Today I have done leetcode's January LeetCoding Challenge with cpp.

January LeetCoding Challenge 10

Description

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

Solution

class Solution {
public:
  bool isSameTree(TreeNode* p, TreeNode* q) {
    if(p == q) return true;
    if(!p || !q) return false;
    if(p->val != q->val) return false;
    return isSameTree(p->left, q->left) && isSameTree(p->right, q->right);
  }
};

// Accepted
// 60/60 cases passed (0 ms)
// Your runtime beats 100 % of cpp submissions
// Your memory usage beats 48.63 % of cpp submissions (10 MB)