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RSS订阅原创 Binary Tree Postorder Traversal
Given a binary tree, return the postorder traversal of its nodes' values. For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [3,2,1].
2014-07-04 01:54:20
293
原创 Binary Tree Preorder Traversal
Given a binary tree, return the preorder traversal of its nodes' values. For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,2,3].
2014-07-03 10:56:26
288
原创 LRU Cache
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if
2014-07-03 10:52:29
360
原创 Sort List
Sort a linked list in O(n log n) time using constant space complexity. The tricky point of this problem is that these number stored in an li
2014-05-31 12:23:19
406
原创 Evaluate Reverse Polish Notation
Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another expression. Some examples: ["2", "1", "+
2014-05-29 12:49:36
416
原创 Reverse Words in a String
Given an input string, reverse the string word by word. For example, Given s = "the sky is blue", return "blue is sky the".
2014-05-29 12:03:34
557
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