immjc

2017年7月23日

摘要： You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you cl 阅读全文

posted @ 2017-07-23 18:34 immjc 阅读(135) 评论(0) 推荐(0) 编辑

[LeetCode] Binary Tree Level Order Traversal II

摘要： Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For 阅读全文

posted @ 2017-07-23 18:13 immjc 阅读(122) 评论(0) 推荐(0) 编辑

[LeetCode] Set Mismatch

摘要： The set S originally contains numbers from 1 to n. But unfortunately, due to the data error, one of the numbers in the set got duplicated to another n 阅读全文

posted @ 2017-07-23 17:06 immjc 阅读(154) 评论(0) 推荐(0) 编辑

2017年7月22日

[LeetCode] Power of Four

摘要： Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example:Given num = 16, return true. Given num = 5, return fa 阅读全文

posted @ 2017-07-22 22:03 immjc 阅读(157) 评论(0) 推荐(0) 编辑

[LeetCode] Power of Three

摘要： Given an integer, write a function to determine if it is a power of three. Follow up:Could you do it without using any loop / recursion? 判断一个数是否是3的幂，则阅读全文

posted @ 2017-07-22 21:53 immjc 阅读(166) 评论(0) 推荐(0) 编辑

[LeetCode] Power of Two

摘要： Given an integer, write a function to determine if it is a power of two. 判断一个整数是否是2的幂。如果一个数是2的幂，则这个数的二进制表示中，最高位是1，其他位都是0。这个数-1的二进制位全是1。所以我们可以利用这个规律对两个阅读全文

posted @ 2017-07-22 21:39 immjc 阅读(144) 评论(0) 推荐(0) 编辑

2017年7月21日

[LeetCode] Happy Number

摘要： Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positive intege 阅读全文

posted @ 2017-07-21 18:16 immjc 阅读(139) 评论(0) 推荐(0) 编辑

[LeetCode] Longest Harmonious Subsequence

摘要： We define a harmonious array is an array where the difference between its maximum value and its minimum value is exactly 1. Now, given an integer arra 阅读全文

posted @ 2017-07-21 17:40 immjc 阅读(168) 评论(0) 推荐(0) 编辑

[LeetCode] Subtree of Another Tree

摘要： Given two non-empty binary trees s and t, check whether tree t has exactly the same structure and node values with a subtree of s. A subtree of s is a 阅读全文

posted @ 2017-07-21 17:19 immjc 阅读(159) 评论(0) 推荐(0) 编辑

2017年7月20日

[Algorithm] Pattern Matching

摘要： 1 蛮力算法 1.1 算法描述蛮力串匹配是最直接最直觉的方法。可假想地将文本串和模式串分别写在两条印有等间隔方格的纸带上，文本串对应的纸带固定，模式串纸带的首字符与文本串纸带的首字符对齐，两个都沿水平方向放置。于是，只需将P（长度m）与T（长度n）中长度为m的n - m + 1个子串逐一对比，即可阅读全文

posted @ 2017-07-20 15:48 immjc 阅读(498) 评论(0) 推荐(0) 编辑

Don't live up to your ambition and sorry for your sufferings.

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