mirror of
https://gitee.com/NorthCityChen/stl-go.git
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74 lines
1.2 KiB
Go
74 lines
1.2 KiB
Go
/*
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* @Author: NorthCity1984
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* @LastEditTime: 2022-04-26 16:06:24
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* @Description:
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* @Website: https://grimoire.cn
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* Copyright (c) NorthCity1984 All rights reserved.
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*/
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package heap
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type Number interface {
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int | int64 | float32 | float64
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}
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type heap[T Number] struct {
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array []T
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len int
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cmp func(T, T) bool
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}
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func (h *heap[T]) up(x int) {
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for x > 1 && h.cmp(h.array[x], h.array[x/2]) {
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h.array[x], h.array[x/2] = h.array[x/2], h.array[x]
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x /= 2
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}
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}
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func (h *heap[T]) down(x int) {
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for x*2 <= h.len {
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t := x * 2
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if t+1 <= h.len && h.cmp(h.array[t+1], h.array[t]) {
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t++
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}
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if !h.cmp(h.array[t], h.array[x]) {
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break
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}
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h.array[x], h.array[t] = h.array[t], h.array[x]
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x = t
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}
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}
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func (h *heap[T]) Push(v T) {
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h.array = append(h.array, v)
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h.len++
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h.up(h.len)
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}
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func (h *heap[T]) Pop() T {
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if h.len == 0 {
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return 0
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}
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ret := h.array[1]
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h.array[1], h.array[h.len] = h.array[h.len], h.array[1]
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h.array = h.array[:h.len]
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h.len--
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h.down(1)
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return ret
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}
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func (h *heap[T]) Top() T {
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return h.array[1]
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}
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func Init[T Number](array []T, cmp func(T, T) bool) heap[T] {
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h := heap[T]{
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array: append([]T{0}, array...),
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len: len(array),
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cmp: cmp,
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}
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for i := h.len; i >= 1; i-- {
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h.down(i)
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}
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return h
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}
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