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题目 Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree [1,2,2,3,4,4,3] is sym 阅读全文
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题目 Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally id 阅读全文
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题目 Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: The number of elements initialized in nums1 and 阅读全文