fn birthday(s: &[i32], d: i32, m: i32) -> i32 {
    let m = m as usize;
    (0..s.len())
        .filter(|&i| i + m <= s.len())
        .filter(|&i| s[i..i + m].iter().sum::<i32>() == d)
        .count() as i32
}