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Programming Articles
Page 1348 of 2547
Super Palindromes in C++
Suppose we have a positive integer N, that is said to be a superpalindrome if it is a palindrome, and it is also the square of a palindrome. Now consider we have two positive integers L and R we have to find the number of superpalindromes in the inclusive range of [L, R].So, if the input is like L = 5 and R = 500, then the output will be 3, the superpalindromes are 9, 121, 484.To solve this, we will follow these steps −Define a function helper(), this will take x, m, M, lb, ub, if x > ub, ...
Read MoreIs an array a primitive type or an object in Java?
Array is considered to be an object in Java. The reason behind this is that an array can be created using the ‘new’ keyword. The ‘new’ keyword/operator is always used to create an object. This is how an array is perceived as an object.The direct parent class or super class of any array is the ‘Object’ class. Every array type in Java belongs to a certain class. This indicates that there are explicit classes for integer array types, float array types, double array types, and so on.Arrays can be dynamically created, and be assigned variables as well.Let us see an ...
Read MoreNumber of Music Playlists in C++
Suppose we have a music player, that contains N different songs and we want to listen to L songs during our trip. So we have to make a playlist so that it meets these conditions −Every song is played at least onceA song can only be played again only if K other songs have been played.We have to find the number of possible playlists. The answer can be very large, so we will return it modulo 10^9 + 7.So, if the input is like N = 2, L = 3, K = 0, then the output will be 6, as ...
Read MoreConstruct the Rectangle in C++
Suppose we have a specific rectangular web page area, our job is to design a rectangular web page, whose length L and width W that satisfies the following requirements −The area of the web page must equal to the given target area.The width W should not be larger than the length L, and L >= W.The difference between L and W should be as small as possible.So, if the input is like 4, then the output will be [2, 2], as the target area is 4, and all the possible ways to construct it are [1, 4], [2, 2], [4, ...
Read MoreThree Equal Parts in C++
Suppose we have one array A of 0s and 1s, we have to divide the array into 3 non-empty parts such that all of these parts represent the same binary value. If that is possible, return any [i, j] with i+1 < j, such that −A[0], A[1], ..., A[i] is the first part;A[i+1], A[i+2], ..., A[j-1] is the second part, andA[j], A[j+1], ..., A[A.length - 1] is the third part.All three parts have equal binary value. If that is not possible, return [-1, -1].So, if the input is like [0, 1, 0, 1, 1], then the output will be [0, ...
Read MoreKeyboard Row in C++
Given a list of words, we have to find those words that can be typed using letters of the alphabet on only one row's of standard keyboard layout.So, if the input is like ["hello", "world", "mom", "dad", "try", "type", "tom"], then the output will be ["dad", "try", "type"]To solve this, we will follow these steps −Define an array outputoneRow := trueDefine one map charToRowMap, this will take all pairs such that {letter, line}, the letter is the letter present on the keyboard, and line is the line number on the keyboard.for each word in words array −if the word is ...
Read MoreDistinct Subsequences II in C++
Suppose we have a string S, we have to count the number of distinct subsequences of S. The result can be large, so we will return the answer modulo 10^9 + 7.So, if the input is like "bab", then the output will be 6, as there are 6 different sequences, these are "a", "b, "ba", "ab", "bb", "abb".To solve this, we will follow these steps −Define a function add(), this will take a, b, return ((a mod MOD) + (b mod MOD)) mod MODDefine a function sub(), this will take a, b, return (((a mod MOD) - (b mod MOD)) ...
Read MoreIsland of Isolation in Java
After an object has been used, it is deallocated from the memory using the Garbage Collector class. The objects are destroyed based on the fact that no reference to that object is present. The Garbage Collector class calls the ‘finalize’ function on the object that needs to be destroyed.What is island of isolation?When two objects ‘a’, and ‘b’ reference each other, and they are not referenced by any other object, it is known as island of isolation.It is a group of objects which reference each other but they are not referenced but other objects of other applications at all.Note − ...
Read MoreFind the Shortest Superstring in C++
Suppose we have an array A of strings, we have to find any smallest string that contains each string in A as a substring. We can also assume that no string in A is substring of another string in A.So, if the input is like ["dbsh", "dsbbhs", "hdsb", "ssdb", "bshdbsd"], then the output will be "hdsbbhssdbshdbsd"To solve this, we will follow these steps −Define a function calc(), this will take a, b, for initialize i := 0, when i < size of a, update (increase i by 1), do −if substring of a from index i to end is at ...
Read MoreRelative Ranks in C++
Suppose we have a list of scores of N athletes, we have to find their relative ranks and the people with the top three highest scores, who will be different medals: "Gold", "Silver" and "Bronze".So, if the input is like [2, 5, 3, 1, 0], then the output will be [Bronze, Gold, Silver, 4, 5]To solve this, we will follow these steps −if size of nums is same as 1, then −return "Gold"if size of nums is same as 2, then −if nums[0] > nums[1], then −return "Gold", "Silver"Otherwisereturn "Silver", "Gold"Define an array vDDefine an array vecfor initialize i := ...
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