#include <>
#include <>
//ABH##I###
struct Node{
char data;
struct Node *lchild,*rchild;
};
struct Node* createBitree(){
char ch;
struct Node *t;
scanf("%c",&ch);
if(ch=='#') {
t = NULL;
}else{
if(!(t = (struct Node*)malloc(sizeof(struct Node))))
exit(-1);
t->data = ch;
t->lchild=createBitree();
t->rchild=createBitree();
}
return t;
}//前序遍历建树
//返回0代表非完全,1代表是完全二叉树
int complete_or_not(struct Node* T){
if(!T) return 0;
struct Node a[100];
int rear=0,front=-1;
a[rear] = *T;
if(T->lchild==NULL&&T->rchild==NULL)return 1;//如果只有一跟根节点则返回1
if(T->lchild==NULL||T->rchild==NULL)return 0;//如果根节点有一个子树为空则返回0
while(front!=rear){
front++;
//该节点的左右孩子都不为空则都入队
if(a[front].lchild!=NULL&&a[front].rchild!=NULL){
rear++;
a[rear] = *a[front].lchild;
rear++;
a[rear] = *a[front].rchild;
}else if(a[front].lchild==NULL&&a[front].rchild!=NULL){ //该节点的左孩子为空右孩子不为空则非完全二叉树
return 0;
}else if((a[front].lchild!=NULL&&a[front].rchild==NULL)||(a[front].lchild==NULL&&a[front].rchild==NULL)){ //该节点的左孩子不为空右孩子为空,或左右都为空的话,后面访问的节点必需都是叶子节点
for(int i=front+1;i<=rear;i++){
if(a[i].lchild!=NULL||a[i].rchild!=NULL){
return 0;
}
}//对这颗树的剩余节点进行遍历
}
}
return 1;
}
int main(){
struct Node* node;
node = createBitree();
if(complete_or_not(node)){
printf("Exactly,a complete binary tree!!!\n");
}else{
printf("this is not a complete binary tree.");
}
}