Type alias SegTreeInner<T>

SegTreeInner<T>: {
    actualLen: number;
    items: T[];
    monoid: Monoid<T>;
    srcLen: number;
}

actualLen: number
The number of the actual stored items, or capacity. Primary data are stored from items[size - 1] to items[size - 1 + srcLen].
items: T[]
Tree of items calculated by monoid.combine. It defaults to monoid.identity.

At the element of index, the relationships are:
- Parent: Math.floor((index - 1) / 2),
- First child: index * 2 + 1,
- Second child: index * 2 + 2.
monoid: Monoid<T>
The Monoid instance for T.
srcLen: number
The length of source array.