leetcode[100]:Same Tree

Same Tree

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.

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     struct TreeNode *left;
 *     struct TreeNode *right;
 * };
 */
bool isSameTree(struct TreeNode* p, struct TreeNode* q) {

    bool k=true;
    if(!p) 
    {
        if(!q) return true;
        return false;
    }
    if( !q) return false;
    if (p->val != q->val) return false;
    k = isSameTree(p->left,q->left);
    if(!k) return false;
    k=isSameTree(p->right,q->right);
    if(!k) return false;

    return true;
}

递归查询子树是否相同即可，不同的条件剔除。