sameTree.cpp

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     struct TreeNode *left;
 *     struct TreeNode *right;
 * };
 */
bool isSameTree(struct TreeNode* p, struct TreeNode* q) {
   
    if(p==NULL && q==NULL)
        return true;
    if((p==NULL && q!=NULL) || (p!=NULL&&q==NULL) || p!=NULL && q!=NULL && p->val!=q->val)
        return false;
    bool bleft=isSameTree(p->left,q->left);
    bool bright=isSameTree(p->right,q->right);
    
    return bleft && bright;
}