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| // @Title: 数据流中的中位数 (数据流中的中位数 LCOF)
// @Author: 15816537946@163.com
// @Date: 2022-02-20 15:05:52
// @Runtime: 80 ms
// @Memory: 13.6 MB
import "container/heap"
type IntHeap []int
func (h IntHeap) Len() int { return len(h)}
func (h IntHeap) Less(i, j int) bool { return h[i] < h[j] }
func (h IntHeap) Swap(i,j int) {h[i],h[j] = h[j],h[i]}
func (h *IntHeap) Push(x interface{}) {
*h = append(*h, x.(int))
}
func (h *IntHeap) Pop() interface{} {
old:= *h
n := len(old)
x := old[n-1]
*h = old[:n-1]
return x
}
type MedianFinder struct {
large, small *IntHeap
}
/** initialize your data structure here. */
func Constructor() MedianFinder {
a := &IntHeap{}
b := &IntHeap{}
heap.Init(a)
heap.Init(b)
return MedianFinder{a,b}
}
func (this *MedianFinder) AddNum(num int) {
if this.large.Len() == 0 || num > (*this.large)[0] {
heap.Push(this.large,num)
} else {
heap.Push(this.small,-num)
}
// 调节大小栈,确保 `FindMedian()` 得到正确的结果
if this.large.Len() > this.small.Len() +1 {
heap.Push(this.small,-heap.Pop(this.large).(int))
} else if this.small.Len() > this.large.Len() +1 {
heap.Push(this.large,-heap.Pop(this.small).(int))
}
}
func (this *MedianFinder) FindMedian() float64 {
if this.large.Len() < this.small.Len() {
return float64(-(*this.small)[0])
} else if this.large.Len() > this.small.Len() {
return float64((*this.large)[0])
}
return float64(-(*this.small)[0]+(*this.large)[0])/2
}
/**
* Your MedianFinder object will be instantiated and called as such:
* obj := Constructor();
* obj.AddNum(num);
* param_2 := obj.FindMedian();
*/
|