http://www.geeksforgeeks.org/array-rotation/ O(n), O(1) #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> #include <map> using…

  As usual Babul is again back with his problem and now with numbers. He thought of an array of numbers in which he does two types of operation that is rotation and deletion. His process of doing these 2 operations are that he first rotates the array…

As usual Babul is again back with his problem and now with numbers. He thought of an array of numbers in which he does two types of operation that is rotation and deletion. His process of doing these 2 operations are that he first rotates the array i…

To master any programming languages, you need to definitely solve/practice the below-listed problems. These problems range from easy to advanced difficulty level. I have collected these questions from various websites. For solutions refer this - http…

http://www.practice.geeksforgeeks.org/problem-page.php?pid=380 Largest Number formed from an Array Given a list of non negative integers, arrange them in such a manner that they form the largest number possible. The result is going to be very large,…

http://www.practice.geeksforgeeks.org/problem-page.php?pid=493 Sorting Elements of an Array by Frequency Given an array of integers, sort the array according to frequency of elements. For example, if the input array is {2, 3, 2, 4, 5, 12, 2, 3, 3, 3,…

Count the number of occurrences in a sorted array Given a sorted array arr[] and a number x, write a function that counts the occurrences of x in arr[]. Expected time complexity is O(Logn) Examples: Input: arr[] = {1, 1, 2, 2, 2, 2, 3,}, x = 2 Output…

A suffix array is a sorted array of all suffixes of a given string. The definition is similar to Suffix Tree which is compressed trie of all suffixes of the given text. Any suffix tree based algorithm can be replaced with an algorithm that uses a suf…

最坏,平均和最佳运行时间(Worst, Average and Best Cases) 在上一篇文章中,我们讨论到了渐进分析可以解决分析算法的问题,那么在这一篇中,我们用线性搜索来举例说明一下如何用渐进分析法来分析算法的性能. 我们从三个方面分析算法: 1.最坏情况 2.平均情况 3.最佳情况 这是一段很简单的线性查找的代码 从arr[] 中查找x // Linearly search x in arr[]. If x is present then return the index, // o…

[题目] 把一个数组最开始的若干个元素搬到数组的末尾,我们称之为数组的旋转.输入一个排好序的数组的一个旋转,输出旋转数组的最小元素.例如数组{3, 4, 5, 1, 2}为{1, 2, 3, 4, 5}的一个旋转,该数组的最小值为1. [分析] 这道题最直观的解法并不难.从头到尾遍历数组一次,就能找出最小的元素,时间复杂度显然是O(N).但这个思路没有利用输入数组的特性,我们应该能找到更好的解法. 我们容易想到二分查找,其时间复杂度为O(logn).这个问题是否可以运用二分查找呢?答案是肯定的.…

Suppose a sorted array 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). You are given a target value to search. If found in the array return its index, otherwise return -1. You may assume no duplic…

http://www.geeksforgeeks.org/bottom-view-binary-tree/ Bottom View of a Binary Tree Given a Binary Tree, we need to print the bottom view from left to right. A node x is there in output if x is the bottommost node at its horizontal distance. Horizonta…

http://www.practice.geeksforgeeks.org/problem-page.php?pid=387 Find sum of different corresponding bits for all pairs We define f (X, Y) as number of different corresponding bits in binary representation of X and Y. For example, f (2, 7) = 2, since b…

http://www.practice.geeksforgeeks.org/problem-page.php?pid=166 Minimum sum partition Given an array, the task is to divide it into two sets S1 and S2 such that the absolute difference between their sums is minimum. Input: The first line contains an i…

http://www.practice.geeksforgeeks.org/problem-page.php?pid=91 Minimum Points To Reach Destination Given a grid with each cell consisting of positive, negative or no points i.e, zero points. We can move across a cell only if we have positive points (…

http://www.practice.geeksforgeeks.org/problem-page.php?pid=129 Maximum Index Given an array A of integers, find the maximum of j - i subjected to the constraint of A[i] <= A[j]. Example : A : [3 5 4 2] Output : 2  for the pair (3, 4) Input: The first…

http://www.practice.geeksforgeeks.org/problem-page.php?pid=667 Equal to product Given an array of integers check whether there are two numbers present with given product. Input: The first line of input contains an integer T denoting the number of tes…

