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Reverse a singly linked list. Example: Input: 1 2 3 4 5 NULL Output: 5 4 3 2 1 NULL Follow up: A linked list can be reversed either iteratively or rec 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? No extra space solution： 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Convert a non negative integer to its english words representation. Given input is guaranteed to be less than 231 1. Example 1: Input: 123 Output: "On 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example: 1 A 2 B 3 C ... 26 Z 27 AA 28 AB ... Example 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Given an input string, reverse the string word by word. Example: Input: "the sky is blue", Output: "blue is sky the". Note: A word is defined as a seq 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Given an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product. Example 1: I 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally ident 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2]). F 阅读全文
posted @ 2018-11-30 15:17
bernieloveslife
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SQL Schema There is a table World + + + + + + | name | continent | area | population | gdp | + + + + + + | Afghanistan | Asia | 652230 | 25500100 | 20 阅读全文
posted @ 2018-11-30 15:17
bernieloveslife
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Example 1: Given the following tree [3,9,20,null,null,15,7]: Return true. Example 2: Given the following tree [1,2,2,3,3,null,null,4,4]: Return false. 阅读全文
posted @ 2018-11-30 15:17
bernieloveslife
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