def arrayManipulation(n, queries):
    """Finds the maximum value in an array after multiple range updates.

    Uses a difference array to efficiently track changes.

    Args:
        n (int): Array size.
        queries (list of list): List of [start, end, value] updates.

    Returns:
        int: Maximum value after all updates.
    """

    diff = [0] * (n + 2)  # Difference array (1-indexed with extra cell)

    for start, end, value in queries:
        diff[start] += value  # Increase at start
        diff[end + 1] -= value  # Cancel effect after end

    max_num = 0  # Track maximum value
    curr_sum = 0  # Track current prefix sum
    for i in range(1, n + 1):
        if diff[i] == 0:  # Skip if no change
            continue
        curr_sum += diff[i]  # Update prefix sum
        max_num = max(max_num, curr_sum)  # Update maximum

    return max_num