HDU 1710 二叉树的遍历

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#include <iostream>#include <stack>using namespace std;typedef struct Node{     Node *l,*r;    //struct Node 与 Node  均可以  int num;}*tree;tree root;tree creat(int a[],int b[],int n){tree ss;for (int i=0;i<n;i++){if (a[0] == b[i]){            ss = (tree)malloc(sizeof(Node));ss->num = b[i];ss->l=creat(a+1,b,i);ss->r=creat(a+i+1,b+i+1,n-i-1);return ss;}}return NULL;}void post_order(tree h){     if (h !=NULL)     //if判断一定不能少,因为到叶子的地方就停止了,     {post_order(h->l);post_order(h->r);if (root == h){cout<<h->num<<endl;}else    cout<<h->num<<" "; }}int main(){    int a[1000],b[1000],n,i;tree h;while (cin>>n){for(i=0;i<n;i++){cin>>a[i];}for (i=0;i<n;i++){cin>>b[i];}root = h = creat(a,b,n);post_order(h);}return 0;}


从先序遍历与中序遍历中得到根节点,再根据中序遍历中根的左边(左子树)与右边(右子树),再递归找根。

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