常用排序算法——堆排序

#include <iostream>
#include <vector>

class heap {
public:
    heap(int* array, size_t len):arr (array), length(len){
        size_t point = (length -1)/2;
        for(size_t i = 0; i != point; ++i){
            adjust(point-i, length);
        }
    }
    void sort(){
        int tmp;
        for(size_t i = 0; i != length; ++i){
            tmp = arr[0];
            arr[0] = arr [length-1-i];
            arr[length -1-i] = tmp;

            adjust(0, length-1-i);
        }
    }
    ~heap(){}
private:
    void adjust( size_t pos, size_t len){
        size_t next;
        for(int tmp = arr[pos]; 2*pos+1 < len; pos = next){
            next = 2*pos+1;
            if(next < len-1 && arr [next] < arr[next+1]){
                ++next;
            }

            if(tmp < arr [next]){
                arr[pos] = arr [next];
                arr[next] = tmp;
            }
        }
    }
private:
    int* arr ;
    size_t length ;
};

int main(){
    int array[10] = {9, 5, 7, 4, 8, 1, 3, 4, 6, 5};
    heap h(array, 10);

    h.sort();

    for(size_t i = 0; i != 10; ++i){
        std::cout << array[i] << " ";
    }
    std::cout << std:: endl;
    return 0;
}

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本文作者：girlkoo