c++ - Running on my laptop, but giving runtime error on Leetcode -


i have build tree preorder , inorder traversals. code working fine on laptop, not on leetcode. giving runtime error, suggestions ? 

int findindex(vector<int>& inorder,int index) {     int size = inorder.size();     for(int i=0;i<size;i++)     {         if(index == inorder[i])                 return index;     } }  treenode* helper(vector<int>& preorder, vector<int>& inorder, int start, int end) {     static int preindex = 0;     if(start > end)         return null;     treenode* head;     head = (treenode *)malloc(sizeof(treenode));     head->val = preorder[preindex++];     head->left = null;     head->right = null;     if(start == end)         return head;     int index = findindex(inorder,head->val);      head->left = helper(preorder, inorder,start, index-1);     head ->right = helper(preorder, inorder, index+1, end);     return head; }  treenode* solution::buildtree(vector<int> &preorder, vector<int> &inorder) {     int size = preorder.size();     if(size == 0)         return null;     return helper(preorder, inorder, 0, size-1); }


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