100. Same Tree

100. Same Tree

判断两树是不是相同

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