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## Algorithm::SkewHeap cpan:JEFFOBER last updated on 2018-10-24

Algorithm-SkewHeap-0.0.1/

# NAME

Algorithm::SkewHeap - a mergable min heap

0.0.1

# SYNOPSIS

``````use Algorithm::SkewHeap;

my \$heap = Algorithm::SkewHeap.new;

for (1 .. 1000).pick(1000) -> \$n {
\$heap.put(\$n);
}

until \$heap.is-empty {
my \$n = \$heap.take;
}

\$heap.merge(\$other-heap);
``````

# DESCRIPTION

A skew heap is a type of heap based on a binary tree in which all operations are based on merging subtrees, making it possible to quickly combine multiple heaps, while still retaining speed and efficiency. Ammortized performance is O(log n) or better (see https://en.wikipedia.org/wiki/Skew_heap).

# SORTING

Items in the heap are returned with the lowest first. Comparisons are done with the greater than operator, which may be overloaded as needed for types intended to be used in the heap.

## class Algorithm::SkewHeap

SkewHeap class

### method size

```method size() returns Int
```

Returns the number of items in the heap

### method is-empty

```method is-empty() returns Bool
```

Returns true when the heap is empty

### method top

```method top() returns Any
```

Returns the top item in the heap without removing it.

### method take

```method take() returns Any
```

Removes and returns the top item in the heap.

### method put

```method put(
\$value
) returns Int
```

Adds a new item to the heap. Returns the new size of the heap.

### method merge

```method merge(
Algorithm::SkewHeap \$other
) returns Int
```

Destructively merges with another heap. The other heap should be considered unusable afterward. Returns the new size of the heap.

### method explain

```method explain() returns Nil
```

Prints the structure of the heap for debugging purposes.