7-5 堆中的路径

https://pintia.cn/problem-sets/15/problems/713

将一系列给定数字插入一个初始为空的小顶堆H[]。随后对任意给定的下标i，打印从H[i]到根结点的路径。

输入格式:

每组测试第1行包含2个正整数N和M(≤)，分别是插入元素的个数、以及需要打印的路径条数。下一行给出区间[-10000, 10000]内的N个要被插入一个初始为空的小顶堆的整数。最后一行给出M个下标。

输出格式:

对输入中给出的每个下标i，在一行中输出从H[i]到根结点的路径上的数据。数字间以1个空格分隔，行末不得有多余空格。

输入样例:

5 3
46 23 26 24 10
5 4 3

输出样例:

24 23 10
46 23 10
26 10

提交代码

#include <stdio.h>
#include <stdlib.h>

//min heap save from 1 to n

void PushHeap(int *heap, int &len, int data)
{
    int i = ++len;
    while(i!=1 && data < heap[i>>1])
    {
        heap[i] = heap[i>>1];
        i>>=1;
    }
    heap[i] = data;
}

int PopHeap(int *heap, int &len)
{
    if(len==0)
        return -1;
    int ans = heap[1];
    int num = heap[len--];
    int father = 1, child = 2;
    while(child <=len)
    {
        if(child<len && heap[child+1] < heap[child])
            ++child;
        if(num <= heap[child])
            break;
        heap[father] = heap[child];
        father = child;
        child <<= 1;
    }
    heap[father] = num;
    return ans;
}

void MakeHeap(int *heap, int len)
{
    for(int i=len/2;i>=1;i--)
    {
        int num = heap[i];
        int father = i, child = i*2;
        while(child<=len)
        {
            if(child<len && heap[child+1]<heap[child])
                child++;
            if(num<=heap[child])
                break;
            father = child;
            child *= 2;
        }
        heap[father] = num;
    }
}

void SortHeap(int *heap, int len)
{
    MakeHeap(heap,len);
    for(int i=len;i>1;i--)
        heap[i] = PopHeap(heap,len);
}

int main()
{
    int insertNum,printNum,tmp;
    //int *heap = (int *)malloc(sizeof(int)*(insertNum+1));
    int heap[1024] = {0};
    int len = 0;
    scanf("%d %d",&insertNum,&printNum);
    for(int i=0;i<insertNum;i++)
    {
        scanf("%d",&tmp);
        PushHeap(heap,len,tmp);
    }
    for(int i=0;i<printNum;i++)
    {
        scanf("%d",&tmp);
        tmp = tmp < len ? tmp : len;
        bool isFirst = true;
        while(tmp>=1)
        {
            if(isFirst)
            {
                isFirst = false;
                printf("%d",heap[tmp]);
            }
            else
            {
                printf(" %d",heap[tmp]);
            }
            tmp>>=1;
        }
        printf("\n");
    }
    //free(heap);
    return 0;
}