1086. Tree Traversals Again (25) PAT甲级

2019-11-14 10:08:32

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#include<stdio.h>#include<queue>#include<string.h>#include<stack>using namespace std;#define MAX_N 37int inorder[MAX_N],PReorder[MAX_N];typedef struct Node{ int data; Node *lchild,*rchild;}node,*Btree;int n;void create(Btree &bt,int preL,int preR,int inL,int inR){ if(preL>preR){ bt=NULL; return; } bt=new node; bt->data=preorder[preL]; int leftnum; int i; for(i=inL;i<=inR;i++){ if(inorder[i]==preorder[preL]){ leftnum=i-inL; break; } } create(bt->lchild,preL+1,preL+leftnum,inL,i-1); create(bt->rchild,preL+leftnum+1,preR,i+1,inR);}void postorder(Btree root){ static int count=0; if(root==NULL) return ; postorder(root->lchild); postorder(root->rchild); printf("%d",root->data); count++; if(count<n) printf(" ");}int main(){ scanf("%d",&n); char opr[5]; int num; int preIndex=0,inIndex=0; stack<int> s; for(int i=0;i<2*n;i++){ scanf("%s",opr); if(!strcmp(opr,"Push")){ scanf("%d",&num); preorder[preIndex++]=num; s.push(num); } else{ inorder[inIndex++]=s.top(); s.pop(); } } Btree root=NULL; create(root,0,n-1,0,n-1); postorder(root);}

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