Both Arrays and Linked List can be used to store linear data of similar types, but they both have some advantages and disadvantages over each other. Following are the points in favour of Linked Lists. (1) The size of the arrays is fixed: So we must k…

Access: Random / Sequential 1. Array element can be randomly accessed using index 2. Random access for element of linked list costs O(n) time 3. Generally, in linked list, elements are accessed sequentially Memory Structure 1. Elements of array is st…

(referrence: GeeksforGeeks, Kth Largest Element in Array) This is a common algorithm problem appearing in interviews. There are four basic solutions. Solution 1 -- Sort First A Simple Solution is to sort the given array using a O(n log n) sorting alg…

前面一章介绍了BST的结构和一些简单的基本功能,例如:insert,findMin,nextLarger等等.这一节主要讲解一些BST的delete node操作还有BST的height的分析以及一些潜在的问题.即本节主要包括以下2个部分: 1,Analysis of deletion 2,Tree height analysis 一:Node deletion delete node的过程是需要依靠前一章的知识,需要了解nextLarger的过程和含义.然后在此基础之上,我们可以将删除node…

Given an array of n integers and q queries. Write a program to print floor value of mean in range l to r for each query in a new line. Examples: Input : arr[] = {1, 2, 3, 4, 5} q = 3 0 2 1 3 0 4 Output : 2 3 3 Here for 0 to 2 (1 + 2 + 3) / 3 = 2 Inpu…

Given an array A, we may rotate it by a non-negative integer K so that the array becomes A[K], A[K+1], A{K+2], ... A[A.length - 1], A[0], A[1], ..., A[K-1].  Afterward, any entries that are less than or equal to their index are worth 1 point. For exa…

Given an array A, we may rotate it by a non-negative integer K so that the array becomes A[K], A[K+1], A{K+2], ... A[A.length - 1], A[0], A[1], ..., A[K-1].  Afterward, any entries that are less than or equal to their index are worth 1 point. For exa…

Overview 知识点: 1. delete函数的signature public AVLTreeNode Delete(AVLTreeNode node, int key) 2. 算法,如何删除节点: // 如果左右节点都为空,node = null // 如果一个为空,另一个字节点不为空,把node节点替换成不为空的字节点 // 如果两个节点都不为空,则要找到中序后继节点,然后去其值,再递归删掉右侧子树的后继节点 3. 旋转: 左旋和右旋逻辑和插入是一致的. Source Code pri…

Given an array A, we may rotate it by a non-negative integer K so that the array becomes A[K], A[K+1], A{K+2], ... A[A.length - 1], A[0], A[1], ..., A[K-1]. Afterward, any entries that are less than or equal to their index are worth 1 point. For exam…

在这个案例中: 1. datetime.datetime.strptime(data, '%Y-%m-%d') # 由字符串格式转换为日期格式 2. pd.get_dummies(features)  # 将数据中的文字标签转换为one-hot编码形式,增加了特征的列数 3. rf.feature_importances 探究了随机森林样本特征的重要性,对其进行排序后条形图 4.fig.autofmt_xdate(rotation=60)  # 对图中的X轴标签进行60的翻转 代码: 第一步:数…

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]). You are given a target value to search. If found in the array return its index, otherwise return -1.…

ArrayList to Array Conversion in Java Following methods can be used for converting ArrayList to Array 方法 1: 使用 public Object[] toArray() 方法 import java.util.ArrayList; import java.util.List; public class Test { public static void main(String[] args)…

Array *532. K-diff Pairs in an Array 方案一:暴力搜索, N平方的时间复杂度,空间复杂度N 数组长度为10000,使用O(N平方)的解法担心TLE,不建议使用,尽管最终验证还是可以过. 方案二:哈希 时间复杂度N 空间复杂度N *1.two sum 思路: 使用hash, 顺序遍历数组,并记录每一个出现过的元素值和其下标,当遍历到当前元素时,查找target-当前元素值 是否出现在map中,存在则返回结果 *16. 3Sum Closest 思路一:暴力 fo…