coder_orz-CSDN博客

原创 382. Linked List Random Node [medium] (Python)

题目链接https://leetcode.com/problems/linked-list-random-node/题目原文 Given a singly linked list, return a random node’s value from the linked list. Each node must have the same probability of being chosen.

2016-09-01 12:20:33 2040 1

原创 167. Two Sum II - Input array is sorted [medium] (Python)

题目链接https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/题目原文 Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific targ

2016-08-31 19:33:40 5404

原创 387. First Unique Character in a String [easy] (Python)

题目链接https://leetcode.com/problems/first-unique-character-in-a-string/题目原文 Given a string, find the first non-repeating character in it and return it’s index. If it doesn’t exist, return -1. Exam

2016-08-31 19:15:49 4079

原创 383. Ransom Note [easy] (Python)

题目链接https://leetcode.com/problems/ransom-note/题目原文> Given  an  arbitrary  ransom  note  string  and  another  string  containing  letters from  all  the  magazines,  write  a  function  that  will  ret

2016-08-31 19:09:41 3266

原创 389. Find the Difference [easy] (Python)

题目链接https://leetcode.com/problems/find-the-difference/题目原文 Given two strings s and t which consist of only lowercase letters. String t is generated by random shuffling string s and then add one mo

2016-08-31 18:35:58 3775

原创 347. Top K Frequent Elements [medium] (Python)

题目链接https://leetcode.com/problems/top-k-frequent-elements/题目原文 Given a non-empty array of integers, return the k most frequent elements. For example, Given [1,1,1,2,2,3] and k = 2, return [1,

2016-07-30 21:04:11 5831 1

原创 122. Best Time to Buy and Sell Stock II [medium] (Python)

题目链接https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/题目原文 Say you have an array for which the ithi^{th} element is the price of a given stock on day ii. Design an algorithm to fi

2016-07-30 12:31:23 2239

原创 238. Product of Array Except Self [medium] (Python)

题目链接https://leetcode.com/problems/product-of-array-except-self/题目原文 Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to the product of all the eleme

2016-07-30 11:46:33 2548

原创 260. Single Number III [medium] (Python)

题目链接https://leetcode.com/problems/single-number-iii/题目原文 Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two e

2016-07-30 10:58:25 1702

原创 136. Single Number [medium] (Python)

题目链接https://leetcode.com/problems/single-number/题目原文 Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear ru

2016-07-29 14:30:31 3967

原创 338. Counting Bits [medium] (Python)

题目链接https://leetcode.com/problems/counting-bits/题目原文 Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1’s in their binary representation a

2016-07-29 13:27:16 2715

原创 8. String to Integer (atoi) [easy] (Python)

题目链接https://leetcode.com/problems/string-to-integer-atoi/题目原文 Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please

2016-07-28 11:47:13 6713

原创 189. Rotate Array [easy] (Python)

题目链接https://leetcode.com/problems/rotate-array/题目原文 Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4

2016-07-28 10:32:27 5595

原创 278. First Bad Version [easy] (Python)

题目链接https://leetcode.com/problems/first-bad-version/题目原文 You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the q

2016-07-27 18:19:57 3564

原创 155. Min Stack [easy] (Python)

题目链接https://leetcode.com/problems/min-stack/题目原文 Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) – Push element x onto stack. pop()

2016-07-27 17:13:13 3733

原创 7. Reverse Integer [easy] (Python)

题目链接https://leetcode.com/problems/reverse-integer/题目原文 Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321题目翻译反转整数中的数字。例子1：给定x=123，返回321；例子2：给定x=-123，

2016-07-26 21:50:37 10409 2

原创 6. ZigZag Conversion [easy] (Python)

题目链接https://leetcode.com/problems/zigzag-conversion/题目原文 The string “PAYPALISHIRING” is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fix

2016-07-26 21:13:40 3623

原创 1. Two Sum [easy] (Python)

题目链接https://leetcode.com/problems/two-sum/题目原文 Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have e

2016-07-26 20:19:37 13977 1

原创 374. Guess Number Higher or Lower [easy] (Python)

题目链接https://leetcode.com/problems/guess-number-higher-or-lower/题目原文 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.

