Problem p01873 - Generation 1

Orig Description

B: Periodic Sequence
Problem
Dr. Period, who serves as a professor at H University, researches the property called the "period" that is said to lurk in everything. As a basic period generally known, a period lurking in a sequence could be considered. That is, if the length N sequence S = S_1, S_2, ... , S_N satisfies the following property, it is a fact that it has a period t (t \≤ N).
For 1 \≤ i \≤ N − t, S_i=S_{i+t}.
Now, Dr. Period is focusing on sequences that can be described more simply using periods. For example, if a length N sequence has a period t (\≤ N), and it can be written as N=kt using an integer k, the sequence can be described as a length t sequence S_1, ... , S_t that is a concatenation of k continuous ones. Dr. Period has decided to call such a sequence a k-part.
Dr. Period is interested in the largest k-part. Therefore, you, as an assistant, have been asked to create a program that takes a sequence as input and outputs the largest k when it is a k-part. Create a program that accurately responds to Dr. Period's request.
Input Format
N
S_1 ... S_N
The first line contains an integer N, which represents the length of the sequence. The second line contains integers S_i (1 \≤ i \≤ N) that represent each element of the length N sequence, separated by spaces. The input satisfies 1 \≤ N \≤ 200,000 and 1 \≤ S_i \≤ 100,000 (1 \≤ i \≤ N).
Output Format
For the given sequence, output the maximum value of k when it is a k-part on one line.
Sample Input 1
6
1 2 3 1 2 3
Sample Output 1
2
Sample Input 2
12
1 2 1 2 1 2 1 2 1 2 1 2
Sample Output 2
6
Sample Input 3
6
1 2 3 4 5 6
Sample Output 3
1

Extracted Specification

An integer N (1 ≤ N ≤ 200,000), representing some quantity or size.
A list of integers S of size N, where each integer is between 1 and 100,000.

### Example Input:

```
6
1 2 3 1 2 3
```

### Function Signature:
Write a function f(N, S) that takes in the input.
def f(N: int, S: List[int]): 
    ''' 
    N: an integer 
    S: a list of integers 
    '''

Test Case Generator

Sure, I can write a test case generator for the "Periodic Sequence" problem. Here is a Python function that generates random test cases for the problem:

```python
import random

def tcgen():
    # Generate the length of the sequence N
    N = random.randint(1, 200000)

    # Generate the sequence S with elements ranging from 1 to 100000
    S = [random.randint(1, 100000) for _ in range(N)]
    
    return N, S

# Example of usage
if __name__ == "__main__":
    N, S = tcgen()
    print(N)
    print(' '.join(map(str, S)))
```

### Explanation

1. **N Generation**: A random integer `N` is generated within the range of 1 to 200,000, which represents the length of the sequence.
2. **S Generation**: A list `S` of length `N` is generated with each element being a random integer between 1 and 100,000, representing the sequence elements.

### Example Output

When you run the `tcgen` function, it will output a random test case. For instance:
```
13245
12345 6789 1011 1213 1415 ... (continues for 13245 numbers)
```

You can use this function to generate multiple test cases for testing the algorithm that solves the "Periodic Sequence" problem. This will help ensure that the algorithm performs well on a wide range of inputs, including edge cases.

Extract Arguments

def extract_arguments(fh):
    N = int(fh.readline().strip())
    S = list(map(int, fh.readline().strip().split()))
    return N, S