[Jobdu] 题目1521：二叉树的镜像

不知道怎么回事下面的代码通过了4个测试用例,还有1个测试用例始终是Runtime Error,各位帮我看一下是哪里出了问题

镜像输出两种方法,一种是递归进行调整,另外一种就是直接在先序遍历的基础上进行改造,下面代码中实现的是第二种

 #include <cstdio>
 #include <cstdlib>

 typedef struct BTNode{
     int key;
     struct BTNode *lchild;
     struct BTNode *rchild;
 }BTNode;

 BTNode *createBinaryTree(int a[], int n) {
     BTNode *nodes[n];
     for (int i = ; i < n; ++i) {
         nodes[i] = (BTNode *) malloc(sizeof(BTNode));
         nodes[i]->key = a[i];
         nodes[i]->lchild = NULL;
         nodes[i]->rchild = NULL;
     }

     for (int i = ; i < n; ++i) {
         char str[];
         scanf("%s", str);
         if (str[] == 'd') {
             int left, right;
             scanf("%d %d", &left, &right);
             nodes[i]->lchild = nodes[left - ];
             nodes[i]->rchild = nodes[right - ];
         } else if (str[] == 'l') {
             int left;
             scanf("%d", &left);
             nodes[i]->lchild = nodes[left - ];
         } else if (str[] == 'r') {
             int right;
             scanf("%d", &right);
             nodes[i]->rchild = nodes[right - ];
         }
     }

     return nodes[];
 }

 /*
 void getTreeMirror(BTNode *root) {
     if (!root)
         return;
     if (!root->lchild && !root->rchild)
         return;

     BTNode *temp = root->lchild;
     root->lchild = root->rchild;
     root->rchild = temp;

     getTreeMirror(root->lchild);
     getTreeMirror(root->rchild);
 }*/

 void printTreeMirror(BTNode *root, int count) {
     if (root) {
         count ==  ? printf("%d", root->key) : printf(" %d", root->key);
         printTreeMirror(root->lchild, count + );
         printTreeMirror(root->rchild, count + );
     }
 }

 int main() {
     int n;
     while (scanf("%d", &n) != EOF) {
         int a[n];
         for (int i = ; i < n; i++)
             scanf("%d", &a[i]);

         BTNode *root = createBinaryTree(a, n);
         printTreeMirror(root, );
         printf("\n");
     }

     return ;
 }
 /**************************************************************
     Problem: 1521
     User: tonyhu
     Language: C++
     Result: Runtime Error
 ****************************************************************/