fn main() {
    // Dane wejściowe
    let v : Vec<f32> = (0..25).map(|x| x as f32).collect();

    let mean : f32 = v.iter().sum::<f32>() / v.len() as f32;

    // suma kwadratów
    let sum_of_squares : f32 = v.iter()
        .fold(0.0, |a, x| a + (x - mean).powi(2));

    println!("Sum of squares: {}", sum_of_squares);
}