2016-07-26 19:49:27 3036

原创 371. Sum of Two Integers [easy] (Python)

题目链接https://leetcode.com/problems/sum-of-two-integers/题目原文 Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example: Given a = 1 and b = 2, retu

2016-07-26 12:08:46 6850 2

原创 303. Range Sum Query - Immutable [easy] (Python)

题目链接https://leetcode.com/problems/range-sum-query-immutable/题目原文 Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Given nums = [-

2016-06-20 15:20:23 3050

原创 28. Implement strStr() [easy] (Python)

题目链接https://leetcode.com/problems/implement-strstr/题目原文 Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.题目翻译实现 strSt

2016-06-19 01:25:02 7693 5

原创 67. Add Binary [easy] (Python)

题目链接https://leetcode.com/problems/add-binary/题目原文题目翻译思路方法思路一代码说明思路二代码说明思路三代码说明PS: 新手刷LeetCode，新手写博客，写错了或者写的不清楚还请帮忙指出，谢谢！转载请注明：

2016-06-18 17:29:55 7467 2

原创 14. Longest Common Prefix [easy] (Python)

题目链接https://leetcode.com/problems/longest-common-prefix/题目原文 Write a function to find the longest common prefix string amongst an array of strings.题目翻译写个函数，找出一个字符串数组中所有字符串的最长公共前缀。题目描述不清晰。。。补充几个例子，

2016-06-18 17:06:51 10306 2

原创 203. Remove Linked List Elements [easy] (Python)

题目链接https://leetcode.com/problems/remove-linked-list-elements/题目原文 Remove all elements from a linked list of integers that have value val. Example Given: 1 –> 2 –> 6 –> 3 –> 4 –> 5 –> 6, val

2016-06-18 16:30:01 6931 1

原创 257. Binary Tree Paths [easy] (Python)

题目链接https://leetcode.com/problems/binary-tree-paths/题目原文 Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \2 3 \ 5 All root-t

2016-06-18 15:55:42 6548

原创 190. Reverse Bits [easy] (Python)

题目链接https://leetcode.com/problems/reverse-bits/题目原文 Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 00000010100101000001111010011100

2016-06-18 11:04:11 5959

原创 38. Count and Say [easy] (Python)

题目链接https://leetcode.com/problems/count-and-say/题目原文 The count-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, ... 1 is read off as "one 1"

2016-06-17 19:55:49 7203 1

原创 58. Length of Last Word [easy] (Python)

题目链接https://leetcode.com/problems/length-of-last-word/题目原文 Given a string s consists of upper/lower-case alphabets and empty space characters ’ ‘, return the length of last word in the string. I

2016-06-17 19:41:16 5167

原创 20. Valid Parentheses [easy] (Python)

题目链接https://leetcode.com/problems/valid-parentheses/题目原文 Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string is valid. The brackets must

2016-06-17 10:18:55 8166 1

原创 290. Word Pattern [easy] (Python)

题目链接https://leetcode.com/problems/word-pattern/题目原文 Given a pattern and a string str, find if str follows the same pattern. Here follow means a full match, such that there is a bijection between

2016-06-16 17:48:27 5140 2

原创 19. Remove Nth Node From End of List [easy] (Python)

题目链接https://leetcode.com/problems/remove-nth-node-from-end-of-list/题目原文 Given a linked list, remove the nth node from the end of list and return its head. For example, Given linked list: 1

2016-06-16 13:36:34 2853

原创 205. Isomorphic Strings [easy] (Python)

题目链接https://leetcode.com/problems/isomorphic-strings/题目原文 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.

2016-06-15 14:02:47 5653

原创 88. Merge Sorted Array [easy] (Python)

题目链接https://leetcode.com/problems/merge-sorted-array/题目原文 Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: You may assume that nums1 has enou

2016-06-15 13:54:39 7595 1

原创 223. Rectangle Area [easy] (Python)

题目链接https://leetcode.com/problems/rectangle-area/题目原文 Find the total area covered by two rectilinear rectangles in a 2D plane. Each rectangle is defined by its bottom left corner and top right c

2016-06-15 11:24:21 2624

原创 219. Contains Duplicate II [easy] (Python)

题目链接https://leetcode.com/problems/contains-duplicate-ii/题目原文 Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums

2016-06-14 19:59:14 3991

原创 160. Intersection of Two Linked Lists [easy] (Python)

题目链接https://leetcode.com/problems/intersection-of-two-linked-lists/题目原文 Write a program to find the node at which the intersection of two singly linked lists begins. For example, the foll

2016-06-08 21:23:41 4170

原创 225. Implement Stack using Queues [easy] (Python)

题目链接https://leetcode.com/problems/implement-stack-using-queues/题目原文 Implement the following operations of a stack using queues. 1. push(x) – Push element x onto stack. 2. pop() – Removes

2016-06-07 16:57:33 3488

原创 36. Valid Sudoku [easy] (Python)

题目链接https://leetcode.com/problems/valid-sudoku/题目原文 Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially filled, where empty cells are fi

2016-06-06 16:35:20 4775 3

原创 112. Path Sum [easy] (Python)

题目链接https://leetcode.com/problems/path-sum/题目原文 Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.

2016-06-06 15:28:13 3814

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