【题目】
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.
【题意】
判断了两个二叉树是否相等
【思路】
递归...
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其他好文 时间：
2014-06-02 11:03:03
阅读次数：
205
【题目】
Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2.
For example,
Given:
s1 = "aabcc",
s2 = "dbbca",
When s3 = "aadbbcbcac", return true.
When s3 = "aadbbbaccc", return false.
【题意】
给定字符串s1,s2,s3, 判断s3是不是s1和s2中的字交叉组合...
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其他好文 时间：
2014-06-02 10:58:24
阅读次数：
211
【题目】
Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).
For example, this binary tree is symmetric:
1
/ 2 2
/ \ / 3 4 4 3
But the following is not:
1
/ 2 2
\ 3 3
No...
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其他好文 时间：
2014-06-02 10:56:14
阅读次数：
237
【题目】
Two elements of a binary search tree (BST) are swapped by mistake.
Recover the tree without changing its structure.
Note:
A solution using O(n) space is pretty straight forward. Could you devise a constant space solution?
confused what "{1,#,2,3}" ...
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其他好文 时间：
2014-06-02 10:38:17
阅读次数：
246
【题目】
Given a binary tree, determine if it is a valid binary search tree (BST).
Assume a BST is defined as follows:
The left subtree of a node contains only nodes with keys less than the node's key.
The right subtree of a node contains only nodes with ke...
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其他好文 时间：
2014-06-02 10:29:55
阅读次数：
257
【题目】
Given n, how many structurally unique BST's (binary search trees) that store values 1...n?
For example,
Given n = 3, there are a total of 5 unique BST's.
1 3 3 2 1
\ / / / \ 3 2 1 ...
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其他好文 时间：
2014-06-01 15:34:24
阅读次数：
231
【题目】
Given n, generate all structurally unique BST's (binary search trees) that store values 1...n.
For example,
Given n = 3, your program should return all 5 unique BST's shown below.
1 3 3 2 1
\ / / / \ ...
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其他好文 时间：
2014-06-01 15:33:45
阅读次数：
297
【题目】
Reverse a linked list from position m to n. Do it in-place and in one-pass.
For example:
Given 1->2->3->4->5->NULL, m = 2 and n = 4,
return 1->4->3->2->5->NULL.
Note:
Given m, n satisfy the following condition:
1 ≤ m ≤ n ≤ length of list.
【题意】
...
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其他好文 时间：
2014-06-01 15:08:34
阅读次数：
237
【题目】
Given a string containing only digits, restore it by returning all possible valid IP address combinations.
For example:
Given "25525511135",
return ["255.255.11.135", "255.255.111.35"]. (Order does not matter)
【题意】
给定一个字符串，恢复并返回所有符合条件的IP串
【思路】...
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其他好文 时间：
2014-06-01 13:01:56
阅读次数：
295
【题目】
Given a binary tree, return the inorder traversal of its nodes' values.
For example:
Given binary tree {1,#,2,3},
1
2
/
3
return [1,3,2].
Note: Recursive solution is trivial, could you do it iteratively?
confused what "{1,#,2...
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其他好文 时间：
2014-06-01 13:01:23
阅读次数：
279
