIZE;i++)//poisk podmassiva
   {
       if(arr[start]==arr[i])//element sovpadaet s pervym?
       finish = i, i= SIZE;

   }
   printf("start-%d\t, finish-%d\n",start,finish);
   len = finish-start;

   for(i=0;i<SIZE-len;i++)
   {
       if(arr[i]!=arr[i+len])
        flag = 0;
   }
   printf("flag - %d",flag);



    return 0;
}