100. Same Tree
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判断两个二叉树是否相同
class Solution { 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, p.right) && isSameTree(q.left, q.right); } return false; }}
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