# Problem Description
The problem involves two integer arrays, `arr1` and `arr2`. We need to determine the number of valid elements after performing element-wise addition of these two arrays. An element is considered valid if its value is greater than a threshold `t`, which is defined as the length of `arr1`.

# Visual Facts
1. **Arrays**: There are two arrays, `arr1` and `arr2`.
2. **Element-wise Addition**: Each element in `arr1` is added to the corresponding element in `arr2`.
3. **Threshold**: The threshold `t` is the length of `arr1`.
4. **Validity Condition**: An element in the resulting array is valid if it is greater than the threshold `t`.
5. **Counting Valid Elements**: The number of valid elements is counted and represented as `N_valid`.

# Visual Patterns
1. **Threshold Calculation**: The threshold `t` is consistently calculated as the length of `arr1`.
2. **Element-wise Addition**: For each index `i`, the sum of `arr1[i]` and `arr2[i]` is calculated.
3. **Comparison with Threshold**: Each sum is compared with the threshold `t`.
   - If the sum is greater than `t`, it is marked as valid.
   - If the sum is less than or equal to `t`, it is marked as invalid.
4. **Counting Valid Elements**: The number of valid elements (those greater than `t`) is counted and returned.


# Solution
def solution(arr1: list[int], arr2: list[int]) -> int:
    """
    Counts the number of valid elements by comparing two integer arrays according to the specified rules.

    Parameters:
        arr1 (list[int]): The first integer array
        arr2 (list[int]): The second integer array

    Returns:
        int: The count of valid elements
    """
    threshold = len(arr1)
    return [arr1[i]+arr2[i]>threshold for i in range(threshold)].count(True)


# Test Script
def test():
    test_cases = [
        ([2,9,5,9,-6,3],[3,-1,0,1,-3,6], 3),
        ([2,1],[1,-1], 1),
        ([6,7,-3,8,2,-3,4],[4,-1,0,-2,-7,-4,-3], 1),
        ([5, 4, 5, 10, 7, 4, 5, 9, 2, 6], [8, 5, 4, 10, 10, 10, 8, 5, 7, 10], 7),
        ([8, 4, 9, 10, 4, 0, 3], [0, 4, 5, 9, 10, 7, 5], 6),
        ([0, 0, 5, 3, 2, 0, 5, 6, 0], [8, 2, 9, 0, 6, 6, 4, 5, 8], 2),
        ([1, 2, 4, 5, 4, 6, 4], [2, 10, 1, 2, 6, 3, 6], 4),
        ([2],[2], 1),
        ([8, 5, 7, 4, 1, 6, 0, 4, 3, 6],[-100, 6, 5, 10, 4, 3, 2, 9, 10, 3], 5),
        ([4, 6],[6, 1], 2),
    ]

    for arr1, arr2, expected_output in test_cases:
        try:
            output = solution(arr1, arr2)
        except Exception as e:
            error_message = (
                f"An exception occurred while running the test case:\n"
                f"`arr1`: {arr1}\n"
                f"`arr2`: {arr2}\n\n"
                f"Exception: '{str(e)}'"
            )
            assert False, error_message
            
        if output != expected_output:
            error_message = (
                f"The following Test Case failed:\n"
                f"`arr1`: {arr1}\n" 
                f"`arr2`: {arr2}\n\n"
                f"Actual Output: {output}\n"
                f"Expected Output: {expected_output}"
            )
            assert False, error_message

test()