Hi!
I found the solution for the task.
After getting the repeated array,i make another subarray.I compare the next and the previous values of the array.And because the values are always increasing so if the next is smaller than the previous => the array repeats.And after comparing,it will count 1 time.Then we take the sum beetween the amount of comparision and 1.For examples,We have [1 2 3 4 5].We compare 2 to 1 ....5 to 4.We have 4 times then +1 to get the length of the array.
That is the solution.I found that but anyway,thanks a lot for your helps!
Regards,
SonNam