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Given an integer, write a function to determine if it is a power of two. Example 1: Input: 1 Output: true Explanation: 20 = 1 Example 2: Input: 16 Out 阅读全文
posted @ 2018-11-30 15:19
bernieloveslife
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Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be replaced to get t. All occurrenc 阅读全文
posted @ 2018-11-30 15:19
bernieloveslife
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There are n different online courses numbered from 1 to n. Each course has some duration(course length) t and closed on dth day. A course should be ta 阅读全文
posted @ 2018-11-30 15:19
bernieloveslife
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Given a non empty array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runti 阅读全文
posted @ 2018-11-30 15:19
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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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 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 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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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 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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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, rotate the list to the right by k places, where k is non negative. Example 1: Input: 1 2 3 4 5 NULL, k = 2 Output: 4 5 1 2 3 NULL 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Given an absolute path for a file (Unix style), simplify it. For example, path = "/home/", = "/home" path = "/a/./b/../../c/", = "/c" path = "/a/../.. 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Let's call an array A a mountain if the following properties hold: A.length = 3 There exists some 0 A[i+1] ... A[A.length 1] Given an array that is de 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calcul 阅读全文
posted @ 2018-11-30 15:18
bernieloveslife
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Given n, how many structurally unique BST's (binary search trees) that store values 1 ... n? Example: Input: 3 Output: 5 Explanation: Given n = 3, the 阅读全文
posted @ 2018-11-30 15:17
bernieloveslife
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Given a binary tree, return the inorder traversal of its nodes' values. Example: Input: [1,null,2,3] 1 \ 2 / 3 Output: [1,3,2] Follow up: Recursive so 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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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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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 @ 2018-11-30 15:17
bernieloveslife
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