北叶青藤

2016年7月12日

摘要： Factory is a design pattern in common usage. Implement a ShapeFactory that can generate correct shape. You can assume that we have only tree different 阅读全文

posted @ 2016-07-12 06:37 北叶青藤阅读(502) 评论(0) 推荐(0) 编辑

Decode Ways

摘要： A message containing letters from A-Z is being encoded to numbers using the following mapping: 'A' -> 1 'B' -> 2 ... 'Z' -> 26 Given an encoded messag 阅读全文

posted @ 2016-07-12 02:45 北叶青藤阅读(223) 评论(0) 推荐(0) 编辑

279. Perfect Squares

摘要： Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. Example Given n = 12, retu 阅读全文

posted @ 2016-07-12 02:04 北叶青藤阅读(242) 评论(0) 推荐(0) 编辑

House Robber I & II & III

摘要： House Robber You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constrain 阅读全文

posted @ 2016-07-12 00:26 北叶青藤阅读(229) 评论(0) 推荐(0) 编辑

2016年7月11日

Move Zeroes.

摘要： Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements. Notice You must 阅读全文

posted @ 2016-07-11 21:39 北叶青藤阅读(167) 评论(0) 推荐(0) 编辑

2016年7月10日

67. Add Binary

摘要： Given two binary strings, return their sum (also a binary string). Example a = 11 b = 1 Return 100 分析：这个和10进制加法一样。 total = a + b + carryover; digit = 阅读全文

posted @ 2016-07-10 23:51 北叶青藤阅读(163) 评论(0) 推荐(0) 编辑

Plus One & Plus One Linked List

摘要： Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored such that the most significant digit is a 阅读全文

posted @ 2016-07-10 23:04 北叶青藤阅读(233) 评论(0) 推荐(0) 编辑

The Smallest Difference

摘要： Given two array of integers(the first array is array A, the second array is arrayB), now we are going to find a element in array A which is A[i], and 阅读全文

posted @ 2016-07-10 12:45 北叶青藤阅读(323) 评论(0) 推荐(0) 编辑

Space Replacement

摘要： Write a method to replace all spaces in a string with %20. The string is given in a characters array, you can assume it has enough space for replaceme 阅读全文

posted @ 2016-07-10 12:39 北叶青藤阅读(211) 评论(0) 推荐(0) 编辑

Invert Binary Tree

摘要： Invert a binary tree. Invert a binary tree. Invert a binary tree. Example 1 1 / \ / \ 2 3 => 3 2 / \ 4 4 1 /** 2 * Definition of TreeNode: 3 * public 阅读全文

posted @ 2016-07-10 12:32 北叶青藤阅读(118) 评论(0) 推荐(0) 编辑

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