Path in a Heap (25)

#include <iostream>
#include <cstring>
using namespace std;
long long i;
long long *A;
void insert(long long a);
int main()
{
    long long n, m;
    cin >> n >> m;

    A = (long long *)malloc((n + 1)*sizeof(long long));

    for (i = 1; i <= n; i++){
        long long a;
        cin >> a;
        insert(a);
    }
    
    for (i = 0; i < m; i++){
        long long q;
        cin >> q;
        cout << A[q];
        q /= 2;
        while (q>0){
            cout << " " << A[q];
            q /= 2;
        }

        cout << endl;
    }
}
void insert(long long a)
{
    long long m = i;
    A[m] = a;
    while ( m/2 > 0){   //循环条件一开始写成了m>0,对计算机来说 = = 真是不一样啊
        if (A[m] < A[m / 2]){
            A[m] ^= A[m / 2];
            A[m / 2] ^= A[m];
            A[m] ^= A[m / 2];
        }
        m /= 2;
    }
}