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| // @Title: 数据流的中位数 (Find Median from Data Stream)
// @Author: 15816537946@163.com
// @Date: 2021-08-28 18:04:54
// @Runtime: 364 ms
// @Memory: 19.8 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[0 : 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)
}
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();
*/
|