144-15

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

typedef struct node{
    int data;
    struct node *lchild,*rchild;
}TreeNode,*Tree;

void PreToLat(int *A,int Afront,int Arear,int *B,int Bfront,int Brear)
{
    int half;
    if(Arear>=Afront)
    {
        B[Brear]=A[Afront];
        half=(Arear-Afront)/2;
        PreToLat(A,Afront+1,Afront+half,B,Bfront,Bfront+half-1);
        PreToLat(A,Afront+half+1,Arear,B,Bfront+half,Brear-1);
    }
}

int main()
{
    Tree T;
    int A[7]={1,2,4,5,3,6,7};
    int B[7];
    PreToLat(A,0,6,B,0,6);
    for(int i=0;i<7;i++)
        printf("%d  ",B[i]);
    
    return 0;
}