Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Suppose we have N bulbs in a row and they are numbered from 1 to N. At first, all the bulbs are off. We can turn on exactly one bulb everyday until all bulbs are on after N days. If we have an array bulbs of length N where bulbs[i] = x this indicates that on the (i+1)th day, we will turn on the bulb at position x. If we have another integer K, such that out the minimum day number such that there exists two turned on bulbs that have exactly K bulbs between them that are all off. ... Read More
Suppose we have an integer n, we have to return nth integer after following this operation: Start from integer 1, remove any integer that contains 9 such as 9, 19, 29... So now, we will have a new integer sequence like 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, ... We have to keep in mind that 1 will be the first integer.So, if the input is like 9, then the output will be 10To solve this, we will follow these steps −ret := 0s := 1while n is non-zero, do −ret := ret + (n mod 9) ... Read More
The lambda expression is an inline code that can implement a functional interface without creating an anonymous class. An ArrayList can be used to store a dynamically sized collection of elements.In the below program, We have removed the elements of an ArrayList whose age is less than or equal to 20 using the removeIf() method. This method introduced in Java 8 version to remove all elements from a collection that satisfy a condition.Syntaxpublic boolean removeIf(Predicate filter) The parameter filter is a Predicate. If the given predicate satisfies the condition, the element can be removed. This method returns the boolean value true if elements are removed, false otherwise.Exampleimport java.util.*; ... Read More
Suppose we have an array A (index starts at 1) with N numbers: A1, A2, ..., AN and another integer B. The integer B denotes that from any index is i in the array A, we can jump to any one of the places in the array A indexed i+1, i+2, …, i+B if this place can be jumped to. Also, if we step on the index i, we have to pay Ai amount of coins. If Ai is -1, it means we can’t jump to the place indexed i in the array.Now, when we start from the place indexed ... Read More
Suppose we have an array with n integers, we have to find the contiguous subarray whose length is greater than or equal to k that has the maximum average value. We have to find the maximum average value.So, if the input is like [1, 12, -5, -6, 50, 3], k = 4, then the output will be 12.75, as when length is 5, maximum average value is 10.8, when length is 6, maximum average value is 9.16667. Thus output is 12.75.To solve this, we will follow these steps −Define a function ok(), this will take x, an array nums, k, ... Read More
Suppose one company wants to give one of its best employees the option to travel among N cities to collect some resources. But employees want some vacations also, we could take vacations in some particular cities and weeks. Our task is to schedule the traveling to maximize the number of vacation days we could take, but there are certain rules and restrictions we have to follow.We can only travel among N cities; they are represented by indexes from 0 to N-1. Firstly, we are in the city indexed 0 on Monday.These cities are connected by flights. We have one N ... Read More
In this article, we will learn about the solution to the problem statement given below.Problem statement − We are given a string input, we need to convert it into dictionary typeHere we will discuss two methods to solve the problem without using a built-in dict() function.Method 1 − Using eval() methodEval method is used only when the syntax or the formation of string resembles that of a dictionary. Direct conversion of string to the dictionary can happen in that case as discussed below.Example Live Demo# String string = "{'T':1, 'U':2, 'T':3, 'O':4, 'R':5}" # eval() function dict_string = eval(string) print(dict_string) print(dict_string['T']) print(dict_string['T'])Output{'T': ... Read More
In this article, we will learn about the solution to the problem statement given below.Problem statement − We are given a string, we need to find the occurrence of each character in a given string.Here we will be discussing 3 approaches as discussed below:LApproach 1 − The brute-force approachExample Live Demotest_str = "Tutorialspoint" #count dictionary count_dict = {} for i in test_str: #for existing characters in the dictionary if i in count_dict: count_dict[i] += 1 #for new characters to be added else: count_dict[i] = 1 print ("Count of all characters in Tutorialspoint ... Read More
In this article, we will learn about the solution to the problem statement given below.Problem statement − We are given a list, we need to display the second largest number in a list.There are three approaches to solve the problem−Approach 1 − We use the set() function & remove() functionExample Live Demolist1 = [11, 22, 1, 2, 5, 67, 21, 32] # to get unique elements new_list = set(list1) # removing the largest element from list1 new_list.remove(max(new_list)) # now computing the max element by built-in method? print(max(new_list))Output32Approach 2 − We use sort() method and negative indexesExample Live Demolist1 = [11, 22, 1, 2, ... Read More
In this article, we will learn about the solution to the problem statement given below.Problem statement − We are given two integers, we need to print the second maximum value in the dictionaryNow let’s observe the concept in the implementation below−Approach 1 − Using sorted() function by negative indexesExample Live Demo#input example_dict ={"tutor":3, "tutorials":15, "point":9, "tutorialspoint":19} # sorting the given list and get the second last element print(list(sorted(example_dict.values()))[-2])Output15Approach 2 − Here we use sort method on the list and then access the second largest elementExample Live Demolist1 = [11, 22, 1, 2, 5, 67, 21, 32] # using built-in sort method list1.sort() # ... Read More