#[derive(Debug)]
pub struct Heap {
    pub heaps: Vec<Vec<i32>>
}

impl Heap {
    pub fn new() -> Heap {
        Heap {
            heaps: Vec::new()
        }
    }

    pub fn len(&self) -> usize {
        self.heaps.len()
    }

    pub fn get(&mut self, i: usize) -> &mut Vec<i32> {
        &mut self.heaps[i]
    }

    pub fn alloc(&mut self, size: usize) -> usize {
        self.heaps.push(vec![0; size]);
        self.len() - 1
    }
}