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Convert a non-negative integer to its english words representation. Given input is guaranteed to be less than 231 - 1. For example, 123 -> "One Hundre 阅读全文
posted @ 2016-07-28 05:27
北叶青藤
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Design a Tic-tac-toe game that is played between two players on a n x n grid. You may assume the following rules: A move is guaranteed to be valid and 阅读全文
posted @ 2016-07-27 21:01
北叶青藤
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Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Return 0 if the array contains less than 2 el 阅读全文
posted @ 2016-07-27 11:13
北叶青藤
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You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you nee 阅读全文
posted @ 2016-07-27 05:49
北叶青藤
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Given a non-empty array of integers, return the k most frequent elements. For example,Given [1,1,1,2,2,3] and k = 2, return [1,2]. 分析： http://blog.csd 阅读全文
posted @ 2016-07-27 01:24
北叶青藤
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Given an Android 3x3 key lock screen and two integers m and n, where 1 ≤ m ≤ n ≤ 9, count the total number of unlock patterns of the Android lock scre 阅读全文
posted @ 2016-07-26 23:43
北叶青藤
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Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example:Given n = 2, return 91. (The answer should be the 阅读全文
posted @ 2016-07-26 12:38
北叶青藤
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Given a positive integer num, write a function which returns True if num is a perfect square else False. Note: Do not use any built-in library functio 阅读全文
posted @ 2016-07-26 10:37
北叶青藤
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Given a binary tree, collect a tree's nodes as if you were doing this: Collect and remove all leaves, repeat until the tree is empty. Example:Given bi 阅读全文
posted @ 2016-07-26 01:03
北叶青藤
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Given a non-negative number represented as a singly linked list of digits, plus one to the number. The digits are stored such that the most significan 阅读全文
posted @ 2016-07-26 00:25
北叶青藤
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