Golang-堆
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type IntMinHeap []int
func (h IntMinHeap) Len() int { return len(h) }
func (h IntMinHeap) Less(i, j int) bool { return h[i] < h[j] } // 小顶堆
func (h IntMinHeap) Swap(i, j int) { h[i], h[j] = h[j], h[i] }
func (h *IntMinHeap) Push(x any) {
*h = append(*h, x.(int))
}
func (h *IntMinHeap) Pop() any {
old := *h
n := len(old)
x := old[n-1]
*h = old[:n-1]
return x
}

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