Same Tree LeetCode Solution

Problem – Same Tree

Given the roots of two binary trees p and q, write a function to check if they are the same or not.

Two binary trees are considered the same if they are structurally identical, and the nodes have the same value.

Example 1:

Input: p = [1,2,3], q = [1,2,3]
Output: true

Example 2:

Input: p = [1,2], q = [1,null,2]
Output: false

Example 3:

Input: p = [1,2,1], q = [1,1,2]
Output: false

Constraints:

  • The number of nodes in both trees is in the range [0, 100].
  • -104 <= Node.val <= 104

Same Tree LeetCode Solution in Python

def isSameTree(self, p, q):
    if p and q:
        return p.val == q.val and self.isSameTree(p.left, q.left) and self.isSameTree(p.right, q.right)
    return p is q

Same Tree LeetCode Solution in Java

public boolean isSameTree(TreeNode p, TreeNode q) {
    if(p == null && q == null) return true;
    if(p == null || q == null) return false;
    if(p.val == q.val)
        return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
    return false;
}

Same Tree LeetCode Solution in C++

bool isSameTree(TreeNode *p, TreeNode *q) {
    if (p == NULL || q == NULL) return (p == q);
    return (p->val == q->val && isSameTree(p->left, q->left) && isSameTree(p->right, q->right));
}
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