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The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order,We get the following sequence 阅读全文
posted @ 2016-10-09 06:05
Machelsky
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We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wron 阅读全文
posted @ 2016-10-09 04:35
Machelsky
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Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. Given a singly linked list where element 阅读全文
posted @ 2016-10-09 03:48
Machelsky
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Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in or 阅读全文
posted @ 2016-10-09 03:36
Machelsky
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Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. 阅读全文
posted @ 2016-10-09 03:26
Machelsky
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Given a list, rotate the list to the right by k places, where k is non-negative. For example:Given 1->2->3->4->5->NULL and k = 2,return 4->5->1->2->3- 阅读全文
posted @ 2016-10-09 03:02
Machelsky
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190. Reverse Bits:原数向右移动，如果bit是1，就给结果在相应的位置加上1. 46. Permutations:最适合这道题的dfs搜索顺序是把加一个限制条件：搜索过的数字跳过。脑子里面有个tree的模型然后去想应该搜索的顺序和条件。 100. Same Tree: 递归：检查是不 阅读全文
posted @ 2016-10-09 02:34
Machelsky
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The gray code is a binary numeral system where two successive values differ in only one bit. Given a non-negative integer n representing the total num 阅读全文
posted @ 2016-10-09 02:25
Machelsky
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