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Given two binary trees, write a function to check if they are equal or not.
Two binary trees are considered equal if they are structurally identical and the nodes have the same value.
struct TreeNode {
int val;
TreeNode *left;
TreeNode *right;
TreeNode(int x) : val(x), left(NULL), right(NULL) {}
bool isSameTree(TreeNode *p, TreeNode *q)
if(p == NULL && q == NULL)
return true;
if(p == NULL || q == NULL)
return false;
bool left = isSameTree(p->left, q->left);
bool right = isSameTree(p->right, q->right);
return left && right && p->val == q->val;