leetcode 100. Same Tree
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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.
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思考:遍历两个树的过程中比较,注意递归的出口和递归的时机。
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
public class Solution {
public boolean isSameTree(TreeNode p, TreeNode q) {
if(p == null && q == null){
return true;
}else if(p != null && q != null){
boolean ret = false;
if(p.val == q.val){
ret = true;
}else{
return false;
}
ret = isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
return ret;
}else{
return false;
}
}
}
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