堆資料結構

標籤：

以下是小根堆定義，包括向堆中插入元素，刪除堆中元素，建立新堆，調整堆等函數。

typedef int Elemtype;class MinHeap{public:    MinHeap() :elem(0), size(0){}    void BuildMinHeap(vector<Elemtype> v);    void Modify(int i);    int Delete();    void Insert(Elemtype e);private:    vector<Elemtype> elem;    int size;};void MinHeap::BuildMinHeap(vector<Elemtype> v){    elem = v;    size = v.size();    int i = size / 2;    while (i > 0){        Modify(i);        i--;    }}void MinHeap::Modify(int i){    Elemtype temp = elem[i];    int parent, child;    for (parent = i; parent * 2 <= size; parent = child){        child = parent * 2;        if (child + 1 <= size&&elem[child + 1] < elem[child])            child++;        if (elem[child] > temp)            break;        else            elem[parent] = elem[child];    }    elem[parent] = temp;}void MinHeap::Insert(Elemtype e){    elem.push_back(e);    int i;    i = ++size;    for (; elem[i / 2] > e; i /= 2){        elem[i] = elem[i / 2];    }    elem[i] = e;}int MinHeap::Delete(){    Elemtype temp = elem[1];    elem[1] = elem[size--];    elem.pop_back();    Modify(1);    return temp;}

 

堆資料結構